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Post Construction Water Quality BMP's
- 1. Georgia Stormwater Management Manual Post Construction Water Quality BMP Overview June 16, 2009 Gil Werntz (912) 897-7813 [email_address]
- 2. clay Is this how you feel when you think about stormwater quality?
- 5. Wet Ponds
- 8. Wet Pond
- 20. Sand Filter
- 30. Enhanced Swales
- 33. Enhanced Swale Dry and Wet
- 36. Filter Strip
- 40. Grass Channels
- 44. Organic Filter
- 60. Porous Concrete
- 64. Modular Porous Pavement Systems
- 76. QUESTIONS?
Editor's Notes
- Intro myself.
- This is how I felt after researching this stuff for a few days.
- The Blue Book is legislatively mandated in parts of the state. So far along the coast, Glynn County and possibly Chatham County are the only communities to adopt the Manual so far. A 3 rd volume is in preparation which will reportedly take a closer look at proprietary BMP’s, particle size issues and possibly have more relevant coastal material. I’m not sure when it is due. I expect that more communities in the state will begin to fall back on this document. Savannah, for instance, is faced with the expiration of it’s TMDL permits in 2010, and they intend to have a new stormwater quality ordinance in place before that occurs. A comment or two about varying regulation is different jurisdictions.
- All of these with the exception of the sand filter are primarily biological. Discuss treatment train approaches.
- Pollution removal comments. Discuss the difficulty of sampling. Issues with repeatability. Discuss design points like overflows, safety benches, etc.
- Wet ponds needs a sufficient drainage area to maintain the wet pool. Discuss studies indicating high toxin levels in ponds in a number of locations. Discuss underground retention as a possible way to alleviate temperature issue. Discuss maintenance issues in a generic way.
- Tons of good information on the web.
- Also called a manufactured wetland/ Natural wetlands are an iffy BMP. Disturbances of natural hydrologies, and the addition of pollutants can damage natural wetlands.
- Sometimes called rain gardens.
- Can typically be incorporated into the landscape planning
- Very good pollutant removal.