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City of Grand Junction, CO
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Volume II Development Regulations
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Title 28 Stormwater Management Manual
Title 28
Stormwater Management Manual
[Prior legislation – Res. 68-94.]
Chapter 28.04
Introduction
§ 28.04.010
General index.
§ 28.04.020
Purpose and intent.
§ 28.04.030
Amendments to this manual.
§ 28.04.040
Purchase of a copy of the manual codified in this title.
§ 28.04.050
Acknowledgement.
§ 28.04.060
Updating and revisions.
Chapter 28.08
General Provisions
§ 28.08.010
Title.
§ 28.08.020
Jurisdiction.
§ 28.08.030
Adoption authority.
§ 28.08.040
Enforcement responsibility.
§ 28.08.050
Review and acceptance.
§ 28.08.060
Interpretation.
§ 28.08.070
Deviation/variance procedures.
§ 28.08.080
Acronyms.
§ 28.08.090
Definitions.
Chapter 28.12
Drainage Planning Submittal Requirements
§ 28.12.010
Review process.
§ 28.12.020
Submittal requirements.
§ 28.12.030
Conceptual/preliminary drainage report.
§ 28.12.040
Conceptual/preliminary report contents.
§ 28.12.050
Conceptual/preliminary report drawing contents.
§ 28.12.060
Final drainage report.
§ 28.12.070
Final report contents.
§ 28.12.080
Final report drawing contents.
§ 28.12.090
Construction plans.
§ 28.12.100
Post-construction BMPs.
§ 28.12.110
Construction SWMP.
§ 28.12.120
Record drawings and acceptances.
§ 28.12.130
Submittal checklist.
Chapter 28.16
Drainage Policy
§ 28.16.010
Introduction.
§ 28.16.020
Basic principles.
§ 28.16.030
Regional and local planning.
§ 28.16.040
Regional master planning.
§ 28.16.050
Drainage improvements.
§ 28.16.060
Drainage fee calculation.
§ 28.16.070
Proposed drainage improvements.
§ 28.16.080
Floodplain management.
§ 28.16.090
Storm runoff detention.
§ 28.16.100
Storm runoff retention.
§ 28.16.110
Stormwater quality.
§ 28.16.120
Drainage facilities maintenance.
§ 28.16.130
Watershed transfer of storm runoff.
§ 28.16.140
Technical criteria – Stormwater management technology.
§ 28.16.150
Technical criteria – Design storm events.
§ 28.16.160
Technical criteria – Storm runoff determination.
§ 28.16.170
Technical criteria – Streets.
§ 28.16.180
Technical criteria – Flood proofing.
§ 28.16.190
Technical criteria – Alluvial fans.
§ 28.16.200
Irrigation facilities.
§ 28.16.210
Irrigation facilities – Watershed analysis.
§ 28.16.220
Irrigation facilities – Discharge to irrigation conveyance facility.
§ 28.16.230
Irrigation facilities – Irrigation reservoirs.
§ 28.16.240
Preservation of natural drainageways.
Chapter 28.20
(Reserved)
Chapter 28.24
Rainfall
§ 28.24.010
Introduction.
§ 28.24.020
Data sources.
§ 28.24.030
Comparison to NOAA Atlas 14.
§ 28.24.040
Rainfall analysis – Rainfall depth – Duration – Frequency.
§ 28.24.050
Rainfall analysis – Rainfall depths for durations from one to six hours and less than one hour.
§ 28.24.060
Rainfall analysis – Mean annual precipitation and storm events.
§ 28.24.070
Depth-area reduction factors.
§ 28.24.080
Intensity-duration-frequency curves for rational method.
§ 28.24.090
Design storms.
Chapter 28.28
Storm Runoff
§ 28.28.010
Introduction.
§ 28.28.020
Watershed characteristics.
§ 28.28.030
Time of concentration.
§ 28.28.040
Nonurbanized watersheds.
§ 28.28.050
Urbanized watersheds.
§ 28.28.060
Precipitation losses.
