[Ord. No. 751 § 31-14.1]
An application for development shall comply with requirements set forth hereinafter, unless the requirement herein is contrary to any State or Federal law or regulation in which event the State or Federal law or regulation shall take precedence over the requirements herein set forth.
[Ord. No. 751 § 31-14.2]
a.
Specific Permitted Land Uses. Public recreation/open spaces uses and agriculture, including residential lawns and gardens, but not including structures or paved areas.
b.
All Other Uses. All other uses are prohibited.
c.
Stream Encroachment Permits. The Construction Official shall not issue a permit for any permitted use in a floodway area until a stream encroachment permit has been issued by the Division of Water Resources.
[Ord. No. 751 § 31-14.3]
a.
Improvements within the flood fringe areas or which are located on land which is one (1) foot or less above the flood hazard design elevation shall be subject to the following:
1.
Fill shall be no lower than one (1) foot above the flood hazard design elevation and shall extend as such for a distance of at least fifteen (15) feet beyond the limits of any structure erected thereon.
2.
Structures shall be built so that the first floor and/or basements are at a minimum of one (1) foot above the flood hazard design elevation; except that pavement and related site structures such as storm sewers, manholes, curbing, etc., shall be set at grades to be approved by the Borough Engineer.
3.
Flood proofing measures shall be consistent with the flood protection elevation for the particular area, flood velocities, durations, rates or rise, hydrostatic and hydrodynamic forces, and other similar factors.
b.
The applicant may be required to submit a plan or document certified by a licensed professional engineer that the flood proofing measures are consistent with the flood hazard design elevation and associated flood factors. Any or all of the following flood proofing measures may be required:
1.
Anchorage to resist flotation and lateral movements;
2.
Installation of watertight doors, bulkheads, and shutters, or similar devices;
3.
Reinforced walls to resist water pressures;
4.
Use of paints, membranes, or mortars to reduce seepage of water through walls;
5.
Addition of weight to structures to resist flotation;
6.
Installation of pumps to lower water levels in structures;
7.
Construction of water supply and waste treatment systems in a manner which prevents the entrance of flood waters;
8.
Pumping facilities, or comparable measures, for the subsurface drainage systems of buildings to relieve external foundation walls and basement flood pressures;
9.
Construction that resists rupture or collapse caused by water pressure or floating debris;
10.
Installation of valves or controls on sanitary and storm drains which will permit the drains to be closed to prevent backup of sewage or storm waters into the structure. Gravity drainage of basements may be eliminated by mechanical devices;
11.
All electrical equipment panels, outlets, and electrical appliances shall be located at least four (4) feet above the level of the flood hazard design elevation to assure that they will not be subject to inundation of flooding;
12.
Storage facilities for chemicals, explosives, buoyant materials, flammable liquids, or other toxic or hazardous materials shall be situated at least six (6) feet above the flood hazard design elevation and shall be floodproofed to prevent flotation of storage containers or damage to storage containers which could result in the escape of toxic materials into the flood waters;
13.
Use of construction materials which are resistant to water damage.
c.
The applicant shall provide all information deemed necessary by the Construction Official and/or the Borough Engineer for their determination.
[Ord. No. 751 § 31-14.4]
a.
One- and Two-Family Dwellings. For one- and two- family dwellings for which site plan submissions are not required to be made, the following information shall be submitted in order to protect against adverse consequences for surface water drainage:
1.
The existing surface drainage pattern as it affects the subject property and all abutting properties;
2.
Any proposed changes in the existing surface drainage pattern which will result from the construction of the dwelling proposed for the subject property, including any proposed changes on abutting properties;
3.
The elevation of the street at each limit of the subject property frontage;
4.
The elevations of the finished garage floor and first floor of the dwelling proposed for the subject property;
5.
The proposed location of all roof leaders and drains;
6.
The outer limits of all areas in which any filling or grading is proposed; and
7.
The location of all existing trees with trunks exceeding five (5) inches in diameter measured at a point four (4) feet above the existing ground level, which trees are located within the outer limits of the areas in which any filling or grading is proposed as well as within ten (10) feet of the outer limits of any such areas.
b.
Nonresidential and Multiple Family Uses. For nonresidential and multiple family uses, land areas shall only be developed or improved, where reasonably possible, so that:
1.
The rate of storm water run-off from the area is not increased over that which occurs under existing conditions;
2.
