SWMM - LID Controls - Rain Garden

Rain Garden - are a type of bio-retention cell consisting only of the engineered soil layer, with no gravel layer below it

Schematically:

• SWMM
  • Storage
    • Storage Height - Gravel layer thickness or Rain Barrel height
    • Clogging Factor - Total volume of treated runoff required to completely clog the bottom of the layer divided by the void volume of the layer
    • Voice Index - The volume of void space in relation to the volume of solids in the layer
    • Infiltration rate - The rate at which water penetrates the native soil below the layer
  • Soil
    • Field Capacity - Volume of pore water in relation to total volume after soil drains completely
    • Hydraulic Conductivity - Hydraulic Conductivity for fully saturated soil
    • Conductivity Slope - Slope of the curve of log (Conductivity) versus soil moisture content (dimensionless)
    • Thickness - Thickness of the soil layer
    • Wilting Point - Volume of pore water in relation to total volume for a very dry soil, where only bound water remains
    • Porosity - The volume of pore space in relation to the total soil volume
    • Suction Potential - The average value of soil capillary suction along the wetting front
  • Surface
    • Vegetable Coverage - Vegetal Coverage
    • Slope - Surface slope
    • Side Slope - Slope of the side walls of a cross section of a ditch
    • Storage Depth - Storage Depth
    • Surface Roughness - Roughness