Sheetflow Construction Erosion and Sediment Control

July 26, 2019

Down the Drain it Goes

Photo: David Jenkins

Then the sediment washing off of the uncovered stockpile drains into a catch basin which drains into a small salmon stream.

July 23, 2019

Lobster Protection in Portland, Maine

In Washington, it’s salmon protection.

March 8, 2019

Curb Inlet Protection

According to the Minnesota Stormwater Manual:

“Inlet protection devices intercept and/or filter sediment before it can be transported from a site into the storm drain system and discharged into a lake, river, stream, wetland, or other waterbody.

These devices also keep sediment from filling or clogging storm drain pipes, ditches, and downgradient sediment traps or ponds.

Inlet protection may also include placement of a barrier to create a bypass of an inlet transferring flow downstream to a sediment trap, basin, or other inlet discharging to a non-critical area.”

Nothing wrong with sediment control BMPs, as they are necessary tools in an effective erosion and sediment control system.  However, these do not “filter” sediment. 

When properly installed, these allow for ponding of water which allows larger sediment to settle out, keeping it out of the storm system.  This is a good thing, but doesn’t necessarily prevent water quality non-compliance.   

I do like this statement in the manual : “Caution: To the extent feasible, erosion prevention practices such as stabilization are preferred to sediment control practices.”

In my world, where we have to meet a turbidity effluent limit of 25 NTUs, stabilization and stormwater management are the primary methods used to meet strict turbidity limits.  

March 1, 2019

Managing Construction Projects to Prevent Sediment Trackout

I originally submitted this abstract for the 2019 IECA Denver conference . It was not accepted as a presentation but as an article in the October 2018 edition “Environmental Connection Magazine”.

Abstract
Sediment tracking from construction sites onto public roads and highways is a continual source or frustration for both regulators and contractors. The standard best management practices (BMPs) available, such as stabilized construction entrances and sweepers, often don’t work at all and, at best, only reduce total sediment by 30-50% which is inadequate for preventing water quality violations. In addition to water quality problems, sediment tracking onto roadways can generate dust, which may violate clean air standards and cause unsafe conditions, especially on highways.
This paper will discuss BMPs, methods, and procedures, which can be used by contractors to prevent sediment from being tracked onto roadways in the first place. In addition, ways to significantly reduce sediment loss will be presented. Some of these methods include:

• Passive tire baths
• Various tire washes
• Keeping vehicles of dirt
• Vacuum vs. mechanical sweepers
• Road washing
• Contract specifications

Each method will be discussed with pros and cons, design information and contract specifications.

The full magazine can be found at:
Environmental Connection, October/November 2018, Volume 13, Issue 4.

The article is attached below:

December 22, 2013

Utah State University Extension Online Landscape Course

April 27, 2013

Airport Embankment Project Tests Erosion Control Options

While building an embankment for a new runway at the Seattle-Tacoma International Airport in Washington, the Port of Seattle is also developing some new erosion control measures to help protect the water quality of nearby creeks and potentially boost compliance with state water-quality standards beyond what is required.

“We want to go the extra mile in keeping sediment on-site and protecting water quality during construction,” maintains David Jenkins, erosion control and stormwater engineer for the port. “We are shooting for a system that will be even better than the prescribed state guidelines and that will fit right in with the way we are building the embankment.”

Read the full article in the Erosion Control Magazine

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