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<br />. <br /> <br />~ <br /> <br />. <br /> <br />Statement of Work for Project No. GEWEX97-0045 <br />April 12, 2000 <br /> <br />Demonstration of Improved Operational Vi ater Resources Management <br />Through Utilization of Better Snow Water Equivalent Information <br /> <br />Principal Investigator: Stieve Hunter <br /> <br />Goal <br /> <br />The goal of this cooperative effort between the Bureau of Reclamation (Reclamation) and NOAA is to <br />demonstrate improved operational water resources management resulting from better snow water equivalent <br />(SWE) information. This goal will be pursued by helping merge NEXt generation weather RADar (NEXRAD) <br />estimates of SWE into the current National Weather Service (NWS) scheme of SWE and snow cover mapping <br />(which does not use radar), and by demonstrating that the resulting improved streamflow forecasts are <br />beneficial to Reclamation's ability to prudently manage water resources for multipurposes. <br /> <br />Reclamation will work closely with the NWS National Operational Hydrologic Remote Sensing Center <br />(NOHRSC) in Chanhassen, MN, toward improving NOHRSC-produced gridded fields ofSWE and snow cover <br />in the Snow Data Assimilation System (SNODAS). These NOHRSC products are vital for initialization of <br />various models that predict snowmelt and streamflow. Re:clamation is a major Federal water resources <br />management agency. Therefore, improved SWE and snow cover mapping, which directly lead to more accurate <br />streamflow predictions, significantly impact Reclamation's ability to effectively manage its reservoirs, <br />hydroelectric facilities, water distribution systems and associated infrastructure. <br /> <br />I. Reclamation will accomplish the following during the sE~cond and third years of effort: <br /> <br />1. Access near real-time NEXRAD radar Level III reflectivity products from the Chanhassen, MN, (KMPX), <br />to Bismarck, ND (KBIS); Aberdeen, SD (KABR); Grand Forks, ND (KMVX); Minneapolis, MN (KMPX), <br />Duluth, MN (KDLH), Minot, ND (KMBX), Rapid City, SD (KUDX), Billings, MT (KBLX), Glasgow, MT <br />(KGGW), and Great Falls, MT (KTFX). <br /> <br />2. Update hourly accumulations for all ten radars according to the approximate 4 km HRAP grid specified <br />by the National Weather Service (NWS) National Operational Hydrologic Remote Sensing Center <br />(NOHRSC), in Chanhassen, MN. <br /> <br />3. Provide a real-time ten-radar composite. This composite was extended to include five additional radars that <br />extended from Duluth, MN to Great Falls, MT WSR-88D radar through a NIDS vendor. <br /> <br />4. Update the SAA to account for range correction and virga errors. <br /> <br />5. Develop software to display the SWE estimates for the past 1 and 3 hours, and since the beginning of each <br />snow storm, and evaluate SAA accuracy. <br /> <br />6. Develop the means to provide gridded fields of radar-estimated SWE to NOHRSC in a timely fashion for <br />their SNODAS snow water equivalent analysis. <br /> <br />1 <br />