Low Impact Development (LID) Components
The Low Impact Development (LID) function is new to SWMM 5.0.019/20/21 and we have run many configurations and found no problem for the hydrology and hydraulics. It is integrated within the subcatchment and allows further refinement of the overflows, infiltration flow and evaporation in Rain Barrels, Vegetative Swales, Porous Pavement, Bio Retention Cell and Infiltration Trench.
You can define a variety of sub processes in each LID such as: Surface, Pavement, Soil, Storage, and Drain.
Each type of LID has limitations on the type of sub process allowed by SWMM 5. It has a good report feature and you can have a LID summary report in the rpt file and an external report file in which you can see the surface depth, soil moisture, storage depth, surface inflow, evaporation, surface infiltration, soil percolation, storage infiltration, surface outflow and the LID continuity error. You can have multiple LID's per subcatchment and we have had no issues having many complicated LID sub networks and processes inside the Subcatchments of SWMM 5 or any continuity issues not solvable by a smaller wet hydrology time step. The types of SWMM 5 LID compartments are: Storage, Underdrain, Surface, Pavement and Soil. A Bio Retention cell has Storage, Underdrain and Surface Compartments. An Infiltration Trench LID as Storage, Underdrain and Surface Compartments. A Porous Pavement LID has Storage, Underdrain and Pavement Compartments. A Rain Barrel has only Storage and Underdrain Compartments and a Vegatative Swale LID has a single Surface Compartment. Each type of LID shares different underlying compartment objects in SWMM 5.
Read more about this topic: Storm Water Management Model
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