Development Standards - Report Requirements

 
Exhibit 2-2
 Checklist of Calculations to be Included with Presumptive Design Reports
 Stormwater Facility Type
A = Swale Facilities
B = Infiltration Treatment Facilities (pervious pavements, planters, basins, sand filters, soakage trenches)
C = Filtration Treatment Facilities (pervious pavements, planters, basins, sand filters)
D = Constructed Treatment Ponds & Wetlands
E = Structural Treatment Facilities
 
Parameter or Calculated to be Included in the Stormwater Report
 A
 B
C
 D
 E
 Site Variables:
Site Soil type (A, B, C, or D) x
x
 
x
 
Contributing area (acres impervious/pervious) x
x
x
x
 x
 Pre-developed curve number CN x
x
x
x
 
 Pre-developed time of concentration T of C (minutes) x
x
x
x
 
 Pst-developed curve number CN x
x
x
x
 
 Post-developed time of concentration T of C (minutes) x
x
x
x
 
 Distance from ground surface to max. height of seasonal groundwater (feet) x
x
 
x
 
 Facility Geometry:
 Side slopes (h:v or %)  x
 x
 x
 x
 
 Longitudinal slope (h:v or %)  x
 x
 x
 x
 
 Bottom width and length (feet)  x
 x
 x
 x
 
 Overall width and length (feet)  x
 x
 x
 x
 
 Hydraulic Controls:
 Orifice or weir descriptions, sizes, and elevations, including by-pass facilities      x
 x
 x
 Elevation, size, and type of overflow spillway or pipe      x
 x
 x
 Calculated Values:
 Pollution reduction flow rate  x
 
 
 
 x
 Pollution reduction permanent pool volume and elevation    x
 x
 x
 
 Forebay volume and elevation        x  
 Hydraulic residence time for the water quality storm  x        
 Detailed storm routing data (i.e. SBUH) for the water quality and flood control storm events, showing inflow rate, outflow rate, and water surface elevation in the facility every 10 minutes throughout the storm.    x
 x
 x