Sheetflow Construction Erosion and Sediment Control

November 6, 2019

Sometimes There’s Just Too Much Rain

Filed under: Photo — Tags: , , , , , , , — Sheetflow @ 1:08 pm
November 6, 2006 Sea-Tac, Washington Photo: David Jenkins

We were building a new runway, had several hundred acres of open ground, when the big rains came. We were using the stormwater ponds to collect all of the water for a 10 year 24 hour storm event, or 3 inches of rain. All of the water in the ponds was being treated with chitosan-enhanced sand filtration systems before discharge.

The storm of November 6, 2006 was something over the 50 year 24 hour event and something under the 100 year 24 hour event. With the rainfall and the pond over topping, water was discovered draining from the base of the pond. Rock and ecoblocks were placed as an emergency fix to keep the pond from a catastrophic failure. All of the dirty water drained to a creek, but, nothing we could do.

September 19, 2013

Lessons in Solving Big Weather-Related Problems

Grading and Excavation Contractor
September-October 2003

When it comes to controlling erosion and sediment in bad weather, construction of a third runway at Seattle-Tacoma International Airport, near Seattle, WA, qualifies as a genuine challenge. Providing a foundation for the 8,500-ft.-long, 150-ft.-wide runway in the hilly terrain will require an estimated 17 million yd.3 of fill. Since construction began in 1997, about 5 million yd.3 have been placed. It will take a large fleet of dump trucks, running 20 hours a day, three and a half years to bring in the rest. Then there’s all that wet weather the area is famous for, especially in late fall and winter. Two years ago, for example, the project was drenched with about 5 in. of wind-driven rain in one 36-hour period. (more…)

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