Existing custom silt curtain stopped floating up and down with reservoir elevation

by Mel Tesema, P.E., Superintendent, McMillan Water Treatment Plant
(Washington Aqueduct Division)

In summer 2008, our existing custom silt curtain stopped floating up and down with reservoir elevation. Investigation with an underwater camera revealed that “fluid mud” had accumulated on top of the curtain restricting it from floating up with reservoir elevation. Since having the silt curtain in place is a condition of our permit, we needed to correct the problem as soon as possible. Until we get the area dredged and replace the existing silt curtain, we decided to get temporary Type-2 curtain (700 FT long 5 FT deep) to block any sediment that may pass on top of the partially submerged existing curtain.

The experts at the Granite Environmental, Inc. went beyond expectation with their technical help and recommendations. Although we did not purchase installation service, Granite Environmental, again, was there on the phone helping our maintenance personnel as they install and drop anchors for the curtain. We are very pleased with their product and service.

Mel Tesema, P.E.
Superintendent, McMillan Water Treatment Plant
Washington Aqueduct Division
U.S. Army Corps of Engineers