Design Of Dry Wells
Design Of Dry Wells
(OP)
There does not seem to be a lot of guidance for the design of dry wells in New York State or in general. Two questions I have which I hope someone can give me some guidance for are;
1. It appears regulations require 2-3 feet of separation from the bottom of dry well to a water table or rock. What is the reason for the 2-3 feet? Treatment? It appears regulations require a greater distance in aquifers.
2. When figuring the area for infiltration, is the surface elevation at the bottom of the dry well the only area to consider? How about the vertical portion from the existing ground to the bottom of the drywell? (the perimeter of the soil wall around the drywell)
1. It appears regulations require 2-3 feet of separation from the bottom of dry well to a water table or rock. What is the reason for the 2-3 feet? Treatment? It appears regulations require a greater distance in aquifers.
2. When figuring the area for infiltration, is the surface elevation at the bottom of the dry well the only area to consider? How about the vertical portion from the existing ground to the bottom of the drywell? (the perimeter of the soil wall around the drywell)





RE: Design Of Dry Wells
of course you cant place the bottom of your sump on rock or at the water table if you expect to have any percolation through the bottom. maintaining separation from the water table will reduce contamination of groundwater with dirty storm water. recommend more than just 2 feet. if you have shallow groundwater, a drywell may not be an ideal disposal method for your storm water.
use the entire wetted surface for percolation, just be aware that for maximum percolation, you need pressure and so you will get less percolation near the top and more at the bottom. sediment will settle on the bottom, so it may clog over time
http://lmgtfy.com/?q=soakage+pit
RE: Design Of Dry Wells
Do you know of any design guidlines that relate to utilizing the whole wetted surface?
When conducting a per test for a drywell design at what depth should the test be conducted in relation to the depth of the proposed drywell?
RE: Design Of Dry Wells
here is some information on perc testing and drywell design.
RE: Design Of Dry Wells
http://www.dec.ny.gov/docs/water_pdf/swdm2010entir...
Infiltration Testing Requirements
a. Install casing (solid 4-6 inch diameter, 30” length) to 24” below proposed SMP bottom
(see Figure D-1).
RE: Design Of Dry Wells
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Design Of Dry Wells
RE: Design Of Dry Wells
Yes, that is my interpretation.