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__°_ _§__ _@__ _°__ _ﬁ _Q__ _R__ acre bale BEST MANAGEMENT PRACTICE channel concrete construction County Conservation District CROSS SECTION culvert depth design storm detention detention basin diameter dike downstream drainage area elevation embankment emergency spillway Env-Ws erosion control excavation feet ﬁ_ ﬁ__ FIGURE flow geotextile gravel Hampshire I'II II'I I'II II'I I'II II'I inches inlet installed loam material maximum method minimum mulch permit pipe pollution pond post-development principal spillway protection Q___ rainfall riser rock riprap Rockingham County Conservation runoff RUNOFF CURVE runoff water sediment trap seeding side slopes silt fence Soil Conservation Service Source stone storage stormwater stream structure subsurface drains surface runoff surface water swale Table temporary topsoil USDA Soil Conservation vegetation velocity water quality waterway