FW: Treatment Berms - SD2 Stormwater Infrastructure 1:10
Wednesday, January 19, 2011 at 3:19PM 
Treatment Berms are intended to be multi functional elements that would be used on a slope such as near slopes that occur near some of the main corridors in Auburn. Some of these appear to drain into wetland areas while others into ditches used in stormwater infrastructure. The berm would be composed of engineered and or natural material layered in such a way as to promote microbial growth and chemical degradation. The berm would form a trench between the polluting surface and the receiving feature. Water could accumulate in this trench where wetland and water tolerant vegetation could reside. The vegetation would not only help to reduce flows through transpiration, but also treat pollutants through uptake. Water would then trickle through the berm’s treatment layers for further purification. The berm would be planted with medium-large vegetation to small vegetation in order to help stabilize the bank and create a visual and or auditory boundary. The top of the berm would need to be lower than the runoff surface or contain an overflow to prevent flooding of occupied spaces. Depending on conditions some structure may also need to be investigated to support the back slope. The treatment subgrade for this system needs to be sized, and oriented as well as media needs to be selected. Wetland and berm vegetation can be selected based on aesthetics, noise dampening qualities and hardiness. Ideally, these systems would require little to no maintenance especially if placed along SR 167.
Julee Trump
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