Volume 2-05, Chapter 3 - City of Wichita

Volume 2-05, Chapter 3 - City of Wichita Volume 2-05, Chapter 3 - City of Wichita

11.01.2015 Views

Section 3.2.9 - Bioretention Areas Figure 3-38 Schematic of a Typical Inlet Deflector (Source: Claytor and Schueler, 1996). Page 3 - 126 Volume 2, Technical Guidance

Section 3.2.10 - Stormwater Wetland 3.2.10 Stormwater Wetland Primary Water Quality Facility Description: Constructed wetland used for stormwater management. Runoff is both stored and treated in the wetland facility. KEY CONSIDERATIONS DESIGN CRITERIA: • Minimum contributing drainage area of 25 acres • Minimum dry weather flow path of 2:1 (length: width) should be provided from inflow to outflow • Minimum of 35% of total surface area should have a depth of 6 inches or less; 10% to 20% of surface area should be deep pool (1.5 to 6 foot depth) ADVANTAGES / BENEFITS: • Good nutrient removal • Provides natural wildlife habitat • Relatively low maintenance costs DISADVANTAGES / LIMITATIONS: • Requires large land area • Needs continuous baseflow for viable wetland • Sediment regulation is critical to sustain wetlands • Large commitment to establish vegetation in the first 3 years MAINTENANCE REQUIREMENTS: • Replace wetland vegetation to maintain at least 50% surface area coverage • Remove invasive vegetation • Monitor sediment accumulation and remove periodically H M POLLUTANT REMOVAL Total Suspended Solids Nutrients – Total Phosphorus & Total Nitrogen STORMWATER MANAGEMENT SUITABILITY Water Quality Protection Channel Protection On-Site Flood Control Downstream Flood Control IMPLEMENTATION CONSIDERATIONS H M Land Requirements Capital Costs Maintenance Burden M M M Shallow Wetland ED Shallow Wetland Pond/Wetland Residential Subdivision Use: Yes High Density/Ultra-Urban: No Drainage Area: 25 acres min Soils: Hydrologic group ‘A’ and ‘B’ soils may require liner M H Metals – Cadmium, Copper, Lead & Zinc Pathogens – Coliform, Streptococci & E. Coli L=Low M=Moderate H=High Volume 2, Technical Guidance Page 3 - 127

Section 3.2.9 - Bioretention Areas<br />

Figure 3-38 Schematic <strong>of</strong> a Typical Inlet Deflector<br />

(Source: Claytor and Schueler, 1996).<br />

Page 3 - 126<br />

<strong>Volume</strong> 2, Technical Guidance

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