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~ r,q <br />• to estimate th~ffect of the mine discharges is• d. Unfortunately, there <br />is no effective means of directly measuring the quantity of v+ater passing <br />Y ~. <br />through the waste dump and it is necessary to estimate the deep percolation <br />through the use of water balance procedures. <br />This analysis of hydrologic balance is restricted to the refuse dump <br />at the Allen btine. A map of the dump is presented in Figure 13. The <br />o-+ater balance is analyzed on an average annual basis using long term mean <br />climatic data t•rhere available. The overall hydrologic system is broken <br />down into two subsystems, the subsurface water budget and the surface water <br />budget. The two subsystems are linked by infiltration (see 14c!lhorter, 1980, <br />for basic details). <br />Climatic Summary - Precipitation, temperature, and solar radiation data <br />~ utilized in the computations are presented in Table 9. Paean temperature <br />and precipitation data based on 20 years of re ^_o rd are available at Trini- <br />dad approximately 25 miles east of the Allen t•!ine and at Plorth Lake approxi- <br />mately five miles west of the Allen t4ine. Elevations at these ti•+o sites <br />~ are 6030 feet and E°00 feet, respectively, v+hile the elevation of the refuse <br />pile is approximately 7470 feet. The means for these *.'++o locations show <br />substantial variation, probably due to elevation differences, Therefore, <br />`' the mean precipitation and temperature data presented in Table 9 v+ere ob- <br />tained by interpolating on elevation between data for Trinidad and North <br />lake. (The means for Trinidad and ^7orth Lake are presented in Aopendix F.) <br />Solar radiation data is available at only a few locations in Colorado, all <br />of which are some distance north of the mine site. For this reason the amount <br />of. solar radiation was calculated using a method presented by Jensen (1973). <br />Details and comparative data are presented in Appendix F. <br />Potential Evaporation - The amount of water lost to the atmosphere was <br />calculated by dividing the year into a winter season (llov. through 1.1ar.) <br />and a growing season (Apr. through Oct.). '.linter period losses result from <br />sublimation and evaporation and were estimated using the following equation <br />(Wymore, 1974). <br />~w = Kc (0.0067 + 0.05) Rs C <br />in which Eve represents evaporation losses `rem snow pack (inches), T <br />represents mean monthly temperature (°F) P.s is the solar radiation (ly/d) <br />