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Terrace Design Illinois NRCS -version 2.08(7/04)-R.Book <br /> Date 04/30/22 Sec. 13 Designed byl Rob Meats <br /> Landuser Heartland A Twp. 17N Checked by <br /> Location Decatur Range 3E Approved by <br /> Basin ID 1A _ <br /> Design Storm 10-y <br /> ear <br /> ILLINOIS • 10- ear • <br /> Design Rainfall in. 4.45 <br /> County nnAcoN Direct Runoff(in.) 2.01 <br /> Runoff CN 75.0 Sediment Stora a in. 0.34 <br /> Soil Loss(Tlac) 5.0 Water Storage in. 0.66 <br /> Dewater time(hr) G .� Total Storage in. 1.01 <br /> Re d.Volume cu.ft. 9367 <br /> Watershed Entry: Length&Spacing •i Release Rate cfs 0.515 Settlement Allowance <br /> so •' 10.0 <br /> Length(ft) F-3-660-0 <br /> Spacing(ft)Lmd <br /> Terrace Front Slope Length(ft) 7 Terrace Type: <br /> Acres Channel Bottom Width(ft) 3 Broadbase <br /> Est Update Sketch ! _ <br /> Ground Slope(%) 2.6 Ridge Outside none - • <br /> Storage Area <br /> SURVEY DATA: r_=Offset Spacing(ft) Instrument Height(HI)= 6.80 <br /> - -- ---I --.-- Optional Channel Constructed <br /> STA Grade Rod V1 Offset Cut Fill Ride Rod Interactive Volume Calculation: <br /> 0+70 4.3 0.0 3:9 Trial Ridge Rod 7747721 <br /> 1+00 4.8 0.4 39 *Select Trial Ridge Rod so that the Storage <br /> 1+50 5.7 0.3 3.9 meets or exceeds Tar et. <br /> 2+00 6.2 0.6 3.9 Storage cu.fL Tar et <br /> 2+60 5.3 0.8 39 10.3721 9,367 111 <br /> 3+00 1 4.8 0.6 3.9 <br /> 3+30 4.9 0.0 3.9 Terrace Height ft 2.6 <br /> 3+80 4.2 0.0 3.9 without settlement allowance or freeboard <br /> 45 cu. d. CUT <br /> Cut/Fill Ratio EstT 0.17 266 cu. d. FILL <br /> Tile Outlet Scheme Orificing • <br /> Tile Material CPT •i <br /> Interactive Tile/Orifice Sizin : <br /> Orifice Depth(tL)j 3 <br /> Min.Orifice Diameter in. 2.84 <br /> Corrected Orifice Dia. in. $ <br /> Corrected Flow this basin cfs 0.519 <br /> +Q flow from other terraces if an <br /> Total Tile Flow cfs 0.519 <br /> Tile Dia. in. Min.Slope% Velocityft/s <br /> _ 4 9.90 5.95 <br /> 5 3.01 3.81 <br /> _ 6 1.14 2.64 <br /> _ - 8 0.25 1.49 <br /> 10 0.07 0.95 <br /> C seeding acres(if applicableliob Sheet 6Q0-1 (2)1 <br /> SelBCt riser tVDe: Q Offset Q Inline <br /> Min. Riser Dia.1 5 in. <br /> Use Riser Dia. 6 in. Minimum slope at which the tile size will handle the total tile flow <br />