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NewFields CALCULATION COVER SHEET <br /> Client Newmont Preparer: <br /> Project VLF/OSA Closure Study Checked: <br /> Title SGOSA Channel 2 Stormwater Management lRevision A <br /> CALCULATION OBJECTIVE <br /> 1. Estimate the peak runoff from the Squaw Gulch Overburden Storage Area during closure to design the benching <br /> and stormwater diversion channels <br /> 2. Determine the required size of the south diversion channels and erosion protection <br /> ASSUMPTIONS <br /> 1. SCS curve numbers based on knight Peisold report <br /> 2. 100yr, 24hr storm event of 4.1" <br /> 3. 500yr, 24hr storm event of 6.3" <br /> METHODOLOGY <br /> 1.Area and length measurements were determined using AutoCAD Civil 3D. <br /> 2.SCS Type II Storm event was modeled. <br /> 3. HEC-HMS was used to model the storm events <br /> 4. HEC-15 was used to calculate the flow depths <br /> REFERENCES <br /> 1. AutoCAD Civil 3D version 2018. <br /> 2. United States Department of Agriculture Natural Resources Conservation Service(NRCS). (1986). "Urban <br /> Hydrology for Small Watersheds,Technical Release 55 Second Edition,"June <br /> 3. U.S. Department of Agriculture(USDA), Natural Resources Conservation Service(NRCS). "Part 630 Hydrology <br /> National Engineering Handbook." 210-vi, NEH, May 2010. <br /> 4. United Stated Department of Commerce, National Oceanic and Atmospheric Administration. (reprinted 1984). <br /> "Hydrometeorological Report No.49, Probably Maximum Precipitation Estimates,Colorado River and Great Basin <br /> Drainages,"(HRM 49) <br /> 5. United States Army Corps of Engineers. Hydrologic Modeling System (HEC-HMS)Version 3.5,Computer Program <br /> (August 2010) <br /> 6. Newmont"Cresson Project Amendment 11," December 2015 <br /> CONCLUSIONS <br /> n/a <br /> Filename <br /> P\Projects\0106 035 Closure Stormwater\H-CALCULATIONS\Perimeter Channels\[2019 04 02-SGOSA 2 Hydrology Overview xlsx]Hec Calc Cover <br />