Volume 2-05, Chapter 3 - City of Wichita
Volume 2-05, Chapter 3 - City of Wichita
Volume 2-05, Chapter 3 - City of Wichita
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Section 3.2.1 - Stormwater Pond<br />
3.2.1 Stormwater Pond Primary Water Quality Facility<br />
Description: Constructed stormwater retention basin<br />
that has a permanent water quality pool (or micropool).<br />
Run<strong>of</strong>f from each water quality rain event displaces all<br />
or part <strong>of</strong> the permanent pool, and is treated in the pool<br />
primarily through settling and biological uptake<br />
mechanisms.<br />
KEY CONSIDERATIONS<br />
DESIGN CRITERIA:<br />
• Minimum contributing drainage area <strong>of</strong> 25 acres; 10 acres for<br />
extended detention micropool pond<br />
• A sediment forebay or equivalent upstream pretreatment<br />
must be provided<br />
• Minimum length to width ratio for the pond is 1.5:1<br />
• Pond slopes shall adhere to those found in Figure 3-12<br />
ADVANTAGES / BENEFITS:<br />
• Moderate to high removal rate <strong>of</strong> urban pollutants<br />
• High community acceptance<br />
• Opportunity for wildlife habitat<br />
DISADVANTAGES / LIMITATIONS:<br />
• Potential for thermal impacts/downstream warming<br />
• Dam height restrictions for high relief areas<br />
• Pond drainage can be problematic for low relief terrain<br />
MAINTENANCE REQUIREMENTS:<br />
• Remove debris from inlet and outlet structures<br />
• Maintain side slopes / remove invasive vegetation<br />
• Monitor sediment accumulation and remove periodically<br />
• Dam inspection and maintenance<br />
H<br />
M<br />
M<br />
POLLUTANT REMOVAL<br />
Total Suspended Solids<br />
Nutrients – Total Phosphorus & Total Nitrogen<br />
Metals – Cadmium, Copper, Lead & Zinc<br />
STORMWATER MANAGEMENT<br />
SUITABILITY<br />
Water Quality Protection<br />
Channel Protection<br />
On-Site Flood Control<br />
Downstream Flood Control<br />
M<br />
L<br />
L<br />
IMPLEMENTATION<br />
CONSIDERATIONS<br />
Land Requirements<br />
Capital Costs<br />
Maintenance Burden<br />
Residential Subdivision Use: Yes<br />
High Density/Ultra-Urban: No<br />
Drainage Area: 10-25 acres min<br />
Soils: Hydrologic group ‘A’ and ‘B’<br />
soils may require pond liners<br />
Other Considerations:<br />
• Outlet Clogging<br />
• Safety Bench<br />
• Landscaping<br />
L=Low M=Moderate H=High<br />
H<br />
Pathogens – Coliform, Streptococci & E. Coli<br />
<strong>Volume</strong> 2, Technical Guidance Page 3 - 25
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