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<br />The channel area should he seeded with a native graas mixture and the <br />graaa ahould be mowed to a height of approximately 4 inches .everal times each <br /> <br />(Ill Station 21+95 to 22+35 -A48" x 40' culvert (or equivalent) .hould <br />be installed at Poplsr Street to convey Q25 . 90 cfs. <br /> <br />growlng.ea.on. <br /> <br />(5) Station 13+10 to 13+55-A 72"x 44" arch culvert (or equivalent) <br />.hould be in. taIled at Pin~ Street to convey Q25 . 135 cf.. <br /> <br />(12) Station 22+35 to 25+00 - A channel ahould be excavated with the <br />dimenaiona recOllllllended in Improvement (10). <br /> <br />(6) Station 13+55 to 14+80 - A channel should be excavated with the same <br />dimensionSllsproposedinllllprovement(4). <br /> <br />(13) Station 27+00 to 28+50 - To further increase the safety of the <br />tion dam, the spillway should be protected from erosion. A riprap lined <br />from the apillway creat to a point downstream from the toe of the dam ia <br />mended. <br /> <br />deten- <br /> <br />aection <br /> <br />recom- <br /> <br />(7) Station 14+80 to 15+20 - Sediment accumullltion ahould bc cleaned from <br />benellth the bridge and II minimum clearllnce of 3 feet should be provided to <br />cooveyQ25-130cfa. <br /> <br />(l4) Stlltion41+30 t041+70-T\iQ48"x40' eulverta (orequivaIent) shoul d <br />be inatalled lit County Road 136 to convey Q25 . 175 cfs. The area .outh of <br />the road will need to be excavated and regraded to obtain .ufficient clearance. <br /> <br />(8) Station 15+20 to 19+10 - A channel should be excavated with the same <br />dimensions aa proposed in Improvement (4). <br /> <br />Pine Rid~e Drainage <br /> <br />(9) Stlltion 19+10 to 20+70 - A 72" x 44" X UiO' arch culvert (or equivalent) <br />should be installed at the Elm I Elbert Sre..t inteuection to cnvey Q25 - DO crs. <br />The inlet will be located upstream from the II11ey between Pop tar and Elm Streets. <br />~,is culvert will reducc ftood d3m3~e ~"tential t~ the residp~p, or thp ;ntpr- <br />section. Channel improvementB on the Kennett Drainage and th.. PinE Ridge Drain- <br />age are necessary to convey all runoff to the new inlet location. <br /> <br />(15) Station 0+00 to 3+50 - A channel should be excavated leading to the <br />inlet of the culvert which should be inotalled for Improvement (9l . n..enew <br />channel alignment will be located along the sooth side of the alley to prevent <br />floodin~ of residences at the Elm I Elbert Street intersection. The following <br />channel size and properties are rec{)ftUCnded: <br /> <br />Option 1: 100-Ye"rChanuclDe.ign <br /> <br />Capacity - QlOO . 226 cfs <br />Bottom Width - 7 feet <br />Side510p...-4:1 (ifp".",ble) <br />Estimated Depth-2.3 fe..t <br /> <br />Option ~: Z)-Year Channel Design <br />with Drainage Easement <br />Capacity - Q25 . 90 cfs <br />Bottom Width - 4 feet <br />sideSlope.-4:1 <br />Estimated Depth - 2.0 reet <br /> <br />Capacity - QIOO . 115 cfa <br />Bottom Wid~h - 5 feet <br />Side Slope. - 4:1 or flllt~er <br />Estimated Depth - 1.9 feec <br /> <br />Option 2: 25-Ye.atChannellle.ign <br />with Drainsge Easement <br />CllpacitY-QZ5-75ds <br />Bottom Width - 4 feet <br />SideSlopes-4:1 <br />Estimated Depth - 1.7 feet <br /> <br />(10) Ststion 20+70 to 21+95 - A channel should be excavated with the follow- <br />ing Size and propertie.' <br /> <br />Option 1: 100-YearChannelDesign <br /> <br />-61- <br /> <br />-62- <br />