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Terrace Design Illinois NRCS -version 2.08(7/04)-R.Book <br /> Date 04/30/22 Sec. 13 Designed by Rob Meats <br /> Landuser Heartland A Twp. 17N Checked by <br /> Location Lake Decatur WS Range 3E Approved by <br /> Basin ID 113 <br /> Design Storm 10-year V I <br /> State ILLINOIS <br /> Design Rainfall in. 4.45 <br /> County ^"ncoN Direct Runoff in. 2.01 <br /> Runoff CN 75.0 Sediment Stora e(in.) 0.34 <br /> Soil Loss(Tlac) 5.0 Water Storage in. 0.84 <br /> Dewater time(hr) IZ .i Total Storage in. 1.19 <br /> Re d.Volume cu.ft. 10932 <br /> Watershed Entry: Length&spacing . Release Rate efs 0.306 Settlement Allowance <br /> �ro • 10.0 <br /> Length(ft) 345.0 <br /> Spacing(ft) 320.0 Terrace Front Slope Length(ft) 7 Terrace Type: <br /> Acres 2.5 Channel Bottom Width(ft) 3 Broadbase <br /> Est Update Sketch } _ <br /> Ground Slope(%) F 0.6 _____._ ___.I Ridge Outside none <br /> _ Storage Area <br /> SURVEY DATA: <==Offset Spacing(ft) Instrument Height(HI)= 8.90 <br /> -_ -- ---.-- Optional Channel Constructed <br /> STA Grade Rod v Offset Cut Fill Ride Rod Interactive Volume Calculation: _ l <br /> 0+25 5.9 OA 5.9Trial Ridge Rod <br /> 0+50 6.4 0.6 6.0 *Select Trial Ridge Rod so that the Storage. <br /> 1+00 7.9 1.0 6.0 meets or exceeds Tar et. <br /> 1+50 6.4 0.6 60 Storage cu.fL Tar et <br /> 1+80 5.9 0.0 6.9 11,8591 10,932 108% <br /> Terrace Height ft 2.6 <br /> without settlement allowance or freeboard <br /> 33 cu. d. CUT <br /> Cut/Fill Ratio Est.1 0.40 1 83 cu. d.FILL <br /> Tile Outlet Scheme Orificing W <br /> Tile Material CPT <br /> Interactive Tile/Orifice Sizin <br /> Orifice Depth(fQj3 <br /> Min.Orifice Diameter in. 2.19 <br /> Corrected Orifice Dia. in. 2.5 <br /> Corrected Flow this basin cfs) 0.360 <br /> +Q flow from other terraces if an <br /> Total Tile Flow(cfs) 0.360 <br /> Tile Dia. in. Min.Slope% Velocity ftls <br /> 4 4.77 4.13 <br /> 5 1.45 2.64 <br /> 6 0.55 1.84 <br /> 8 0.12 1.03 <br /> Oseeding acres(if applicable) ob Sheet 600-1_(2.D <br /> Select riser type: Q Offset Q Inline <br /> Min. RiserDia.1 5 in. <br /> Use Riser Dig. 61n. Minimum slope at which the the size will handle the total tile flow <br />