Sheet Flow Construction Erosion Control

December 23, 2021

Catch Basin Protection

Title: Down the Drain-Catch Basin Protection

Topic: How do you project a catch basin during construction? Is a catch basin insert enough? What are you trying to protect it from-sediment, turbidity, gravel? How to you protect non-standard catch basins, slot drains, curb drains? What about covering them to keep everything out? Should you use plugs in the storm pipe? These and other questions will be discussed in this brief overview of catch basin protection.

Speaker: Dave Jenkins, CPESC, has over 25 years experience in heavy civil, public works construction as an erosion control and stormwater engineer, resident engineer, and construction inspector. He is trying to retire, but feels the need to keep going back to work and is closing out a habitat restoration project for the Port of Seattle.

Date: 2021 December 20, 12:15 to12:45pm

Organization: Pacific Northwest Chapter-International Erosion Control Association Website:

September 21, 2020

Steel Plate Construction Access

Video: David Jenkins

This is a steel plate construction access that we built across a live stormwater swale. We have installed compost socks along the edge to keep construction runoff out of the swale.

September 17, 2020

Compost Sock Catch Basin Berm

Photo: David Jenkins

This compost sock catch basin berm works well as it is heavy enough to stick to the asphalt. Note the tear and I would keep an eye on it during inspections.

September 16, 2020

30 mil PVC

Photo: David Jenkins

Catch Basin Covered with 30 mil PVC – This catch basin in a live storm system sits right in the middle of an actively worked area. Plugging the discharge pipe wasn’t possible due to depth and access of the manhole. The solution is placing heavy 30 mil PVC liner material under the grate then telling all of the workers that they are not to poke holes in it when the area floods from rain.

September 7, 2020

Trash Bag Catch Basin Cover

Photo: David Jenkins

In an emergency, a heavy duty trash bag can provide catch basin protection until a more permanent BMP is installed.

September 3, 2020

Source of the Foam-Dewatering

Photo: David Jenkins

The contractor has to dewater to dig an excavation for an electrical duct bank-the water table is high. The soil is mildly contaminated so all of the water has to be treated in a Chitosan-enhanced Sand Filtration (CESF) system with granular activated carbon (GAC) before discharge to the waterway. The contractor set the well points, hooked them up to the pump but not the CESF system. So, water went directly onto the ground from the pump and into the nearest catch basin. The foam is from the silt in the soil that has been aerated by the pump.

September 2, 2020

Why is There Foam Around the Catch Basin?

Photo: David Jenkins

Why is there foam around the catch basin? I will give the answer tomorrow.

August 3, 2020

More Infiltration

Photo: David Jenkins

Here is a good example of using infiltration to manage excess, relatively clean, stormwater during construction. When water builds up around the covered catch basin, it 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.

July 30, 2020

Compost Sock Maintenance

Photo: David Jenkins

In order to contain dirty runoff, Compost sock maintenance is critical. Replace the sock or repair the tear with plastic or netting. Place safety cones or candles around the catch basin.

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