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Transit Mix Concrete Co. <br /> Table G-6 <br /> Sediment Detention Basin Capacity Summary <br /> Sediment Watershed 100-yr, 24hr Sediment Total <br /> Detention Area Storm Runoff Capacity Capacity <br /> Basin (ac) (ac-ft) (ac-ft) (ac-ft) <br /> P-DET-1 112.6 11.0 2.20 13.20 <br /> P-F1 33.81 8.24 1.65 9.89 <br /> P-Plant-1 107.5 19.99 4.00 23.99 <br /> P-Plant-2 96.01 17.31 3.46 20.77 <br /> P-TEMP NA 4.5 0.90 5.40 <br /> RD-SP-1 5.05 1.55 0.31 1.86 <br /> RD-SP-2 18.14 3.83 0.77 4.60 <br /> RD-SP-3 7.02 2.01 0.40 2.41 <br /> RD-SP-4 1 12.86 3.17 1 0.63 3.80 <br /> c. Culverts <br /> Culverts will be used for the access road, natural drainages, and in limited areas as means of <br /> conveying temporary flows down steep slopes via drop culverts. The access road includes <br /> culverts at each of the stream crossings and at sag points along the road to convey the collected <br /> water from roadside ditches to the sediment basins. Culverts have been designed to convey <br /> runoff from the 100-year, 24-hour storm with various headwater to diameter (HW/D) ratios. As <br /> much as possible the approach was to use a HW/D ratio of 1.0 or less. Where significant flows <br /> were encountered, attempts were made to use multiple culvert barrels to minimize the <br /> headwater depths. Where the number of barrels grew excessive, then higher HW/D ratios were <br /> used. A summary of the culvert designs is included as Table G-7. Each culvert will utilize a <br /> circular corrugated metal pipe (CMP). Erosion protection is provided using riprap at the inlet <br /> and outlet of each culvert. Typical designs for the culverts are shown in Figure G-16. <br /> Culverts LTC-CC-2 through LTC-CC-6 are located along Little Turkey Creek or its tributaries. <br /> The flow values for these culverts were calculated for the 100-year, 24-hour flow using SEDCAD. <br /> The SEDCAD design reports are included in Attachment G-1. <br /> Hitch Rack Ranch Quarry Permit Application <br /> October 3,2017 G-24 <br />