[HISTORY: Adopted by the Common Council of the City of Waterloo 7-2-2009 by Ord. No. 2009-11. Amendments noted where applicable.]
This chapter is adopted by the City Council under the authority granted by § 62.234., Wis. Stats. This chapter supersedes all provisions of an ordinance previously enacted under § 62.23, Wis. Stats., that relate to stormwater management regulations. Except as otherwise specified in § 62.234, Wis. Stats., § 62.23, Wis. Stats., applies to this chapter and to any amendments to this chapter.
The provisions of this chapter are deemed not to limit any other lawful regulatory powers of the same governing body.
The City Council hereby designates the City Engineer to administer and enforce the provisions of this chapter.
The requirements of this chapter do not preempt more stringent stormwater management requirements that may be imposed by any of the following:
Wisconsin Department of Natural Resources administrative rules, permits or approvals, including those authorized under §§ 281.16 and 283.33, Wis. Stats.
Targeted nonagricultural performance standards promulgated in rules by the Wisconsin Department of Natural Resources under Section NR 151.004, Wis. Adm. Code.
The Common Council finds that uncontrolled postconstruction runoff has a significant impact upon water resources and the health, safety and general welfare of the community and diminishes the public enjoyment and use of natural resources. Specifically, uncontrolled postconstruction runoff can:
Degrade physical stream habitat by increasing stream bank erosion, increasing streambed scour, diminishing groundwater recharge, diminishing stream base flows and increasing stream temperature.
Diminish the capacity of lakes and streams to support fish, aquatic life, recreational and water supply uses by increasing pollutant loading of sediment, suspended solids, nutrients, heavy metals, bacteria, pathogens and other urban pollutants.
Alter wetland communities by changing wetland hydrology and by increasing pollutant loads.
Reduce the quality of groundwater by increasing pollutant loading.
Threaten public health, safety, property and general welfare by overtaxing storm sewers, drainageways and other minor drainage facilities.
Threaten public health, safety, property and general welfare by increasing major flood peaks and volumes.
Undermine floodplain management efforts by increasing the incidence and levels of flooding.
Purpose. The general purpose of this chapter is to establish long-term, postconstruction runoff management requirements that will diminish the threats to public health, safety, welfare and the aquatic environment. Specific purposes are to:
Further the maintenance of safe and healthful conditions.
Prevent and control the adverse effects of stormwater runoff; prevent and control soil erosion; prevent and control water pollution; protect spawning grounds, fish and aquatic life; control building sites, placement of structures and land uses; preserve ground cover and scenic beauty; and promote sound economic growth.
Control exceedance of the safe capacity of existing drainage facilities and receiving water bodies; prevent undue channel erosion; control increases in the scouring and transportation of particulate matter; and prevent conditions that endanger downstream property.
Intent. It is the intent of the Common Council that this chapter regulates postconstruction stormwater discharges to waters of the state. This chapter may be applied on a site-by-site basis. The Common Council recognizes, however, that the preferred method of achieving the stormwater performance standards set forth in this chapter is through the preparation and implementation of comprehensive, systems-level stormwater management plans that cover hydrologic units, such as watersheds, on a municipal and regional scale. Such plans may prescribe regional stormwater devices, practices or systems, any of which may be designed to treat runoff from more than one site prior to discharge to waters of the state. Where such plans are in conformance with the performance standards developed under § 281.16, Wis. Stats., for regional stormwater management measures and have been approved by the Common Council, it is the intent of this chapter that the approved plan be used to identify postconstruction management measures acceptable for the community.
Where not otherwise limited by law, this chapter applies after final stabilization to a site of land-disturbing construction activity meeting any of the criteria in this paragraph, unless the site is otherwise exempt under Subsection A(2):
A postdevelopment construction site that had one or more acres of land-disturbing construction activity.
A site that meets any of the criteria in this paragraph is exempt from the requirements of this chapter:
A redevelopment postconstruction site with no increase in exposed parking lots or roads.
A postconstruction site with less than 10% connected imperviousness based on complete development of the postconstruction site, provided that the cumulative area of all parking lots and rooftops is less than one acre.
Nonpoint discharges from agricultural facilities and practices.
Nonpoint discharges from silviculture activities.
Routine maintenance for project sites under five acres of land disturbance if performed to maintain the original line and grade, hydraulic capacity or original purpose of the facility.
Underground utility construction such as water, sewer and fiber optic lines. This exemption does not apply to the construction of any aboveground structures associated with utility construction.
Notwithstanding the applicability requirements in Subsection A(1), this chapter applies to postconstruction sites of any size that, in the opinion of the administrating authority, are likely to result in runoff that exceeds the safe capacity of the existing drainage facilities or receiving body of water, that causes undue channel erosion, that increases water pollution by scouring or the transportation of particulate matter or that endangers property or public safety.
Jurisdiction. This chapter applies to postconstruction sites within the boundaries and jurisdiction of the City of Waterloo.
Exclusions. This chapter is not applicable to activities conducted by a state agency, as defined under § 227.01(1), Wis. Stats., but also including the office of district attorney, which is subject to the state plan promulgated or a memorandum of understanding entered into under § 281.33(2), Wis. Stats.
As used in this chapter, the following terms shall have the meanings indicated:
- ADMINISTERING AUTHORITY
- A governmental employee, or a regional planning commission empowered under § 59.693, 60.627, 61.354 or 62.234, Wis. Stats., that is designated by the Common Council to administer this chapter.
