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T-10 Permeable Pavement Systems
Figure PPS-2. Permeable Pavement Profile, Stepped Installation
• For sloped installations (slope of the reservoir/subgrade interface > 0%):
D − 6sL − 1
V = P A
12
Equation PPS-3a
While:
L < 2 WQCV
sAP
Equation PPS-3b
Where:
V = volume available in the reservoir (ft 3 )
P
s
D
L
= porosity, ≤0.30 for porous gravel, ≤0.4 for all other pavements using AASHTO
No. 57 or No. 67 coarse aggregate in the reservoir
= slope of the reservoir/subgrade interface (ft/ft)
= depth of the reservoir (in)
= length between lateral flow barriers (see step 4) (ft)
A = area of the permeable pavement (ft 2 )
WQCV = water quality capture volume (ft 3 )
PPS-8 Urban Drainage and Flood Control District August 2013
Urban Storm Drainage Criteria Manual Volume 3