GENERAL FORMULA rainfall ft/t x surface area = approximate volume CATCHMENT AREAS BRIDGE AREA ROOF AREA SITE AREA ROADS AREA
CISTERN SIZES BASED ON 25 YEAR STORM CISTERN VOLUME: ROOF
ROADS
SITE
BRIDGE
WETLAND SIZES BASED ON WINTER RAINFALL 2 WETLANDS SIZED AT:
3FT DEEP
150 X 150 FT
TOTAL VOLUME OF WETLAND