- AGRICULTURAL FACILITIES AND PRACTICES
- Has the meaning given in § 281.16, Wis. Stats.
- AVERAGE ANNUAL RAINFALL
- A calendar year of precipitation, excluding snow, which is considered typical.
- BEST MANAGEMENT PRACTICE or BMP
- Structural or nonstructural measures, practices, techniques or devices employed to avoid or minimize sediment or pollutants carried in runoff to waters of the state.
- BUSINESS DAY
- A day the office of the Common Council is routinely and customarily open for business.
- CEASE-AND-DESIST ORDER
- A court-issued order to halt land-disturbing construction activity that is being conducted without the required permit.
- COMBINED SEWER SYSTEM
- A system for conveying both sanitary sewage and stormwater runoff.
- CONNECTED IMPERVIOUSNESS
- An impervious surface that is directly connected to a separate storm sewer or water of the state via an impervious flow path.
- DESIGN STORM
- A hypothetical discrete rainstorm characterized by a specific duration, temporal distribution, rainfall intensity, return frequency and total depth of rainfall.
- Residential, commercial, industrial or institutional land uses and associated roads.
- DIVISION OF LAND
- The creation from one parcel of three or more parcels or building sites of 0.5 or fewer acres each in area where such creation occurs at one time or through the successive partition within a five-year period.
- EFFECTIVE INFILTRATION AREA
- The area of the infiltration system that is used to infiltrate runoff and does not include the area used for site access, berms or pretreatment.
- The process by which the land's surface is worn away by the action of wind, water, ice or gravity.
- EXCEPTIONAL RESOURCE WATERS
- Waters listed in Section NR 102.11, Wis. Adm. Code.
- The unincorporated area within three miles of the corporate limits of a first- , second- or third-class city, or within 1.5 miles of a fourth-class city or village.
- FINAL STABILIZATION
- That all land-disturbing construction activities at the construction site have been completed and that a uniform, perennial vegetative cover has been established, with a density of at least 70% of the cover, for the unpaved areas and areas not covered by permanent structures, or employment of equivalent permanent stabilization measures.
- FINANCIAL GUARANTEE
- A performance bond, maintenance bond, surety bond, irrevocable letter of credit or similar guarantees submitted to the City of Waterloo by the responsible party to assure that requirements of this chapter are carried out in compliance with the stormwater management plan.
- GOVERNING BODY
- City Council.
- IMPERVIOUS SURFACE
- An area that releases as runoff all or a large portion of the precipitation that falls on it, except for frozen soil. Rooftops, sidewalks, driveways, parking lots and streets are examples of areas that typically are impervious.
- INFILL AREA
- An undeveloped area of land located within existing development.
- The entry of precipitation or runoff into or through the soil.
- INFILTRATION SYSTEM
- A device or practice such as a basin, trench, rain garden or swale designed specifically to encourage infiltration, but does not include natural infiltration in pervious surfaces such as lawns, redirecting of rooftop downspouts onto lawns or minimal infiltration from practices, such as swales or roadside channels designed for conveyance and pollutant removal only.
- KARST FEATURE
- An area or surficial geologic feature subject to bedrock dissolution so that it is likely to provide a conduit to groundwater, and may include caves, enlarged fractures, mine features, exposed bedrock surfaces, sinkholes, springs, seeps or swallets.
- LAND-DISTURBING CONSTRUCTION ACTIVITY
- Any man-made alteration of the land surface resulting in a change in the topography or existing vegetative or nonvegetative soil cover, that may result in runoff and lead to an increase in soil erosion and movement of sediment into waters of the state. Land-disturbing construction activity includes clearing and grubbing, demolition, excavating, pit trench dewatering, filling and grading activities.
- MAINTENANCE AGREEMENT
- A legal document that provides for long-term maintenance of stormwater management practices.
- MAXIMUM EXTENT PRACTICABLE or MEP
- A level of implementing best management practices in order to achieve a performance standard specified in this chapter which takes into account the best available technology, cost effectiveness and other competing issues such as human safety and welfare, endangered and threatened resources, historic properties and geographic features. MEP allows flexibility in the way to meet the performance standards and may vary based on the performance standard and site conditions.
- NEW DEVELOPMENT
- Development resulting from the conversion of previously undeveloped land or agricultural land uses.
- Located outside the property boundary described in the permit application.
- Located within the property boundary described in the permit application.
- ORDINARY HIGH-WATER MARK
- Has the meaning given in Section NR 115.03(6), Wis. Adm. Code.
- OUTSTANDING RESOURCE WATERS
- Waters listed in Section NR 102.10, Wis. Adm. Code.
- PERCENT FINES
- The percentage of a given sample of soil, which passes through a #200 sieve.
- PERFORMANCE STANDARD
- A narrative or measurable number specifying the minimum acceptable outcome for a facility or practice.
- A written authorization made by the administering authority to the applicant to conduct land-disturbing construction activity or to discharge postconstruction runoff to waters of the state.
- PERMIT ADMINISTRATION FEE
- A sum of money paid to the administering authority by the permit applicant for the purpose of recouping the expenses incurred by the authority in administering the permit.
- PERVIOUS SURFACE
- An area that releases as runoff a small portion of the precipitation that falls on it. Lawns, gardens, parks, forests or other similar vegetated areas are examples of surfaces that typically are pervious.
- Has the meaning given in § 283.01(13), Wis. Stats.
- Has the meaning given in § 281.01(10), Wis. Stats.