§ 28.28.070
SCS curve number method.
§ 28.28.080
CN determination.
§ 28.28.090
Green and Ampt method.
§ 28.28.100
Rational formula method.
§ 28.28.110
SCS unit hydrograph method.
§ 28.28.120
Channel routing of hydrographs.
§ 28.28.130
Reservoir routing of hydrographs.
Chapter 28.32
Open Channels
§ 28.32.010
Introduction.
§ 28.32.020
Parameters and terms commonly used in open channel analysis and design.
§ 28.32.030
General open channel flow.
§ 28.32.040
Uniform flow computation.
§ 28.32.050
Critical flow computation.
§ 28.32.060
Design procedures – Subcritical flow.
§ 28.32.070
Design procedures – Supercritical flow.
§ 28.32.080
Design procedures – Superelevation.
§ 28.32.090
Transitions.
§ 28.32.100
Types of open channels and their selection.
§ 28.32.110
Natural channel systems.
§ 28.32.120
Channel morphology.
§ 28.32.130
Channel restoration.
§ 28.32.140
General design criteria for improved open channels.
§ 28.32.150
Channel type selection.
§ 28.32.160
Hydraulic capacity.
§ 28.32.170
Manning roughness coefficient.
§ 28.32.180
Uniform flow.
§ 28.32.190
Vertical and horizontal alignment.
§ 28.32.200
Maximum permissible velocity.
§ 28.32.210
Subcritical and supercritical flow.
§ 28.32.220
Freeboard.
§ 28.32.230
Flow transitions.
§ 28.32.240
Access and safety.
§ 28.32.250
Environmental permitting.
§ 28.32.260
Maintenance.
§ 28.32.270
Design criteria for natural and alluvial-bed (erodible) channels.
§ 28.32.280
Grass-lined channels.
§ 28.32.290
Wetland-bottom channel.
§ 28.32.300
Design criteria – Riprap-lined channels.
§ 28.32.310
Design criteria – Concrete-lined channels.
§ 28.32.320
Design criteria – Other channel linings.
§ 28.32.330
Design standards for minor artificial drainageways.
§ 28.32.340
Channel appurtenances.
§ 28.32.350
Example application.
Chapter 28.36
Additional Hydraulic Structures
§ 28.36.010
Introduction.
§ 28.36.020
Channel drop structures.
§ 28.36.030
Grouted sloping boulder (GSB) drop structure.
§ 28.36.040
Vertical riprap drop structure (vertical hard drop basin).
§ 28.36.050
Straight drop spillway.
§ 28.36.060
Baffled aprons (USBR Type IX, baffle chute drop).
§ 28.36.070
Energy dissipation structures.
§ 28.36.080
Increased roughness basins.
§ 28.36.090
Induced hydraulic jump basins.
§ 28.36.100
Impact basins.
§ 28.36.110
Overbank prevention structures and wasteways.
§ 28.36.120
Side-channel spillways.
§ 28.36.130
Gated turnouts.
§ 28.36.140
Pipe appurtenances.
§ 28.36.150
Pipe collars.
§ 28.36.160
Thrust blocks at pipe bends.
§ 28.36.170
Valves.
Chapter 28.40
Storm Drain Systems
§ 28.40.010
Introduction.
§ 28.40.020
Storm drain design criteria.
§ 28.40.030
Storm drain design criteria – Allowable capacity.
§ 28.40.040
Storm drain design criteria – Allowable velocity.
§ 28.40.050
Storm drain design criteria – Pipe roughness.
§ 28.40.060
Storm drain design criteria – System layout.
§ 28.40.070
Storm drain hydraulics.
§ 28.40.080
Gravity-flow analysis.
§ 28.40.090
Pressure-flow analysis.
§ 28.40.100
Computer hydraulic modeling.
§ 28.40.110
Construction standards.
§ 28.40.120
Storm drain pipe.
§ 28.40.130
Manholes.
§ 28.40.140
Inlets.
