Sheetflow Erosion & Sediment Control Heavy Civil Construction

August 3, 2020

More Infiltration

Photo: David Jenkins

Another example of using infiltration to manage excess, relatively clean, stormwater during construction. As water builds up around the covered catch basin, is flows into the area to the right and infiltrates, preventing flooding.

Photo: David Jenkins

Closeup of double plastic layers under catch basin grate and infiltration area.

July 31, 2020

Catch Basin Covered-Infiltration

catch basin covered to allow infiltration of construction stormwater in hole cut in asphalt and filled with rock
Photo: David Jenkins

This is the first project we have cut asphalt to allow construction stormwater to infiltrate. The area is paved, flat. The sweeper runs constantly but the water is still too turbid to go down the drain. The fill soil under the asphalt is sandy. If we just covered the catch basin with 30 Mil PVC, the area would just flood, then drain to another catch basin. Solution? Cut out a section of asphalt full depth to the sandy soil, fill with 3 to 5 inch rock. This way the water infiltrates but vehicles can drive over the hole. This is working really well so we will be doing this on future container dock upgrade projects.

June 1, 2020

Lake Emelia in Port Orchard

Video: Kitsap Sun

This is what happens when the stormwater pond is an infiltration pond, undersized and covered with sediment so it doesn’t infiltrate. This was a 2 inch in 24 hour storm, or about a 2 year event, which should have been pretty easily contained if the pond had been designed as a temporary sediment pond for use during construction. Also, they should have had a construction stormwater treatment system set up to treat for turbidity. There really is no excuse for this. Poor planning.

April 29, 2020

More Cool Things to do With Compost

Photo: David Jenkins

The best way to get grass growing quickly is to use soil amendment. This is composted yard waste, spread three inches thick. It will be tilled in the top six to 12 inches, track-walked, then sprayed with bonded fiber matrix, seed and 100% nitrogen fertilizer. We get the added benefit of increased water infiltration, reducing our storm water discharge volume.

June 20, 2018

Pump, Plug and Infiltration Pond Used to Dispose of Turbid Water

Construction erosion and sediment control is really just temporary management of stormwater until the permanent, post-construction stormwater system is functional. Stormwater from this 3 acre site is managed by pumping turbid runoff to an on-site, infiltration pond.

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