- POSTCONSTRUCTION SITE
- A construction site following the completion of land-disturbing construction activity and final site stabilization.
- PREDEVELOPMENT CONDITION
- The extent and distribution of land cover types present before the initiation of land-disturbing construction activity, assuming that all land uses prior to development activity are managed in an environmentally sound manner.
- PREVENTIVE ACTION LIMIT
- Has the meaning given in Section NR 140.05(17), Wis. Adm. Code.
- Areas where development is replacing older development.
- RESPONSIBLE PARTY
- Any entity holding fee title to the property or other person contracted or obligated by other agreement to implement and maintain postconstruction stormwater BMPs.
- Stormwater or precipitation, including rain, snow or ice melt or similar water, that moves on the land surface via sheet or channelized flow.
- SEPARATE STORM SEWER
- A conveyance or system of conveyances including roads with drainage systems, streets, catch basins, curbs, gutters, ditches, constructed channels or storm drains, which meets all of the following criteria:
- The entire area included in the legal description of the land on which the land-disturbing construction activity occurred.
- STOP-WORK ORDER
- An order issued by the administering authority which requires that all construction activity on the site be stopped.
- STORMWATER MANAGEMENT PLAN
- A comprehensive plan designed to reduce the discharge of pollutants from stormwater after the site has undergone final stabilization following completion of the construction activity.
- STORMWATER MANAGEMENT SYSTEM PLAN
- A comprehensive plan designed to reduce the discharge of runoff and pollutants from hydrologic units on a regional or municipal scale.
- TECHNICAL STANDARD
- A document that specifies design, predicted performance and operation and maintenance specifications for a material, device or method.
- TOP OF THE CHANNEL
- An edge, or point on the landscape, landward from the ordinary high-water mark of a surface water of the state, where the slope of the land begins to be less than 12% continually for at least 50 feet. If the slope of the land is 12% or less continually for the initial 50 feet, landward from the ordinary high-water mark, the top of the channel is the ordinary high-water mark.
- The United States Department of Agriculture, Natural Resources Conservation Service (previously Soil Conservation Service), Urban Hydrology for Small Watersheds, Second Edition, Technical Release 55, June 1986.
- TYPE II DISTRIBUTION
- A rainfall type curve as established in the United States Department of Agriculture, Soil Conservation Service, Technical Paper 149, published 1973. The Type II curve is applicable to all of Wisconsin and represents the most intense storm pattern.
- WATERS OF THE STATE
- Has the meaning given in § 281.01(18), Wis. Stats.
The following methods shall be used in designing the water quality, peak flow shaving and infiltration components of stormwater practices needed to meet the water quality standards of this chapter:
Technical standards identified, developed or disseminated by the Wisconsin Department of Natural Resources under Subchapter V of Chapter NR 151, Wis. Adm. Code.
Where technical standards have not been identified or developed by the Wisconsin Department of Natural Resources, other technical standards may be used, provided that the methods have been approved by the City Engineer.
In this chapter, the following year(s) and location(s) has been selected as average annual rainfall(s): 1981 (March 12 to December 2).
Responsible party. The responsible party shall implement a postconstruction stormwater management plan that incorporates the requirements of this section.
Plan. A written stormwater management plan in accordance with § 377-9 shall be developed and implemented for each postconstruction site, when deemed applicable.
Requirements. The plan required under Subsection B shall include the following:
Total suspended solids. BMPs shall be designed, installed and maintained to control total suspended solids carried in runoff from the postconstruction site as follows:
For new development, by design, reduce the total suspended solids load by 80%, based on the average annual rainfall, as compared to no runoff management controls. No person shall be required to exceed an eighty-percent total suspended solids reduction to meet the requirements of this subsection.
For redevelopment, by design, reduce the total suspended solids load by 40%, based on the average annual rainfall, as compared to no runoff management controls. No person shall be required to exceed a forty-percent total suspended solids reduction to meet the requirements of this subsection.
For infill development under five acres, by design, reduce the total suspended solids load by 40%, based on an average annual rainfall, as compared to no runoff management controls. No person shall be required to exceed a forty-percent total suspended solids reduction to meet the requirements of this subsection.
Notwithstanding Subsection C(1)(a) through (c), if the design cannot achieve the applicable total suspended solids reduction specified, the stormwater management plan shall include a written and site-specific explanation why that level of reduction is not attained and the total suspended solids load shall be reduced to the maximum extent practicable.
By design, BMPs shall be employed to maintain or reduce the peak runoff discharge rates, as compared to predevelopment conditions for the two- and ten-year twenty-four-hour design storm, and safely pass the one-hundred-year twenty-four-hour design storm applicable to postconstruction sites. Predevelopment conditions shall assume "good hydrologic conditions" for appropriate land covers as identified in TR-55 or an equivalent methodology. The meaning of "hydrologic soil group" and "runoff curve number" are as determined in TR-55. However, when predevelopment land cover is cropland, rather than using TR-55 values for cropland, the runoff curve numbers in Table 1 shall be used.
This subsection of the chapter does not apply to any of the following:
A postconstruction site where the change in hydrology due to development does not increase the existing surface water elevation at any point within the downstream receiving water by more than 0.01 of a foot for the two-year twenty-four-hour storm event.
A redevelopment postconstruction site.
An infill development area less than five acres.
Infiltration. BMPs shall be designed, installed and maintained to infiltrate runoff to the maximum extent practicable in accordance with the following, except as provided in Subsection C(3)(e) through (h).
