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1998 Senrrn lllt%' Soulh ExDanrinn * Drainaer and S'erhmrn7 Con(rol Plan ~ 8 <br />6.0 POST MINING CHANNELS • <br />All post [Wining channels were designed to safely pass the peak discharge from the 10-year, 24-hour <br />event. The post mining channels dimensions were determined using Mannings Equation for open <br />channel flow. Al] channels will be grassed lined channels except for the steeper portions of PM-1 and <br />PM-3 which \vill require 6" riprap. All channel design inputs and results can be found in Appendix 3, <br />Post Mining Channel Designs. The design results are shown on Figure 1, Post Mining Channel <br />Designs. <br />TABLE 5 <br />SEN ECA II-\V' (SOUTH EXPANSION) <br />$EDIAIENTATION POND SUAIGL\HY <br /> Pant 015 Pond UI4 Pnnd ttl7 <br />\\'A7-EILSHED AREA (acrts): <br />Dismrbcd I 39.3 I 154.0 I 523 <br />Undisturbed I 3614 I L70.8 I 9028 <br />ToN Am 406.7 389.8 955.1 <br />POND PARAIsiE.'fERS: <br />Botmm Elevation ~ 7178.0 I 7447.0 I 13750 <br />Pnndpal Spillway Invert FJnanon I 7390.0 I 74L3.0 I 7387.0 <br />Emergcnry Spillway Invert EJcrauon I 7391.8 I 7447 U I 7}84.0 <br />Top of Embankmrnt I 7.594.0 I 7470.0 I 7388.0 <br />I <br />$tongr Volume Bdow Psindpil Spillway (ac-(t) I I <br />3.L2 I ' I <br />9.62 I <br />290 <br />$mrage Vuhune Below Emergrnq $polwar (+c h) I 4 71 I <br />I I3 62 I 4.82 <br />I <br />.Principal Spillway Paruncrers: I <br />Type I Dmp Inlet I Drop Inlet I Dmp Inln <br />Riser Diamaa (in) I I B.0 I 24.0 I 18.V <br />Riser Height (ti) I S ll I S U I 5.0 <br />Bart<I Diamcttt (in) I I B U I 24.0 I 18 U <br />Emcagericy Spillway Panmcrcrs I I I <br />Type I Tnpezoidil I Tnpezo~dal I Tnpexoidil <br />Ronom R'idth ((~) I 10A I 200 I 10.0 <br />length (R) I GU I/ I }G.0 I 30.0 <br />Side Slopes H:1 V (R) 2} 3.0 3.0 <br />HYDROLOGIC/I-fYDRAULIG PARAAIETFRS <br />10 1'eaq 24Hour Srorm Evrne <br />Prcnpitauon () I I.7 I 1 7 I I.7 <br />Runof(Volume (ac (c) I J.G$ l 11.42 I 4.02 <br />Prmdpil Spillway Peak Du<harge (c(s) I I L1 I 27.8 I 128 <br />Emngrncy Spillway P<ak Discharge (c(s) I U.U I 00 I U.0 <br />Prate Sur(uc Water Sngc EJenoon (&) I 7191 J I 7444.4 I 7385 ] <br />25-Ycu, 24-Hour Sturm Evenn I I I <br />Prcnpinuon (m) I 21 I 21 I 21 <br />Runof(Volume (u-(Q I S Blt I 14.08 I 4.52 <br />Ptindpil Spillway Pcak Dischasgc (c (s) I 00 I 0.0 I 0.0 <br />Emcrgrncy Spillway PeJ Discharge (c fs) I 28.4 I 1227 I 21.5 <br />Peak Sur(aa \Vatn Stage Elention ((~) I 739'_95 I 7468.7 I 77849 <br />fond Frtcboatd ((t) LOS 1.3 1.1 <br />SFDIhffNi LOADING PARAMETERS: <br />Storm Predated Peak Setdeable Concenmdon (ml/f) I 000 I 0.01 I 0.01 <br />Prcdicscd Mnuil Scdunrnt Loading (u-(s) I 1 21 I 5.42 I 1.57 <br />Available Scdisnent $tonge Volume (ac-ft) I 258 I 830 I 1.92 <br />Maximum Sedimrnt5mnge EJnadon (fQ I 738RU I 7441.5 I 7381A <br />Prcdictcd Number o(Stotage Years 21 7.5 1 2 <br />• <br />• <br />T1onl8Pmery IF%altan Tlinin8 Group ' 145 S. Union Bou/rvard, Suilr 960 ' InkeurooA, Co/orado 80228 * (9707 763-5790 <br />Revised OS/00 <br />