§ 28.40.150
Outlets.
§ 28.40.160
Storm drain system design.
§ 28.40.170
Initial storm drain design.
§ 28.40.180
Preliminary/final storm drain design.
§ 28.40.190
Example design application.
Chapter 28.44
Streets
§ 28.44.010
Introduction.
§ 28.44.020
Streets as part of the drainage system.
§ 28.44.030
Drainage impacts on traffic and streets.
§ 28.44.040
Sheet flow.
§ 28.44.050
Gutter flow.
§ 28.44.060
Temporary ponding and localized cross flow.
§ 28.44.070
Pavement deterioration effects.
§ 28.44.080
Sedimentation and debris.
§ 28.44.090
Street classification and allowable flow depth and velocities.
§ 28.44.100
Street hydraulic capacity evaluation.
§ 28.44.110
Storm inlet selection, sizing, and location.
§ 28.44.120
Hydraulic capacity of inlets on a continuous grade.
§ 28.44.130
Hydraulic capacity of inlets in sump conditions.
§ 28.44.140
Inlet clogging considerations.
§ 28.44.150
Grate selection and rating.
§ 28.44.160
Inlet location and spacing.
Chapter 28.48
Culverts and Bridges
§ 28.48.010
Introduction.
§ 28.48.020
Culvert hydraulics.
§ 28.48.030
Required design information.
§ 28.48.040
Inlet control.
§ 28.48.050
Outlet control.
§ 28.48.060
Culvert sizing and design.
§ 28.48.070
Size and material.
§ 28.48.080
Location.
§ 28.48.090
Culvert Design Form.
§ 28.48.100
Inlet control calculation.
§ 28.48.110
Outlet control calculation.
§ 28.48.120
Evaluation of results.
§ 28.48.130
Outlet velocity calculation.
§ 28.48.140
Computer applications.
§ 28.48.150
Outlet protection.
§ 28.48.160
Trash/safety racks.
§ 28.48.170
Culvert inlets.
§ 28.48.180
Projecting inlets.
§ 28.48.190
Inlets with headwalls.
§ 28.48.200
Tapered inlets.
§ 28.48.210
Bridge hydraulics.
§ 28.48.220
Hydraulic analysis.
§ 28.48.230
Expression of backwater.
§ 28.48.240
Backwater coefficient.
§ 28.48.250
Effect of M and abutment shape (base curves).
§ 28.48.260
Effect of piers (normal crossings).
§ 28.48.270
Bridge sizing and design.
§ 28.48.280
Example application – Culvert sizing.
Chapter 28.52
Irrigation/Drainage Structures
§ 28.52.010
Introduction.
§ 28.52.020
Irrigation ditch crossings (cross-drainage structures).
§ 28.52.030
Inverted siphons.
§ 28.52.040
Overchutes (flumes and pipe overchutes).
Chapter 28.56
Detention and Retention
§ 28.56.010
Introduction.
§ 28.56.020
Detention versus retention.
§ 28.56.030
Local detention facilities.
§ 28.56.040
Regional detention facilities.
§ 28.56.050
Drainage fee in lieu of detention.
§ 28.56.060
Drainage fee basis.
§ 28.56.070
Drainage fee calculation.
§ 28.56.080
Detention for management of stormwater quality.
§ 28.56.090
Design storm criteria.
§ 28.56.100
Geometric requirements.
§ 28.56.110
Dry basin bottom drainage.
§ 28.56.120
Accessibility and maintenance.
§ 28.56.130
Calculating storage volume available.
§ 28.56.140
Groundcover and landscaping.
§ 28.56.150
Freeboard requirements.
§ 28.56.160
State Engineer’s Office.
§ 28.56.170
Embankment protection.
§ 28.56.180
Inlet and outlet design.
§ 28.56.190
Off-site flows.
§ 28.56.200
Retention.
§ 28.56.210
Hydrologic design methods and criteria.
§ 28.56.220
HEC-1 method.
§ 28.56.230
Rational method.