For residential developments, one of the following shall be met:
Infiltrate sufficient runoff volume so that the postdevelopment infiltration volume shall be at least 90% of the predevelopment infiltration volume, based on an average annual rainfall. However, when designing appropriate infiltration systems to meet this requirement, no more than 1% of the project site is required as an effective infiltration area.
Infiltrate 25% of the postdevelopment runoff from the two-year, twenty-four-hour design storm with a Type II distribution. Separate curve numbers for pervious and impervious surfaces shall be used to calculate runoff volumes and not composite curve numbers as defined in TR-55. However, when designing appropriate infiltration systems to meet this requirement, no more than 1% of the project site is required as an effective infiltration area.
For nonresidential development, including commercial, industrial and institutional development, one of the following shall be met:
Infiltrate sufficient runoff volume so that the postdevelopment infiltration volume shall be at least 60% of the predevelopment infiltration volume, based on an average annual rainfall. However, when designing appropriate infiltration systems to meet this requirement, no more than 2% of the project site is required as an effective infiltration area.
Infiltrate 10% of the runoff from the two-year, twenty-four-hour design storm with a Type II distribution. Separate curve numbers for pervious and impervious surfaces shall be used to calculate runoff volumes, and not composite curve numbers as defined in TR-55. However, when designing appropriate infiltration systems to meet this requirement, no more than 2% of the project site is required as an effective infiltration area.
Before infiltrating runoff, pretreatment shall be required for parking lot runoff and for runoff from new road construction in commercial, industrial and institutional areas that will enter an infiltration system. The pretreatment shall be designed to protect the infiltration system from clogging prior to scheduled maintenance and to protect groundwater quality in accordance with Subsection C(3)(h). Pretreatment options may include but are not limited to oil/grease separation, sedimentation, biofiltration, filtration, swales or filter strips. Note: To achieve the infiltration requirement for the parking lots or roads, maximum extent practicable should not be interpreted to require significant topography changes that create an excessive financial burden. To minimize potential groundwater impacts, it is desirable to infiltrate the cleanest runoff. To achieve this, a design may propose greater infiltration of runoff from low pollutant sources such as roofs, and less from higher pollutant source areas such as parking lots.
The runoff from the following areas are prohibited from meeting the requirements of this paragraph:
Areas associated with Tier 1 industrial facilities identified in Section NR 216.21(2)(a), Wis. Adm. Code, including storage, loading, rooftop and parking.
Storage and loading areas of Tier 2 industrial facilities identified in Section NR 216.21(2)(b), Wis. Adm. Code. Note: Runoff from Tier 2 parking and rooftop areas may be infiltrated but may require pretreatment.
Fueling and vehicle maintenance areas.
Areas within 1,000 feet upgradient or within 100 feet downgradient of karst features.
Areas with less than three feet separation distance from the bottom of the infiltration system to the elevation of seasonal high groundwater or the top of bedrock, except this Subsection C(3)(e)[e] does not prohibit infiltration of roof runoff.
Areas with runoff from industrial, commercial and institutional parking lots and roads and residential arterial roads with less than five feet separation distance from the bottom of the infiltration system to the elevation of seasonal high groundwater or the top of bedrock.
Areas within 400 feet of a community water system well as specified in Section NR 811.16(4), Wis. Adm. Code, or within 100 feet of a private well as specified in Section NR 812.08(4), Wis. Adm. Code, for runoff infiltrated from commercial, industrial and institutional land uses or regional devices for residential development.
Areas where contaminants of concern, as defined in Section NR 720.03(2), Wis. Adm. Code, are present in the soil through which infiltration will occur.
Any area where the soil does not exhibit one of the following soil characteristics between the bottom of the infiltration system and the seasonal high groundwater and top of bedrock: at least a three-foot soil layer with 20% fines or greater; or at least a five-foot soil layer with 10% fines or greater. This does not apply where the soil medium within the infiltration system provides an equivalent level of protection. This Subsection C(3)(e)[i] does not prohibit infiltration of roof runoff.
Exemptions. The following are not required to meet the requirements of this paragraph:
Areas where the infiltration rate of the soil is less than 0.6 inch per hour measured at the site.
Parking areas and access roads less than 5,000 square feet for commercial and industrial development.
Redevelopment postconstruction sites.
Infill development areas less than five acres.
Infiltration areas during periods when the soil on the site is frozen.
Roads in commercial, industrial and institutional land uses, and arterial residential roads.
Where alternate uses of runoff are employed, such as for toilet flushing, laundry or irrigation, such alternate use shall be given equal credit toward the infiltration volume required by this paragraph.
Infiltration systems designed in accordance with this paragraph shall, to the extent technically and economically feasible, minimize the level of pollutants infiltrating to groundwater and shall maintain compliance with the preventive action limit at a point of standards application in accordance with Chapter NR 140, Wis. Adm. Code. However, if site-specific information indicates that compliance with a preventive action limit is not achievable, the infiltration BMP may not be installed or shall be modified to prevent infiltration to the maximum extent practicable.
"Protective area" means an area of land that commences at the top of the channel of lakes, streams and rivers, or at the delineated boundary of wetlands, and that is the greatest of the following widths, as measured horizontally from the top of the channel or delineated wetland boundary to the closest impervious surface. However, in this paragraph, "protective area" does not include any area of land adjacent to any stream enclosed within a pipe or culvert, such that runoff cannot enter the enclosure at this location.
