Sheetflow Erosion Control Erosion Control for the CESCL

March 30, 2020

Before and After

Photo: David Jenkins
Photo: David Jenkins

The contractor had to connect a new storm system from up the hill into an existing catch basin in the foreground. After they completed the connection but before paving, they covered the pipe run with plastic and sand bags to protect from dirty water entering the catch basin. Work was completed during dry summer weather. Paving took place a couple of months later.

March 26, 2020

Roof Drains and Bare Soil

Photo: David Jenkins

Thousands of gallons of clean rainwater draining off the roof deck onto bare soil turning into thousands of gallons of water that’s too dirty to discharge without treatment. With pre-planning, a temporary collection system could have been developed and installed to contain, collect and convey the clean water to an existing drainage system. Without such a system, the dirty water had to be treated chemically to reduce the turbidity enough to discharge to the storm system.

March 19, 2020

New Storm Manhole

Photo: David Jenkins

Questions to ask: Is this an existing manhole? If it is, is it connected to the storm system? Is this a new manhole? Is it connected? Is everything grouted? Since this is below existing, bare grade, any water that drains to this manhole will be very dirty. If the system is live, and the manhole is not grouted, all of the dirty water will end up somewhere it shouldn’t.

October 4, 2019

Broken Waterline

Photo: David Jenkins

This is caused by a broken 16 inch waterline. Fortunately, all of the muddy water was contained in a 72″ storm pipe with a valve. Water was then pumped to a Chitosan-enhanced Sand Filtration (CESF) system for treatment to 5 NTUs for discharge to a creek. Knowing this project was going to be constructed over several winter seasons, we specified the CESF system in the contract.

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