DRY WELL SIZE, STORAGE VOLUME OF INFILTRATION TRENCH
DRY WELL SIZE, STORAGE VOLUME OF INFILTRATION TRENCH
(OP)
I AM TRYING TO SIZE A DRYWELL FOR A TEN YEAR STORM OF 4" WITH AN IMPERVIOUS SURFACE COVER OF 4000 SQ FT. IF I REMEMBER CORRECTLY TH TOTAL RAIN RUNOFF WILL BE APPROX. 10,000 GALLONS. WHAT SIZE DRYWELL? ALSO, IF THE INFILTRATION TRENCH IS 4'X2'X75' THAT GIVES ME AN INFILTRATION VOLUME OF 6000. WOULD THE RAIN STORAGE CAPACITY BE 60% OF THAT GIVEN THE FACT IT WILL BE FILLED WITH #2 STONE. ITS BEEN AWHILE SINCE IVE HAD TO CALCULATE THIS STUFF SO I WOULD APPRECIATE THE HELP. THANKS





RE: DRY WELL SIZE, STORAGE VOLUME OF INFILTRATION TRENCH
Teddy
RE: DRY WELL SIZE, STORAGE VOLUME OF INFILTRATION TRENCH
4'x2'x75' = 600 cubic feet, not 6000. And the infiltration area would be 300 square feet (assuming the trench is 4 feet wide and 2 feet high).
When I am working with gravel, I usually assume that 40% of the volume is available (rather than 60%), but I'm not really sure how "gravel" compares to No. 2 stone, or where my 40% number comes from.