For outstanding resource waters and exceptional resource waters, and for wetlands in areas of special natural resource interest as specified in Section NR 103.04: 75 feet.
For perennial and intermittent streams identified on a United States geological survey 7.5-minute series topographic map, or a county soil survey map, whichever is more current: 50 feet.
For lakes: 50 feet.
For highly susceptible wetlands: 50 feet. Highly susceptible wetlands include the following types: fens, sedge meadows, bogs, low prairies, conifer swamps, shrub swamps, other forested wetlands, fresh wet meadows, shallow marshes, deep marshes and seasonally flooded basins. Wetland boundary delineations shall be made in accordance with Section NR 103.08(1m). This paragraph does not apply to wetlands that have been completely filled in accordance with all applicable state and federal regulations. The protective area for wetlands that have been partially filled in accordance with all applicable state and federal regulations shall be measured from the wetland boundary delineation after fill has been placed.
For less susceptible wetlands: 10% of the average wetland width, but no less than 10 feet nor more than 30 feet. Less susceptible wetlands include degraded wetlands dominated by invasive species such as reed canary grass.
For concentrated flow channels with drainage areas greater than 130 acres: 10 feet.
This paragraph applies to postconstruction sites located within a protective area, except those areas exempted pursuant to Subsection C(4)(d).
The following requirements shall be met:
Impervious surfaces shall be kept out of the protective area to the maximum extent practicable. The stormwater management plan shall contain a written site-specific explanation for any parts of the protective area that are disturbed during construction.
Where land-disturbing construction activity occurs within a protective area, and where no impervious surface is present, adequate sod or self-sustaining vegetative cover of 70% or greater shall be established and maintained. The adequate sod or self-sustaining vegetative cover shall be sufficient to provide for bank stability, maintenance of fish habitat and filtering of pollutants from upslope overland flow areas under sheet flow conditions. Nonvegetative materials, such as rock riprap, may be employed on the bank as necessary to prevent erosion, such as on steep slopes or where high-velocity flows occur. Note: It is recommended that seeding of nonaggressive vegetative cover be used in the protective areas. Vegetation that is flood- and drought-tolerant and can provide long-term bank stability because of an extensive root system is preferable. Vegetative cover can be measured using the line transect method described in the University of Wisconsin Extension publication number A3533, titled "Estimating Residue Using the Line Transect Method."
Best management practices such as filter strips, swales or wet detention basins, that are designed to control pollutants from nonpoint sources, may be located in the protective area. Note: Other regulations, such as Chapter 30, Wis. Stats., and Chapters NR 103, 115, 116 and 117, Wis. Adm. Code, and their associated review and approval process may apply in the protective area.
This paragraph does not apply to:
Redevelopment postconstruction sites.
Infill development areas less than five acres.
Structures that cross or access surface waters, such as boat landings, bridges and culverts.
Structures constructed in accordance with Section 59.692(1v), Wis. Stats.
Postconstruction sites from which runoff does not enter the surface water, except to the extent that vegetative ground cover is necessary to maintain bank stability. Note: A vegetated protective area to filter runoff pollutants from postconstruction sites described in Subsection C(4)(d) is not necessary since runoff is not entering the surface water at that location. Other practices, necessary to meet the requirements of this section, such as a swale or basin, will need to be designed and implemented to reduce runoff pollutants before the runoff enters a surface water of the state.
Fueling and vehicle maintenance areas. Fueling and vehicle maintenance areas shall, to the maximum extent practicable, have BMPs designed, installed and maintained to reduce petroleum within runoff, such that the runoff that enters waters of the state contains no visible petroleum sheen. Note: A combination of the following BMPs may be used: oil and grease separators, canopies, petroleum spill cleanup materials, or any other structural or nonstructural method of preventing or treating petroleum in runoff.
General considerations for on-site and off-site stormwater management measures. The following considerations shall be observed in managing runoff:
Natural topography and land cover features such as natural swales, natural depressions, native soil-infiltrating capacity and natural groundwater recharge areas shall be preserved and used, to the extent possible, to meet the requirements of this section.
Emergency overland flow for all stormwater facilities shall be provided to prevent exceeding the safe capacity of downstream drainage facilities and prevent endangerment of downstream property or public safety.
Location and regional treatment option.
The BMPs may be located on site or off site as part of a regional stormwater device, practice or system.
Postconstruction runoff within a non-navigable surface water that flows into a BMP, such as a wet detention pond, is not required to meet the performance standards of this chapter. Postconstruction BMPs may be located in non-navigable surface waters.
Except as allowed under Subsection E(4), postconstruction runoff from new development shall meet the postconstruction performance standards prior to entering a navigable surface water.
Postconstruction runoff from any development within a navigable surface water that flows into a BMP is not required to meet the performance standards of this chapter if:
Runoff from existing development, redevelopment and infill areas shall meet the postconstruction performance standards in accordance with this paragraph.
To the maximum extent practicable, BMPs shall be located to treat runoff prior to discharge to navigable surface waters.
Postconstruction BMPs for such runoff may be located in a navigable surface water if allowable under all other applicable federal, state and local regulations such as Chapter NR 103, Wis. Adm. Code, and Chapter 30, Wis. Stats. Note: This allows the location of BMPs in navigable surface waters where necessary to augment management practices upstream of the navigable surface water to meet the performance standards.
The discharge of runoff from a BMP, such as a wet detention pond, or after a series of such BMPs is subject to this chapter. Note: This section does not supersede any other applicable federal, state or local regulation such as Chapter NR 103, Wis. Adm. Code, and Chapter 30, Wis. Stats.
