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<br />.:;:.. <br />o <br />CJl <br />(Jl <br /> <br />States," U. S. Geological Survey \\Tater-Supply Paper, Part 9, <br />Colorado RiVer Basin. After 1967, these data were obtained <br />from "\\Tater Resources Data for Nevada" or "Water Resources <br />Data for Arizona" of the U.S. Geological Survey \\Tater-Data <br />annual reports. <br />Net advective energy was computed for Lake Mead from <br />monthly data collected during October, 1977 - September, <br />1978, using Equation 1. <br /> <br /> ~ <br />whorG ~ - <br /> q. <br /> 1 <br /> '\, = <br /> T. = <br /> 1 <br /> <br />qi (Ti - Tr) - qo(To - Tr) <br />k. ---k <br />1 n <br /> <br />(1 ) <br /> <br />A <br /> <br />net advected energy (cal/cm2.month) <br />monthly discharge in Grand Canyon (m3/month) <br />monthly discharge from Hoover Dam (m3/month) <br />inflow temperature (OC) computed from Harbeck et <br />al. [4J eq~~tion of (TgC + 2,60C) - (.04 Tgc) <br />- 2.1 x 10 x q., where Tgc and qi are th~ <br />average monthly temperature and discharge <br />(ft3/sec) in Grand Canyon <br />To outflow temperature (OC) measured at the lower <br />intake gates 295 ft (90 m) near Hoover Dam from <br />Paulson et al. [5J <br />o <br />Tr = reference temperature of 4,4 C <br />A average monthly surface area in Lake Mead <br />(cm2) from I,ara and Sanders [8 J <br />~ unit conversion factors <br /> <br />Estimates of net advective energy for a surface dis- <br />charge at Hoover Dam were computed by Equation 1 with To = <br />monthly surface temperature (OC) near Hoover Dam from <br />Paulson et al. [5J. <br />Differences in evaporation rates from Lake Mead for a <br />surface and hypolimnion discharge on Hoover Dam were com- <br />puted from Equation 2 [6J. <br /> <br /> E <br />where E <br /> Qvh <br /> Q <br /> vs <br /> L <br /> R <br /> <br />Qvh - Qvs <br />L(1 +R) <br /> <br />k -uk <br />i n <br /> <br />(2) <br /> <br />annual evaporation rate (cm/yr) <br />average net advective energy for the <br />hypolimnion discharge (cal/cm2'day) <br />average net advec}ive energy for a surface <br />discharge (cal/cm . day) <br />latent heat of vaporization (585 cal/cms) <br />average Bowen Ratio as estimated for Lake <br /> <br />4 <br />