Stormwater management exam questions fully solved & updated 2024

Three criteria for wetlands hydrophytic (water loving) plants, hydric soil, and flooded during certain times of the year (hydrology) Ohio EPA permits cover construction activities, municipal projects, and industrial projects CWA stands for clean water act WWTP stands for waste water treatment plant WTP stands for water treatment plant what is the goal of the CWA of 1972? improve water quality of our surface waters Two main components of stormwater urban runoff and construction activities stormwater water from rain and snowmelt that flows over impervious surfaces (i.e. parking lots) and picks up pollutants (trash, sediment, oil) that harm surface water resources like rivers and lakes BMP best management practices to filter out or prevent pollutants Regulatory authority for stormwater management in Ohio? Ohio EPA, Division of Surface Water, Stormwater Management Section. with technical support from the ODNR Division of Surface Water LID low-impact development; mimic natural hydrology and use IMPs (integrated management practices) such as swales, filter strips, bioretention) conservation development preserve natural features that are already there objectives for development preserve natural drainage, minimize impervious surfaces, improve degraded streams, control pollution sources, assure access to stormwater system, control erosion/sediment impacts, manage post-construction runoff setback widths of wetlands Class 3 (largest wetlands) 120 ft, Class 2 (med size) 75 ft; Class 1 (small, most common type) 25 ft detention ponds (stormwater basins) collect stormwater, drain stormwater slowly;good for flood control retention ponds (water quality ponds) retain stormwater, can improve water quality and provide flood control WQv. (ac-ft)=C0.75A/12 water quality volume formulae C is the runoff coefficient stormwater basins/detention ponds require maintenance to make sure outflow orifice (opening) doesnt get clogged infiltration trench rock filled trench; most effective postconstruction stormwater practice, good for small sites sand filters good for treating all pollutants except nitrates bioretention utilize soil media to retain stormwater and allow it to filter out slowly, good for small sites with slopes or many impervious surfaces flash flooding fast flood that happens quickly and disappears quickly heavy rain, or large snow melt postconstruction management practices reduction of impervious areas low impact development conservation development wetland setback stream setback structural practices water quality ponds infiltration trenches permanent runoff controls grassed swales level spreaders rock lined channels rock outlet protection diversions terraces subsurface drainage temporary diversions work better than silt fences, especially on larger sites temporary runoff control examples rock check dam slope drain temporary diversion stream utility crossing temporary stream crossing water bar de-watering measures temporary runoff strategies keep water clean, manage on-site sediment