The drainage characteristics of adjacent areas are not adversely affected;
3.
Soil erosion during and after development is not increased over that which occurs under existing conditions;
4.
Soil absorption and ground water recharge capacity of the area is not decreased below that which occurs under existing conditions; and
5.
The natural drainage pattern of the area is not significantly disturbed.
c.
Permitted Detention Systems.
1.
Depressions in parking areas, excavations, basins created through use of curbs, stabilized earth berms or dikes, or any other form of grading which serves to temporarily and safely impound and store storm water.
2.
Roof tops which temporarily and safely impound and store storm water including drain outlets which restrict the rate of run-off from roof surface.
3.
Drywells or leaching basins which control storm water run-off through ground absorption restricted outflow.
4.
Porous asphalt pavement which preserves the natural ground absorption rate of a site and provides a subsurface reservoir for temporary storage of storm water.
5.
Any system of porous media, such as gravel trenches drained by porous wall or perforated pipe, which temporarily stores and dissipates storm water through ground absorption.
6.
Any combination of the above systems which limits storm water run-off from a given site to that which occurs under existing conditions.
d.
Design of Storm Water Detention Facilities.
1.
Storm water detention facilities shall be designed to contain a volume of water equal to the increase in volume of run-off which would result from development of any site based upon the total rainfall which produced the Flood of Record for the area involved. The total rainfall which produced the Flood of Record shall be determined from records of the United States Department of Commerce, National Weather Service.
2.
The rainfall excess shall be computed using run-off coefficients not less than the following:
Surface Type | Run-Off Coefficients |
|---|---|
Asphalt | 0.95 |
Concrete | 0.95 |
Roofs | 0.95 |
Lawns: Sandy Soils Flat | |
Less than 2% | 0.10 |
Average, 2 to 7% | 0.20 |
Steep, 7% or over | 0.25 |
Lawns: Heavy Solids Flat | |
Less than 2% | 0.15 |
Average, 2 to 7% | 0.25 |
Steep, 7% or over | 0.35 |
Unimproved Areas | 0.20 |
Run-off coefficients for other surfaces shall be established by the Borough Engineer. |
3.
The run-off coefficients shall be determined for each site for both existing and proposed conditions and the difference in the two shall be used to compute the volume of rainfall excess for design of storm water detention facilities shall be equal to the depth of the rainfall excess multiplied by the area of the surface.
4.
Detention facilities which utilize porous media for absorption such as drywells and porous pavement, shall be of such a size to contain the total volume of rainfall excess within the voids. Ground absorption systems shall be used only where the infiltration rate of the receiving soil is acceptable as determined by percolation tests and soil borings, or as determined by the Borough Engineer. Provisions shall be made to contain overflow of such systems on site or to surface drain the overflow in such a way as not to adversely affect any adjacent property.
5.
Detention facilities which utilize surface impoundment, such as depressions in parking area, roof tops and diked areas shall provide sufficient volume to fully contain the total volume or rainfall excess. The outlets of such facilities shall be designed to limit the maximum discharge rate or storm water run-off to that which occurs at the site under existing conditions and shall discharge in such a way as to not adversely affect adjacent property. If rooftop storage is proposed, the weight of the water on the roof shall be provided for in the structural design of the building and the roof shall be designed to provide maximum protection against leakage. Earth berms or dikes used to create an impounding area shall be stabilized with the slopes protected with vegetation or breaching.
6.
If a combination of different storm water techniques is used, the system shall be adequate to fully control the total volume of rainfall excess.
7.
Storm water detention facilities shall be maintained by the owner to insure continual functioning of the systems as designed and to prevent hazards associated with debris buildup and stagnant water. Water shall not be allowed to remain long enough to constitute mosquito breeding, disease, or any type of health problem. Easements shall be provided to all detention facilities from public right-of-way if required so that such facilities are available to the appropriate governmental entity for the purposes of determining if the facilities are properly maintained and where necessary, to maintain the facilities.
8.
Detention, sediment and erosion control facilities shall be designed in conformance with the "Standards for Soil Erosion and Sediment Control in New Jersey" of the New Jersey State Soil Conservation District.
9.
Facilities to control sediment and erosion shall be built prior to any other site development, and shall be in operation during all stages of development. Increased run-off resulting from modified soil and surface conditions caused by the proposed development, shall be minimized, and where possible, retained on the site. Increased erosion and sediment resulting from construction at the proposed development will be prohibited.