The City Engineer may approve off-site management measures, provided that all of the following conditions are met:
The City Engineer determines that the postconstruction runoff is covered by a stormwater management system plan that is approved by the City of Waterloo and that contains management requirements consistent with the purpose and intent of this chapter.
The off-site facility meets all of the following conditions:
The facility is in place.
The facility is designed and adequately sized to provide a level of stormwater control equal to or greater than that which would be afforded by on-site practices meeting the performance standards of this chapter.
The facility has a legally obligated entity responsible for its long-term operation and maintenance.
Where a regional treatment option exists such that the City Engineer exempts the applicant from all or part of the minimum on-site stormwater management requirements, the applicant shall be required to pay a fee in an amount determined in negotiation with the Common Council. In determining the fee for postconstruction runoff, the City Engineer shall consider an equitable distribution of the cost for land, engineering design, construction and maintenance of the regional treatment option.
Alternate requirements. The City Engineer may establish stormwater management requirements more stringent than those set forth in this section if the City Engineer determines that an added level of protection is needed to protect sensitive resources.
Permit required. No responsible party may undertake a land-disturbing construction activity without receiving a postconstruction runoff permit from the City Engineer prior to commencing the proposed activity.
Permit application and fees. Unless specifically excluded by this chapter, any responsible party desiring a permit shall submit to the City Engineer a permit application made on a form provided by the City Engineer for that purpose.
Unless otherwise excepted by this chapter, a permit application must be accompanied by a stormwater management plan, a maintenance agreement and a nonrefundable permit administration fee.
The stormwater management plan shall be prepared to meet the requirements of §§ 377-7 and 377-9, the maintenance agreement shall be prepared to meet the requirements of § 377-10, the financial guarantee shall meet the requirements of § 377-11, and fees shall be those established by the City Council as set forth in § 377-12.
Review and approval of permit application. The City Engineer shall review any permit application that is submitted with a stormwater management plan, maintenance agreement and the required fee. The following approval procedure shall be used:
Within 14 business days of the receipt of a complete permit application, including all items as required by Subsection B, the City Engineer shall inform the applicant whether the application, plan and maintenance agreement are approved or disapproved based on the requirements of this chapter.
If the stormwater permit application, plan and maintenance agreement are approved, or if an agreed-upon payment of fees in lieu of stormwater management practices is made, the City Engineer shall issue the permit.
If the stormwater permit application, plan or maintenance agreement is disapproved, the City Engineer shall detail in writing the reasons for disapproval.
The City Engineer may request additional information from the applicant. If additional information is submitted, the City Engineer shall have 14 business days from the date the additional information is received to inform the applicant that the plan and maintenance agreement are either approved or disapproved.
Failure by the City Engineer to inform the permit applicant of a decision within 14 business days of a required submittal shall be deemed to mean approval of the submittal and the applicant may proceed as if a permit had been issued.
Permit requirements. All permits issued under this chapter shall be subject to the following conditions, and holders of permits issued under this chapter shall be deemed to have accepted these conditions. The City Engineer may suspend or revoke a permit for violation of a permit condition, following written notification of the responsible party. An action by the City Engineer to suspend or revoke this permit may be appealed in accordance with § 377-14.
Compliance with this permit does not relieve the responsible party of the responsibility to comply with other applicable federal, state and local laws and regulations.
The responsible party shall design and install all structural and nonstructural stormwater management measures in accordance with the approved stormwater management plan and this permit.
The responsible party shall notify the City Engineer at least seven business days before commencing any work in conjunction with the stormwater management plan, and within 14 business days upon completion of the stormwater management practices. If required as a special condition under Subsection E, the responsible party shall make additional notification according to a schedule set forth by the City Engineer so that practice installations can be inspected during construction.
Practice installations required as part of this chapter shall be certified "as built" by a licensed professional engineer. Completed stormwater management practices must pass a final inspection by the City Engineer or its designee to determine if they are in accordance with the approved stormwater management plan and ordinance. The City of Waterloo or its designee shall notify the responsible party in writing of any changes required in such practices to bring them into compliance with the conditions of this permit.
The responsible party shall notify the City of Waterloo of any significant modifications it intends to make to an approved stormwater management plan. The City Council may require that the proposed modifications be submitted to it for approval prior to incorporation into the stormwater management plan and execution by the responsible party.
The responsible party shall maintain all stormwater management practices in accordance with the stormwater management plan until the practices either become the responsibility of the City of Waterloo or are transferred to subsequent private owners as specified in the approved maintenance agreement.
The responsible party authorizes the City of Waterloo to perform any work or operations necessary to bring stormwater management measures into conformance with the approved stormwater management plan, and consents to a special assessment or charge against the property as authorized under Subchapter VII of Chapter 66, Wis. Stats., or to charging such costs against the financial guarantee posted under § 377-11.
If so directed by the City of Waterloo, the responsible party shall repair at the responsible party's own expense all damage to adjoining municipal facilities and drainageways caused by runoff, where such damage is caused by activities that are not in compliance with the approved stormwater management plan.
The responsible party shall permit property access to the City of Waterloo or its designee for the purpose of inspecting the property for compliance with the approved stormwater management plan and this permit.
Where site development or redevelopment involves changes in direction, increases in peak rate and/or total volume of runoff from a site, the City of Waterloo may require the responsible party to make appropriate legal arrangements with affected property owners concerning the prevention of endangerment to property or public safety.
