complete drainage report rev 9

Docusign Envelope ID: E802A2F1-2485-417E-948D-E0A4008C75BD Porous Pavement #3 System 3 collects water from the Kennel parking lot and adjacent grass areas. contributing areas to the porous pavement area is 2.97: 1 Areas contributing 21910 sf Porous Pavement 5500 sf Lawn and other contributing areas 16,410 sf ratio 2.98:1 The ratio of other The system will have soil replacement with a permeability of 20 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 half of the Building A parking lot as well as adjacent grass areas. ratio of the total areas to the porous pavement area is 2.99 The system will have soil replacement with a permeability of 4 inches per hour with a factor of safety of 2: 1 Areas Contributing 49050.0 sf Porous pavement 12,268.7 sf Lawn and other contributing areas 36781.3 sf The Ratio 2.99 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. 8