Land Coverage
|
Coefficient of Runoff
|
---|---|
Roof areas
|
0.95
|
Hard-surfaced pavement, patio or walk areas
|
0.80
|
Park, lawns and meadows
|
0.28
|
Undeveloped agricultural land
|
0.10
|
Stormwater facilities
|
0.00
|
CC = Land use percentage (%) of total composite coefficient
of runoff (CR)
|
Pond area
|
5%
|
0.000
|
= 0
|
Roof area
|
10%
|
0.950
|
= 0.095
|
Hard surface area
|
30%
|
0.800
|
= 0.240
|
Lawn/landscaping
|
55%
|
0.200
|
= 0.110
|
CC
|
= 0.445
|
EC =
|
AD (CR - CU) x $1,800
|
EC =
|
10 x (0.445 - 0.100) x $1,800
|
EC =
|
$6,210
|