Plan requirements. The stormwater management plan required under § 377-8B shall contain at a minimum the following information:
A narrative describing the proposed project.
Name, address and telephone number for the following or their designees: landowner; developer; project engineer for practice design and certification; person(s) responsible for installation of stormwater management practices; and person(s) responsible for maintenance of stormwater management practices prior to the transfer, if any, of maintenance responsibility to another party.
A proper legal description of the property proposed to be developed, referenced to the U.S. Public Land Survey system or to block and lot numbers within a recorded land subdivision plat.
Predevelopment site conditions, including:
A summary of runoff peak flow rate calculations, by watershed area, including predevelopment peak flow rates; drainage area of the watershed, runoff curve numbers (RCNs); and time of concentration (Tc) used in calculations.
One or more site maps at a scale of not greater than one inch equals 100 feet. The site maps shall show the following: site location; property lines; all buildings and outdoor uses; all roads, driveways and parking lots; existing cover type and condition; topographic contours of the site at a scale not to exceed two feet; topography and drainage network including enough of the contiguous properties to show runoff patterns onto, through and from the site; watercourses that may affect or be affected by runoff from the site; flow path and direction for all stormwater conveyance systems; watershed boundaries used in hydrology determinations to show compliance with performance standards; lakes, streams, wetlands, channels, ditches and other watercourses on and immediately adjacent to the site; limits of the one-hundred-year floodplain; location of wells and wellhead protection areas covering the project area and delineated pursuant to Section NR 811.16, Wis. Adm. Code.
Hydrology and pollutant loading computations as needed to show compliance with performance standards. All major assumptions used in developing input parameters shall be clearly stated. The geographic areas used in making the calculations shall be clearly cross-referenced to the required map(s).
Postdevelopment site conditions, including:
A summary of runoff peak flow rate calculations, by watershed area, including postdevelopment peak flow rates with and without detention; drainage area of the watershed, runoff curve numbers (RCNs); and time of concentration (Tc) used in calculations.
Explanation of the provisions to preserve and use natural topography and land cover features to minimize changes in peak flow runoff rates and volumes to surface waters and wetlands.
Explanation of any restrictions on stormwater management measures in the development area imposed by wellhead protection plans and ordinances.
One or more site maps at a scale of not less than one inch equals 100 feet showing the following: postconstruction pervious areas including vegetative cover type and condition; impervious surfaces including all buildings, structures and pavement; postconstruction topographic contours of the site at a scale not to exceed two feet; postconstruction drainage network including enough of the contiguous properties to show runoff patterns onto, through and from the site; locations and dimensions of drainage easements; locations of maintenance easements specified in the maintenance agreement; flow path and direction for all stormwater conveyance systems; location and type of all stormwater management conveyance and treatment practices, including the on-site and off-site tributary drainage area; location and type of conveyance system that will carry runoff from the drainage and treatment practices to the nearest adequate outlet such as a curbed street, storm drain or natural drainageway; watershed boundaries used in hydrology and pollutant loading calculations and any changes to lakes, streams, wetlands, channels, ditches and other watercourses on and immediately adjacent to the site.
Hydrology and pollutant loading computations as needed to show compliance with performance standards. The computations shall be made for each discharge point in the development, and the geographic areas used in making the calculations shall be clearly cross-referenced to the required map(s).
Results of investigations of soils and groundwater required for the placement and design of stormwater management measures. Detailed drawings including cross-sections and profiles of all permanent stormwater conveyance and treatment practices.
A description and installation schedule for the stormwater management practices needed to meet the performance standards in § 377-7.
A maintenance plan developed for the life of each stormwater management practice including the required maintenance activities and maintenance activity schedule.
Other information requested in writing by the City of Waterloo to determine compliance of the proposed stormwater management measures with the provisions of this chapter.
All site investigations, plans, designs, computations and drawings shall be certified by a licensed professional engineer to be prepared in accordance with accepted engineering practice and requirements of this chapter.
Maintenance agreement required. The maintenance agreement required under § 377-8B for stormwater management practices shall be an agreement between the administering authority and the responsible party to provide for maintenance of stormwater practices beyond the duration period of this permit. The maintenance agreement shall be filed with the County Register of Deeds as a property deed restriction so that it is binding upon all subsequent owners of the land served by the stormwater management practices.
Agreement provisions. The maintenance agreement shall contain the following information and provisions and be consistent with the maintenance plan required by § 377-9A(8):
Identification of the stormwater facilities and designation of the drainage area served by the facilities.
A schedule for regular maintenance of each aspect of the stormwater management system consistent with the stormwater management plan required under § 377-8B.
Identification of the responsible party(ies), organization or city, county, town or village responsible for long-term maintenance of the stormwater management practices identified in the stormwater management plan required under § 377-8B.
Requirement that the responsible party(ies), organization or city, county, town or village shall maintain stormwater management practices in accordance with the schedule included in Subsection B(2).
Authorization for the City of Waterloo to access the property to conduct inspections of stormwater management practices as necessary to ascertain that the practices are being maintained and operated in accordance with the agreement.
A requirement on the City of Waterloo to maintain public records of the results of the site inspections, to inform the responsible party responsible for maintenance of the inspection results, and to specifically indicate any corrective actions required to bring the stormwater management practice into proper working condition.
Agreement that the party designated under Subsection B(3), as responsible for long-term maintenance of the stormwater management practices, shall be notified by the City of Waterloo of maintenance problems which require correction. The specified corrective actions shall be undertaken within a reasonable time frame as set by the City of Waterloo.
