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<br />Pa ge 20 <br /> <br />Data from the gauge located furthest west in the Black Hills will <br />help evaluate the suitability of such upwind gauges for control <br />purposes should a future randomized experiment take place. <br /> <br />With one exception the standard 30.5 cm capacity gauge mechanisms <br />will be operated at all sites with 28.7 cm diameter orifices <br />rather than the standard 20.3 cm (8-inch) orifices. This reduces <br />their capacity to 15.25 cm , but increases their resolution to <br />0.13 mm. These gauges will use battery-powered clocks with <br />weekly rotation gears. The exception will be the Happy Jack <br />gauge where improved resolution will be achieved with a 45.4 cm <br />orifice (five times standard area) and daily rotation gears. <br /> <br />All gauges will use an antifreeze solution in the catch bucket to <br />convert the falling snow to solution, and an oil film on top of <br />the solution to retard evaporation. The gauges will be equipped <br />with Alter-II type windshields and will be located in sheltered <br />clearings in the forest to reduce wind-caused gauge catch <br />underestimates. <br /> <br />. <br /> <br />The Happy Jack precipitation gauge will be serviced after each <br />significant storm, or weekly, whichever occurs first. Most other <br />gauges will be serviced approximately weekly. The exception is <br />the site furthest east which will be serviced at 2-3 week <br />