2019_05-28_PWETCpacket - Laserfiche WebLink

Home

2018 MS4 Annual Report Post Construction Activities Stormwater Best Mangy Stormwate Stormwater ponds are a versatile stormwater tures and stores stormwater runoff to reduce v stream, using biological, physical, and chemical pi from surface water. Two types of stormwater porn • Wet ponds or stormwater wetlands have a p surface inflow balanced by outflow. Their pr rather than manage volume and flow, as se( flows into a storm sewer or stream. • Dry ponds primarily manage volume and flc excess water and allowing it to discharge ini Pollutants and sediment do settle out, but b Stormwater ponds need to be inspected and ne ality. They should be inspected quarterly at a min recent or recurring issues. An inspection form can Wet Pond/Wetland Dry Pond Stormwater Pond Inspection Form To be completed quarterly and saved for your records. BMP Name/location: Inspectors: Surmunding land use: Date Date of last rainfall: Wet PondlWetland or Dry Pond (circle one) Maintenance Item Condition (Excellent, Comments Good Fair, Poor)* General Condition & Debris Pond and surrounding area clear of litter and vegetative debris Condition of culverts / outlets / overflow spillway Removal of sediment buildup at Wets, outlets, and pretreatment structures Stable soil structure or remedia- tion of erosion at inlets, outlets, basin slopes Wet Pond / Wetland Invasive species** / other unde- sirable vegetation removed Plant composition is according to operation and maintenance plan Current water depth (inches), adequate depth for plant species Dry Pond De -waters between storms within 48 hours, no remaining wet spots or standing water Turf grass height is maintained at less than 6 inches Adequate vegetation, undesirable vegetation removed * Items in Fair or Poor condition should be addressed through maintenance activities as soon as possible. ** Invasive species include buckthorn, garlic mustard, purple loosestrife. Further information on inspection & maintenance of stormwater ponds can be found in the Minnesota Stormwater Manual, under "Operation and maintenance of stormwater ponds." iwater Best Management Practices: Bioretention Basins asins are a stprmwater best management practice (BMP) that controls the , and quantity of surface water after a storm, using engineered or mixed s to capture and infiltrate runoff. There are two primary types of bioreten- re commonly found in Roseville: asins reduce immediate strain on the sewer system after a storm by control- face ontrol£ace water flow rate and increasing water quality. Once the water is filtered soil, an outflow pipe drains into the storm sewer or other water body. basins similarly control the flaw rate and quality of surface storm water. rain gardens, these basins allow the water to infiltrate through the soil and o the local groundwater instead of being carried away. asins have vegetation and soils that need to be inspected and managed reg - roper functionality. They should be inspected quarterly at a minimum, and the BMP has recent or recurring issues. An inspection form can be found X this page. =filtration Basin ao .of•oed ]filtration Basin Primary Concerns Sedimentation and erosion are the most common issues with bioretention basins in Roseville. Inlets, outlets, and pretreatment structures should be clear of sediment in order for the BMP to function properly. Standing water in the basin is an indicator of poor in- filtration, likely due to sedimentation, and should be immediately addressed. City Code ordinances regarding stormwater best management practices can be d in Chapter 803 of the Roseville and particular ordinances re- ing erosion and sedimentation ml can be found in 803.04. Accord - ;o city code, inspection and rtenance of bioretention basins other stormwater BMPs are the onsibility of the property owner, negligence will result in a Notice iolation, followed by other enforce t measures if necessary.