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1 <br /> 1 <br /> Impervious Land Use Acres <br /> ' ROADS FLAT 0.06 <br /> ROOF TOPS FLAT 0.13 <br /> DRIVEWAYS FLAT 0.06 <br /> i <br /> Element Flows To: <br /> Surface Interflow Groundwater <br /> ' Gravel Trench Bed 1, Gravel Trench Bed 1, <br /> Name : Gravel Trench Bed 1 <br /> Bottom Length: 120ft. <br /> Bottom Width : 2.5ft. <br /> Trench bottom slope 1: 0.05 To 1 <br /> Trench Left side slope 0: 1 To 1 <br /> Trench right side slope 2: 1 To 1 <br /> • Material thickness of first layer : 2.5 <br /> Pour Space of material for first layer : 1 <br /> ' Material thickness of second layer : 1.5 <br /> Pour Space of material for second layer : 0.3 <br /> Material thickness of third layer : 1.5 <br /> Pour Space of material for third layer : 0.3 <br /> Infiltration On <br /> Infiltration rate : 4 <br /> Infiltration saftey factor : 0.25 <br /> Discharge Structure <br /> Riser Height: 4.5 ft. <br /> ' Riser Diameter: 6 in. <br /> 1 <br /> 1 <br /> 1 <br /> 110062—Serenity Meadows—Basin 2A 2 <br /> 1 <br />