Sheetflow Erosion Control Erosion Control for the CESCL

December 27, 2019

Detroit Riprap

Detroit riprap located at Milepost 25 on Highway 89, just under 40 miles east of Kanab, Utah. The hike takes about 10 minutes. I found a couple of early sixties Ford Falcons, a mid-sixties Lincoln, some mid-sixties Chevy Impalas, and a Corvair with the engine. I couldn’t identify the other cars. Here is the map: Catstair

Photos: David Jenkins

March 8, 2019

Curb Inlet Protection

According to the Minnesota Stormwater Manual:

“Curb 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.  

Photo: David Jenkins

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