Erosion Control Gallery
Erosion and Sediment Control Measures (Best Management Practices or BMPs)
Construction erosion control Best Management Practices or BMPs are intended to prevent soils from eroding and polluting nearby waterways. This is accomplished by various practices and structural controls. Practices could include stopping earth moving during heavy rain storms, and structural controls largely provide mechanisms to block and/or filter muddy water before it enters nearby waterways.
Below are some photos of erosion, muddy water, and examples of different types of BMPs that ACP may use, and some notes about what is going on in each photo.
When you're out in the field, look for issues like these and take lots of pictures and take detailed notes!
Erosion and Muddy Water
These are some examples of conditions that indicate that the erosion and sediment control measures in use just aren't sufficient.
Sediment plumes like this are an obvious sign that something is wrong upstream.
Erosion gullies and rills like these are also signs that measures need to be put in place to protect our streams from excessive sediment.
Silt fence is designed to allow water to flow through slowly, with the idea that sediment will drop to the bottom and stay behind the fence keeping it from entering nearby streams.
The fence on the left is clearly overwhelmed.
This fence is not sufficient as you can see water going around the sides, and some very dirty water still flowing down the ditch behind the fence.
This fence has been knocked down and is no longer doing the job it should, the obvious erosion onto the street will be carried to a nearby stream by a storm sewer system.
This fence is not correctly staked down or trenched and buried at the bottom, rendering it useless.
This fence is oriented to hold back sediment from up the slope, as you can see by the piles of mud below it isn't working.
Coir Logs / Straw Wattle / Compost Filter Socks
These wattle are not overlapping, not sufficiently staked, and there are obvious gaps and breaks.
These wattle are not dug in correctly and muddy water will likely flow right underneath.
This wattle is both undersized (it should go up the slopes on both sides further) so that water is escaping around the sides, but also is not staked or dug in correctly.
For various types of inlets to storm sewer systems that drain project areas, systems like those above are placed around them to prevent untreated water from going directly into the stream.
An undersized wattle that is being overwhelmed by the pictured flow.
This is a correctly done inlet that appears to be keeping material out.
Straw bales are substantially less effective than the log like wattle type products.
This is an inlet that has no protections whatsoever.