2631 WALNUT ST JACKSONS 2025-07-28

I I No. 9—Wet Bio rfiltration Swale IMaintenance Defect or Condition When Maintena:.:-:e is Recommended Maintenance to Component Problem Needed Correct Problem I General Sediment Accumulation Sediment depth exceeds 2-ii aches in Remove sediment deposits in 10%of the swale treatment c.;rea. treatment area. Water Depth Water not retained to a depth of Build up or repair outlet berm so about 4 inches during the wet that water is retained in the wet I season. swale. Wetland Vegetation becomes sparse and Determine cause of lack of vigor Vegetation does not provide adequate filtration, of vegetation and correct. Replant I OR vegetation is crowded o.ii by as needed. For excessive cattail very dense clumps of cattail,which growth, cut cattail shoots back do not allow water to flow through and compost off-site, Note: the clumps. normally wetland vegetation does I not need to be harvested unless die-back is causing oxygen depletion in downstream waters. Inlet/Outlet Inlet/outlet area clogged with Remove clogging or blockage in I sediment and/or debris. the inlet and outlet areas. Trash and See "Detention Ponds"(No. 1). Remove trash and debris from wet Debris swale. I Accumulation _ Erosion/Scouring Swale has eroded or scoured due to Check design flows to assure flow channelization, or higher flows. swale is large enough to handle flows. By-pass excess flows or I enlarge swale. Replant eroded areas with fibrous-rooted plants such as Juncus effusus (soft rush) in wet areas or snowberry I (Symphoricarpos albus) in dryer areas. I I I I I I I 4-40 Volume V—Runoff Treatment BMPs February 2005