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Choose your valve size

Step 1: Calculate Rainfall

1. Use rainfall intensity chart to find rainfall amount in inches per hour (in./hr.) for the site, then calculate to determine feet per hour (ft./hr.)
Rainfall ___________ in./hr. divided by 12 in. = ___________ ft./hr.
2. Measure stormwater drainage area to be protected by oil stop valve , then determine square footage as follows:
Length ___________ ft. x Width ___________ ft. = ___________ sq. ft.
3. Multiply the rainfall (ft./hr.) in step 1. by the area (sq.ft.) in step 2 determine the oil stop valve flow rate in cubic feet per hour (cu.ft./hr.):
___________ ft./hr x ___________ sq.ft. = ___________ cu.ft./hr.
4. Multiply flow rate (cu.ft./hr.) from step 3 by 0.1247 to convert flow rate to U.S. gallon per minute (gpm):
___________ cu.ft./hr. x 0.1247 = ___________ gpm.

Step 2: Choose Valve Size

VALVE SIZE (MAX) FLOW RATE
4″ DIAMETER 160 GPM
4″ DIAMETER 160 GPM
6″ DIAMETER 360 GPM
8″ DIAMETER 600 GPM
10″ DIAMETER 900 GPM
12″ DIAMETER 1400 GPM

WARNING: EXCEEDING THESE FLOW RATES MAY CAUSE PREMATURE CLOSING.

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