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Appendix A <br />Four Corners Materials <br />Evaporation Calculation for Site near Simmons Pit, Mancos, CO <br />Surface Area of HCU Ponds 049 acres <br />Gross Evaporation 45.57 Inches' <br />Precipitation Station Mancos <br />Column Notes (1) From SEC's Guidelines (2/28/95) for sites with elevation above 6,500 ft <br />(2) Annual value from NOAA Technical Report NWS 33. <br />(3) Average annual precipitation data from NOAA recording station at Marcos <br />(4) Equals Column (3) x 0.70 <br />(5) Column (2) - Column (4) <br />(6) Column (5) / 12 <br />(7) Column (6) x surface area of HCU ponds in acres HCU ponds are on- channel <br />(8) Column (2)/12 x surface area of wash pit in acres. Wash pits are not on- channel <br />Footnote (a) Interpolations from CDSS evaporation contour of 45 In and 50 In <br />PM1- 00A120 -Senn WSWSP Renewal 2013 Red Do11 <br />Smmone SWSP Tables 2013 Wnght Water Engineers, Inc des RKH <br />Al - Evaporative Deplebam June 2013 ckd PRF <br />(1) <br />Monthly <br />Evaporation <br />Distribution <br />(2) <br />Gross <br />Evaporation <br />(3) <br />Average Year <br />Precipitation <br />(4) <br />Effective <br />Precipitation <br />(5) <br />Net Unit <br />Evaporation <br />Rate <br />(6) <br />Net Unit <br />Evaporation <br />Rate <br />(7) <br />Total Net <br />Evaporation <br />HCU Storage <br />Ponds <br />Month <br />(inches) <br />(inches) <br />me es <br />Inc es <br />(feet)- <br />January <br />1.0 <br />046 <br />1.44 <br />101 <br />0.00 <br />0.00 <br />0.00 <br />February <br />3.0 <br />1 37 <br />1.29 <br />090 <br />046 <br />0.04 <br />0.02 <br />March <br />60 <br />2.73 <br />1.61 <br />1 13 <br />1.61 <br />0.13 <br />0.07 <br />April <br />90 <br />4.10 <br />1.36 <br />0.95 <br />3 15 <br />026 <br />0.13 <br />May <br />125 <br />5.70 <br />1.13 <br />0.79 <br />491 <br />041 <br />020 <br />June <br />155 <br />7.06 <br />064 <br />045 <br />6.62 <br />055 <br />027 <br />July <br />16.0 <br />7.29 <br />1 76 <br />1.23 <br />6.06 <br />050 <br />025 <br />Au ust <br />130 <br />5.92 <br />1.96 <br />1.37 <br />455 <br />038 <br />019 <br />September <br />11 0 <br />5.01 <br />1 53 <br />1.07 <br />3.94 <br />033' <br />0 16 <br />October <br />75 <br />342 <br />1.61 <br />1.13 <br />229 <br />019 <br />009 <br />November <br />40 <br />1 82 <br />1.20 <br />084 <br />0.98 <br />0.08 <br />0.04 <br />December <br />1 5 <br />068 <br />1.34 <br />0.94 <br />0.00 <br />000 <br />0.00 <br />Annual <br />100 <br />1 45.57 <br />16.87 <br />11.81 <br />34.57 <br />2.88 <br />1.41 <br />Column Notes (1) From SEC's Guidelines (2/28/95) for sites with elevation above 6,500 ft <br />(2) Annual value from NOAA Technical Report NWS 33. <br />(3) Average annual precipitation data from NOAA recording station at Marcos <br />(4) Equals Column (3) x 0.70 <br />(5) Column (2) - Column (4) <br />(6) Column (5) / 12 <br />(7) Column (6) x surface area of HCU ponds in acres HCU ponds are on- channel <br />(8) Column (2)/12 x surface area of wash pit in acres. Wash pits are not on- channel <br />Footnote (a) Interpolations from CDSS evaporation contour of 45 In and 50 In <br />PM1- 00A120 -Senn WSWSP Renewal 2013 Red Do11 <br />Smmone SWSP Tables 2013 Wnght Water Engineers, Inc des RKH <br />Al - Evaporative Deplebam June 2013 ckd PRF <br />