Total Suspended Solids (TSS) and Total Phosphorus (TP)
Reduction
| ||||||
---|---|---|---|---|---|---|
Watershed
|
New Development
|
Redevelopment
|
Routine Maintenance
| |||
TSS
|
TP
|
TSS
|
TP
|
TSS
|
TP
| |
All
|
80
|
60
|
40
|
30
|
40
|
30
|
Maximum Predevelopment Runoff Curve Numbers
| |||||
---|---|---|---|---|---|
Hydrologic Soil Group
| |||||
Vegetative Cover
|
A
|
B
|
C
|
D
| |
Meadow
|
30
|
58
|
71
|
78
| |
Woodland
|
30
|
55
|
70
|
77
|
Maximum Predevelopment Runoff Curve Numbers
| |||||
---|---|---|---|---|---|
Hydrologic Soil Group
| |||||
Vegetative Cover
|
A
|
B
|
C
|
D
| |
Woodland
|
30
|
55
|
70
|
77
| |
Grassland
|
39
|
61
|
71
|
78
| |
Cropland
|
55
|
69
|
78
|
83
|
Separation Distances and Soil Characteristics
| |||
---|---|---|---|
Source Area
|
Separation Distance
|
Soil Characteristics
| |
Industrial, commercial, institutional parking lots and roads
|
Five feet or more
|
Filtering layer
| |
Residential arterial roads
|
Five feet or more
|
Filtering layer
| |
Roofs draining to subsurface infiltration practices
|
One foot or more
|
Native or engineered soil with particles finer than coarse sand
| |
Roofs draining to surface infiltration practices
|
Not applicable
|
Not applicable
| |
All other impervious source areas
|
Three feet or more
|
Filtering layer
|