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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The eight gauges to be installed are fully automated weighing <br />gauges (2.2 kg load cell) having 12-inch orifices mounted on 11 <br />or 18 ft standpipes with wind screens. This gauge can resolve <br />precipitation amounts down to .01 in. Using an auto siphon drain <br />and fill system and an antifreeze recharge reservoir, the gauge <br />is automatically drained when full (requiring approximately 120 <br />seconds to drain and fill) and recharged with a 20 percent <br />glycerin, 80 percent denatured alcohol nontoxic antifreeze <br />solution. The drain and fill cycle occurs when between 50 and <br />135 mm (2 to 5 in.) of precipitation has accumulated. The exact <br />amount is a function of ambient air temperature. The antifreeze <br />reservoir holds between 10 and 30 gal depending on the site. <br />Currently only three sites have the 30 gallon reservoir. The <br />additional six have 10 gallon reservoirs. The antifreeze- <br />precipitation mixture is drained periodically into a waste <br />reservoir. For those gauges with a ten gallon antifreeze <br />reservoir, at least one service trip to each of these six gauge <br />sites may be required per season to refill the antifreeze <br />reservoir. <br /> <br />The precipitation data will be collected on site by a Handar 560A <br />or 540 Data Collection Platform (DCP). Precipitation data will <br />be collected at 15 min. intervals and transmitted hourly via the <br />GOES satellite to the CDEC, GOES downlink in Sacramento and the <br />USBR Denver downlink. <br /> <br />30 <br />