Revised Stormwater Management Report

DocuSign Envelope ID: DB0533B0-B14B-449D-A0A8-3B9C3C0DF5D9 Porous Pavement #3 System 3 collects water from part of the Building A roof, the maintenance building roof, the dog kennel roof, Kennel parking lot and adjacent grass areas. The majority of the drainage area is the building roof or the porous pavement surface. The ratio of other contributing areas to the porous pavement area is 2.97: 1 The system will have soil replacement with a permeability of 4 inches per hour with a factor of safety of 2. The proposed Tc for the area flowing to PP3 uses the following input Sheet flow 75 lf. @ 4% over grass 8.3 minutes Total Tc = 8.3 minutes The porous pavement system is considered green technology for both groundwater recharge and water quality. Porous Pavement system 4 Tc Computations System 4 collects water from part of the Building A roof, and half of the Building A parking lot as well as adjacent grass areas. The majority of the drainage area is the building roof or the porous pavement surface. The ratio of other contributing areas to the porous pavement area is .80. The system will have soil replacement with a permeability of 4 inches per hour with a factor of safety of 2: 1 The proposed Tc for the area flowing to PP3 uses the following input Sheet flow 70 lf @ 2% over roof .9 minutes Pipe flow 685 lf @ 2.5 fps 4.6 minutes Total Tc = 5.5 minutes The porous pavement system is considered green technology for both groundwater recharge and water quality. 7