Jun 28, 2018 #1 EngrSTR Structural Jan 16, 2018 14 US Hi, Can someone please provide a good go-by or design reference for sizing a detention pond by rational method. its for a small 4 acre development.
Hi, Can someone please provide a good go-by or design reference for sizing a detention pond by rational method. its for a small 4 acre development.
Jun 28, 2018 #2 fel3 Civil/Environmental Jul 9, 2001 879 US A Google search for rational method detention basin turned up quite a few resources. This one looks like a good explanation: https://pdfs.semanticscholar.org/18ea/979294010250508a6783f50f39b935273b90.pdf ========== "Is it the only lesson of history that mankind is unteachable?" --Winston S. Churchill Upvote 0 Downvote
A Google search for rational method detention basin turned up quite a few resources. This one looks like a good explanation: https://pdfs.semanticscholar.org/18ea/979294010250508a6783f50f39b935273b90.pdf ========== "Is it the only lesson of history that mankind is unteachable?" --Winston S. Churchill
Jul 9, 2018 #3 gbam Civil/Environmental Jan 20, 2003 878 US Just an FYI, that does not exist. Rational Method computes peak discharge and does not provide hydrograph which is needed for routing. There is a "Modified" Rational Method that is out there that tries to accomplish the hydrograph issue. Upvote 0 Downvote
Just an FYI, that does not exist. Rational Method computes peak discharge and does not provide hydrograph which is needed for routing. There is a "Modified" Rational Method that is out there that tries to accomplish the hydrograph issue.
Jul 23, 2018 #4 bgo84 Civil/Environmental Jul 15, 2018 1 US While I would switch over to using SCS instead of rational, there is a crude way to get close. Rv = 0.05 + 0.9 * IA Where: Rv = Runoff coefficient (unitless) IA = Impervious fraction (unitless) DV = 3630 * RD * RV * A DV = Design volume (cu ft) RD = Design storm depth (in) A = Drainage area (ac) Again, I would strongly suggest using another method if you are trying to design a detention pond. Upvote 0 Downvote
While I would switch over to using SCS instead of rational, there is a crude way to get close. Rv = 0.05 + 0.9 * IA Where: Rv = Runoff coefficient (unitless) IA = Impervious fraction (unitless) DV = 3630 * RD * RV * A DV = Design volume (cu ft) RD = Design storm depth (in) A = Drainage area (ac) Again, I would strongly suggest using another method if you are trying to design a detention pond.