StormWater Pros has the ability to install new drywells for property owners, property managers, developers, contractors and others. A drywell is an underground structure that disposes of storm water by percolating the water into the soil. Drywells receive water directly from a surface or connected invert pipes and use the influence of gravity and head pressure. Some drywells are simply excavated pits backfilled with gravel or rip rap. More advanced drywells contain a large interior storage volume with a use of precast concrete chambers. New dual chamber systems use two (2) concrete chambers with one being used a filtration chamber to protect the actual drywell chamber.
StormWater Pros’ series of Purewell drywell designs maximize performance and longevity along with added affordability. Full drywell design details are available for reference and plan specification for engineered drawings. Our mini-drywell design is excellent for existing sites looking to solve minor drainage issues. Please contact us to see how our drywell designs can best meet your needs.
*Need to attach CAD and PDF files of drywell designs
ADEQ (Arizona Department of Environmental Quality) regulations state that all drywells need to be registered with the ADEQ. StormWater Pros performs this required registration for new drywells and old, unregistered drywells. Upon request we can verify if any existing drywells on a property are registered with the ADEQ. Should registration be needed, StormWater Pros can prepare and submit the necessary documentation to properly register your drywell.
The ADEQ (Arizona Department of Environmental Quality) has specified closure procedure to follow to abandon drywells. Abandonment is sometimes required when sites are re-developed, facilities change, or simply the drywell is no long needed. StormWater Pros can ensure the proper abandonment procedure is followed and performed in the abandonment of your drywell. We can also submit all the necessary documentation to the ADEQ to ensure it is properly closed out with the ADEQ. Please contact us for a cost proposal for this service.
Drywell Percolation Testing
A drywell percolation test is performed by injecting a certain amount of water into a drywell to help determine the rate at which the drywell percolates water into the ground. The rate at which the drywell percolates water is called the drywell’s “Percolation Rate”. These tests are performed by using either the “Constant Head” or “Falling Head” methods. These percolation rates give users a good idea of functionality of the drywell. Some municipalities require percolation tests to be performed on newly installed drywells. By performing percolation tests on existing drywells an owner can know if the drywell is still in proper operation. Each percolation test is monitored by our engineering staff and comes with a detailed report that determines final percolation rates. Reports are stamped and approved by a licensed engineer should that be desired or required by the local municipality. Please contact us for cost proposals for this service.
Existing Drywell Retofit
Many drywell owners or users do not understand that each drywell has a defined life-span. The life-span of a drywell can depend on volume, application, and consistent maintenance. Lack of maintenance for drywells in certain applications can dramatically shorten the life span of a drywell. In our experience, single-chamber drywell systems in asphalt driveways meet this criteria. For this reason, many municipalities shy against this type of drywell application in their design manuals.
Drywells that have met or are near the end of their life-span tend to drain water at slower rates and leave standing water for longer periods of time in the drainage area. Unfortunately cleaning & maintenance cannot always successfully restore the drywell to proper operation. Fortunately through the “retrofit” process these older single chamber systems can transformed into dual chambers systems with an install of a new adjacent drywell. In this process, the new adjacent drywell is connected to old chamber via PVC piping. The old drywell becomes a filtration chamber with a filter screen and all water sent into the new drywell to be disposed of into the ground. We are able to make adequate use of the old, nonfunctioning drywell and provide a new system with a longer life span. Should you need an evaluation of an old drywell draining water at slower rates, please contact us for our professional evaluation.