Our project has a very small semi-permanent stream runing through it (i.e., the streams forms only in heavy rainfalls). . The water from such semi-permanent stream will be directed to a temporary sediment basin during construction and later it will be channelized underground thorugh the project and a permanent retention pond will be constructed. Now, I have not found guidance in CGP 2003 on semi-permanent streams. Are we doing the right thing? thanks
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Michael DeVuonoRegional Stormwater Leader
Arcadis North America
186 thumbs up
April 7, 2015 - 6:15 pm
I have no problem for this provided it its really only a drainage swale. If this is an actual intermittent stream, capable of supporting aquatic life, you can't detain the flow. Ultimately this decision is up to your civil engineer or hydrologist to determine the aquatic function.
83 thumbs up
April 7, 2015 - 6:29 pm
Thank you Michael, the stream is very small when it forms and uncapable of supporting aqcuatic life. Only plants used to the variation of dry-wet soil grow there and it is not even topographically noticeable in the surveys we have. I think the thing is it's naming, you just made me realize that it, in fact, is a drainage swale, but the nobody is familiar with the term around here, so the call it a semi-permanent stream :) So, I believe it is only a linguistic problem! Thanks again for your quick reply! Very much appreciated!!