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6 <br />• <br />C <br /> <br />NOTES: ' <br />i <br />1. Plant drainage system designed for 25-yr flood using Rational Method. Storm <br />intensities from City of Pueblo drainage cxiteria. <br />2. Storm sewer sizes based on concaete pipe (n=0.013) at a nominal EGL slope of <br />1.5%. I <br />3. All streets are paved with 6" vertical curblgutter and crowned at 2% cross slope. <br />Allowable street; capacities include safety reduction factor. <br />4. Inlets ate CDOTj Type R curb opening inlets. Approximately 210 if of inlets <br />required to cap a design flood. <br />5. Runoff from off~ite of the Plant area limited by diversion ditches shown. <br />6. Storm sewer is discharged to Arroyo "E" Sediment and Detention Pond for <br />retention and treatment of runoff before discharge. Provide preformed rock lined <br />scour basin at outlet of storm sewer. <br />7. Storm sewer includes in-line oillwater separator before dischazge to <br />sediment/detentilPnpnnd: <br />8. Design runoff pdaks are provided below: <br />Design Discharge Accum. <br />Point (cfs) Area <br />(ac) <br />1 26.1 11.1 <br />2 74.2 25.2 <br />3 101 39.2 <br />4 127 47.1 <br />5 186 65.9 <br />6 26.3 7.2 <br />7 46.2 5.0 <br />8 212 78.7 <br />P:~ Sub-basin area <br />11.1 0.5 <br />Area (acres) RunoB coetflclent <br />Design <br />GCC Rio Grande <br />Red Rock Plant and Mine <br />Plant Area <br />ce Water Management Plan <br />June 26, 2002 <br />.~ _~ <br />