The difference between dry wells and french drains are that dry wells move water into the soil, while french drains are a more sophisticated drainage system that route runoff towards another location on your property where the surface water will be drained.

How big of a drywell do I need?

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.

Does a dry well need a vent?

To address issues such as backup and escape route for air, a dry well needs to be vented. Venting can prevent imbalance in pressure by releasing excess water or trapped air, preventing water infiltration into the house.

Do dry wells cause sinkholes?

Can A Dry Well Cause A Sinkhole? They can, if the dry well isn’t installed correctly, that is. You need to make sure the well is packed well and that you have a good barrier as well. If you don’t do this then the soil could sink and cause a sinkhole.

Are dry wells a good idea?

Dry wells can be a safe and effective way to manage stormwater and recharge groundwater as long as: The stormwater is not contaminated. Appropriate pretreatment is used. The dry wells are installed in suitable locations.

How much water can a drywell hold?

Each dry well tank holds up to 50 gallons of detention volume per unit.

How do you dig a hole for a dry well?

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 big should a dry well be for washing machine?

Dig a circular hole, 4 feet around and 4 feet deep, where the dry well will be located. Dig a 1-foot-deep trench from the dry-well location to where the pipe from the washer machine water will run out from the house. Fill 1 foot of the hole with 1 1/4-inch crushed rock, and smooth level with a rake.

Do dry wells work in clay?

Dry wells are good for draining stormwater, but they work better in dry and grainy soils than in clay. To check your clay soil will drain, dig a 4-foot deep hole and do a percolation test with 5 gallons of water. If it drains slowly or not at all, then your clay soil isn’t suitable for a dry well.

What is a French drain dry well?

A French drain is a type of drainage trench that collects water and directs it downhill. A French drain needs a termination point to release all of the water it collects. A dry well is a great termination point for your French drain.

What is a French drain system?

A French drain is a trench filled with a perforated pipe and gravel that allows water to drain naturally from your yard. Depending on the size of your yard and the scale of your drainage issue, you can purchase the pipes and equipment to create a French drain yourself.

How do I install a dry well sump pump?

Use pointed shovels to dig a 4-feet-deep hole for the dry well. Fill the bottom of the hole with crushed stone. Line the bottom and sides of the hole with landscape fabric, then add more stone. Lay 1½-inch-diameter PVC pipe in trench extending from the sump pump discharge to the hole.