Authorization of the City of Waterloo to perform the corrected actions identified in the inspection report if the responsible party designated under Subsection B(3) does not make the required corrections in the specified time period. The City of Waterloo shall enter the amount due on the tax rolls and collect the money as a special charge against the property pursuant to Subchapter VII of Chapter 66, Wis. Stats.
Establishment of the guarantee. The City of Waterloo may require the submittal of a financial guarantee, the form and type of which shall be acceptable to the City of Waterloo. The financial guarantee shall be in an amount determined by the City of Waterloo to be the estimated cost of construction and the estimated cost of maintenance of the stormwater management practices during the period which the designated party in the maintenance agreement has maintenance responsibility. The financial guarantee shall give the City of Waterloo the authorization to use the funds to complete the stormwater management practices if the responsible party defaults or does not properly implement the approved stormwater management plan, upon written notice to the responsible party by the City of Waterloo that the requirements of this chapter have not been met.
Conditions for release. Conditions for the release of the financial guarantee are as follows:
The City of Waterloo shall release the portion of the financial guarantee established under this section, less any costs incurred by the City of Waterloo to complete installation of practices, upon submission of "as built plans" by a licensed professional engineer. The City of Waterloo may make provisions for a partial pro-rata release of the financial guarantee based on the completion of various development stages.
The City of Waterloo shall release the portion of the financial guarantee established under this section to assure maintenance of stormwater practices, less any costs incurred by the City of Waterloo, at such time that the responsibility for practice maintenance is passed on to another entity via an approved maintenance agreement.
The fees referred to in other sections of this chapter shall be established by the City of Waterloo and may from time to time be modified by resolution. A schedule of the fees established by the City of Waterloo shall be available for review in City Hall.
Any land-disturbing construction activity or postconstruction runoff initiated after the effective date of this chapter by any person, firm, association or corporation subject to the chapter provisions shall be deemed a violation unless conducted in accordance with the requirements of this chapter.
The City of Waterloo shall notify the responsible party by certified mail of any noncomplying land-disturbing construction activity or postconstruction runoff. The notice shall describe the nature of the violation, remedial actions needed, a schedule for remedial action, and additional enforcement action which may be taken.
Upon receipt of written notification from the City of Waterloo under Subsection B, the responsible party shall correct work that does not comply with the stormwater management plan or other provisions of this permit. The responsible party shall make corrections as necessary to meet the specifications and schedule set forth by the City of Waterloo in the notice.
If the violations to a permit issued pursuant to this chapter are likely to result in damage to properties, public facilities or waters of the state, the City of Waterloo may enter the land and take emergency actions necessary to prevent such damage. The costs incurred by the City of Waterloo plus interest and legal costs shall be billed to the responsible party.
The City of Waterloo is authorized to post a stop-work order on all land-disturbing construction activity that is in violation of this chapter, or to request the Municipal Attorney to obtain a cease-and-desist order in any court with jurisdiction.
The City of Waterloo may revoke a permit issued under this chapter for noncompliance with chapter provisions.
Any permit revocation, stop-work order or cease-and-desist order shall remain in effect unless retracted by the City of Waterloo or by a court with jurisdiction.
The City of Waterloo is authorized to refer any violation of this chapter, or of a stop-work order or cease-and-desist order issued pursuant to this chapter, to the Municipal Attorney for the commencement of further legal proceedings in any court with jurisdiction.
Any person, firm, association or corporation who does not comply with the provisions of this chapter shall be subject to a forfeiture of not less than $200 nor more than $500 per offense, together with the costs of prosecution. Each day that the violation exists shall constitute a separate offense.
Compliance with the provisions of this chapter may also be enforced by injunction in any court with jurisdiction. It shall not be necessary to prosecute for forfeiture or a cease-and-desist order before resorting to injunctional proceedings. Note: Injunctional orders are authorized pursuant § 62.23(8), Wis. Stats.
When the City of Waterloo determines that the holder of a permit issued pursuant to this chapter has failed to follow practices set forth in the stormwater management plan, or has failed to comply with schedules set forth in said stormwater management plan, the City of Waterloo or a party designated by the City of Waterloo may enter upon the land and perform the work or other operations necessary to bring the condition of said lands into conformance with requirements of the approved plan. The City of Waterloo shall keep a detailed accounting of the costs and expenses of performing this work. These costs and expenses shall be deducted from any financial security posted pursuant to § 377-11 of this chapter. Where such a security has not been established, or where such a security is insufficient to cover these costs, the costs and expenses shall be entered on the tax roll as a special charge against the property and collected with any other taxes levied thereon for the year in which the work is completed.
Administrative Review Appeals Board. The board of appeals, created pursuant to Chapter 6 of the City of Waterloo ordinances pursuant to § 59.694, 60.65, 61.354(4)(b) or 62.23(7)(e), Wis. Stats., shall hear and decide appeals where it is alleged that there is error in any order, decision or determination made by the City of Waterloo in administering this chapter. The board shall also use the rules, procedures, duties and powers authorized by statute in hearing and deciding appeals. Upon appeal, the board may authorize variances from the provisions of this chapter that are not contrary to the public interest, and where owing to special conditions a literal enforcement of the chapter will result in unnecessary hardship.
Who may appeal. Appeals to the board of appeals may be taken by any aggrieved person or by an officer, department, board or bureau of the City of Waterloo affected by any decision of the Common Council.