As I understand SWMM RUNOFF, depression storage is used to pond water on the pervious ground for infiltration during subsequent timesteps. breeding cycles of amphibians, insects, Killifishes, etc or use of puddles for irrigation), I'd forget about the depression storage component and just deal with the larger components of the hydrologic cycle (Runoff, Infiltration/percolation, Evaporation, Evapotranspiration). Unless you are concerned with something specific that happens in or with the puddles (i.e. is it flat as a plate with 1 to 2 meter deep depressions like parts of the Canadian prairie - likely not, unless your part of South Africa was ever glaciated or at the bottom of a lake or sea). ![]() ![]() Do you have actual rainfall, runoff/streamflow, groundwater data for your catchments of interest, or are you performing a desktop analysis? What is the nature of the contryside that you are modelling ? (i.e.
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