Laserfiche WebLink
<br />~\- <br />l <br />I- <br />I <br />I <br />I <br />I I <br />I I <br />I <br />I <br />] <br />I <br />l <br />I <br />I <br /> <br />The seeding solution consists (by weight) of approximately 97 percent acetone .' <br />(C3140), 2 percent silver iodide (AgI), 0.6 percent ammonium iodide (NH.I),and 0.4 <br />percent water (H20). The AgI is the active ingredient, the NJ4I allows the AgI to go <br />into solution with the acetone. These ingredients were purchased by the NCWCD. <br />NCWCD personnel mixed the solution and recharged the ground generators as needed <br />during the winter season. <br /> <br />Operation of the unit is fairly simple. The propane is turned on at the propane <br />tank by a local operator. A second valve on the propane line may be present at the CNG <br />unit, and, if so is also turned on. Once the propane flows through the CNG unit it is <br />ignited in the bum chamber (usually by using a striker). The flowmeter valve is then <br />opened and adjusted so that the required amount of solution is sprayed into the bum <br />chamber and consumed by the flame. The prescribed setting on the flow meter allows <br />the solution to bum at a rate of approximately .12 gallons an hour which in turn means <br />that the silver iodide (AgI) in solution, is burned at a rate of approximately eight (8) <br />grams an hour. The propane is consumed at a rate of one-half gallon an hour. <br /> <br />Winter storms that move into Colorado are normally accompanied by winds <br />blowing from northwesterly through southwesterly directions. The CNG's therefore are <br />located upwind of the northwest, west and southwest edges of the target in order to take <br />advantage of these winds to carry the seeding material up into the storm clouds over the <br />intended target region. Fifteen different sites are used, with locations in an arc from <br />south of the target through west and then northwest. Due to the terrain of the area, <br />distance from the target ranged from approximately 3 to 20 miles. All fifteen CNG sites <br />are located at private residences. Figure 1.1 shows the location of each of these sites. <br /> <br />3.2 Office Facilities <br /> <br />I <br />I <br />I <br /> <br />For the 1994-95 program NAWC's Salt Lake Office was equipped to receive <br />National Weather Service (NWS) information through an Alden satellite system. This <br /> <br />3-4 <br />