Based on aerial photos, water body layer, and land use layer of the watershed, the percentage of each land use area with retention ponds implemented was calculated. Based on the results, it was assumed that retention ponds were applied in 60% of high intensity areas (including high density residential, commercial, and industrial areas), 50% of low intensity areas (low density residential areas), 95% of water/wetland areas, and 40% of other areas (including forest/woods,
agricultural, and grass/pasture areas).