§ 28.56.240
Compensating detention analysis.
§ 28.56.250
Over-detention analysis.
§ 28.56.260
Hydraulic design of outlet works.
Chapter 28.60
Construction Site Stormwater Runoff Control
§ 28.60.010
Introduction.
§ 28.60.020
Colorado discharge permit.
§ 28.60.030
Standards and requirements – Stormwater discharge limitations.
§ 28.60.040
Standards and requirements – Minimum BMP requirements.
§ 28.60.050
Standards and requirements – Acceptable BMPs.
§ 28.60.060
Stormwater permit.
§ 28.60.070
Stormwater permit variance/exception.
§ 28.60.080
Inspection and enforcement – Mesa County.
§ 28.60.090
Inspection and enforcement – City of Grand Junction.
§ 28.60.100
Inspection and enforcement – Other municipalities.
§ 28.60.110
Construction SWMP.
§ 28.60.120
Site description.
§ 28.60.130
Site map.
§ 28.60.140
Stormwater management controls.
§ 28.60.150
Final stabilization and long-term stormwater management.
§ 28.60.160
Inspection and maintenance.
§ 28.60.170
Certification.
§ 28.60.180
Estimated BMP costs.
§ 28.60.190
Permit transfer requirements.
§ 28.60.200
Checklist.
Chapter 28.64
Post-Construction Stormwater Management
§ 28.64.010
Introduction.
§ 28.64.020
Standards for best management practices (BMPs) – Minimum structural BMPs requirements.
§ 28.64.030
Standards for best management practices (BMPs) – Aesthetic requirements.
§ 28.64.040
Standards for best management practices (BMPs) – Proprietary BMPs.
§ 28.64.050
Standards for best management practices (BMPs) – Considerations in BMPs selection.
§ 28.64.060
Standards for best management practices (BMPs) – Local modifications to minimum structural BMPs.
§ 28.64.070
Final drainage report.
§ 28.64.080
Water quality capture volume.
§ 28.64.090
Directly connected impervious area.
§ 28.64.100
Water quality capture volume.
§ 28.64.110
Nonstructural BMPs – General information.
§ 28.64.120
Nonstructural BMPs – Spill prevention and response.
§ 28.64.130
Inspection and enforcement.
§ 28.64.140
BMPs for industrial and commercial activities.
§ 28.64.150
Industrial and commercial activities.
§ 28.64.160
Best management practices.
Chapter 28.68
Standard Forms
§ 28.68.010
Hydrologic and hydraulic design forms.
§ 28.68.020
Stormwater permit applications and report forms.
Chapter 28.72
References
§ 28.72.010
References.
Chapter 28.76
Drainage Law
§ 28.76.010
Introduction.
§ 28.76.020
Historical evolution of surface water drainage law.
§ 28.76.030
Legal principles.
§ 28.76.040
Local governments – Drainage responsibilities and powers.
§ 28.76.050
Applicable drainage laws.
§ 28.76.060
Special matters – Irrigation ditches.
§ 28.76.070
Special matters – Ditch owner’s duty to maintain, use and manage their ditches.
§ 28.76.080
Special matters – Water quality.
§ 28.76.090
Special matters – Economic loss rule – Duty of care.
§ 28.76.100
Special matters – Water rights and drainage improvements.
§ 28.76.110
Special matters – Governmental entity not liable for refusal to issue certificate of occupancy of residence constructed in a floodplain.
§ 28.76.120
Special matters – Any legislatively formulated assessment, fee or charge that is imposed on a broad class of property owners by a local government is not considered taking of property.
§ 28.76.130
Special matters – Governmental immunity in regard to irrigation and drainage ditches used as part of stormwater drainage system.
§ 28.76.140
Special matters – Concerning interference with the flow of water in ditch.
Chapter 28.80
Excerpts From UDSCD Volume 3
§ 28.80.010
Excerpts from UDSCD Volume 3.
Chapter 28.84
Cross-Reference Table
§ 28.84.010
Cross-reference table.