How deep and wide should a dry well be?
Step 1: Dig the Hole and Trench Coming out from the downspout, at least 10 feet from the foundation (and 3 feet from any property line), dig a hole about 4 feet deep and wide. With a long-handled shovel, tunnel under the sidewalk and dig a trench 1 foot deep and 6 inches wide that slopes gradually toward the hole.
How large should my dry well be?
Ideally, dry wells should be large enough to collect runoff without overflowing in typical rain events. Depending on the average amount of storm water you need to control, you can choose install a dry well that’s as small as a couple feet in depth and diameter or as large as several feet wide and several feet deep.
What do you fill a dry well with?
A drywell is used to quickly transfer excess surface water deeper into the subsoil. It can be as simple a hole dug with a post hole digger and filled with gravel and sand, or as complex as a pre-cast concrete sleeve lowered into a large hole and fed by drainage pipes.
How deep should you dig a dry well?
Dry wells are typically three feet deep and should be designed to accommodate the stormwater volume (determined in Step 3). Adjust the dimensions of your dry well as needed to fit your site.
How many gallons of water can a dry well hold?
50 gallons
Each dry well tank holds up to 50 gallons of detention volume per unit.
How much gravel do I need for a drywell?
Spread 2–3 inches (5.1–7.6 cm) of gravel over the bottom of your well. Once you reach the well with your piping, fill the bottom of your well with loose gravel. Add a few inches of gravel and spread it out by hand so that it is even and covers the entirety of your well floor.
How deep do you dig a dry well?
How much water can a dry well handle?
A typical dry well is 3’x3’x3′. This will store about 11ft3 of water, which is equal to the runoff from a 132ft2 drainage area in a storm that produces one inch of rain.