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<br />gl-f0 17Cf(Jf.t; ( <br /> <br />"Adaptation of SNODAS for water supply decisions in the Rio Grande Basin" <br />Statement of Work for the Riverside Technology, inc. (RTi) <br />Project Sponsor - Colorado Water Conservation Board (CWCB) <br /> <br />Project Background: The Snow Data Assimilation System (SNODAS) is an experimental model recently developed <br />by the National Operational Hydrologic Remote Sensing Center (NOHRSC). SNODAS incorporates SNOTEL and <br />snow course data, satellite data, radar data and a numerical weather model to estimate snowpack spatially at a I-km <br />resolution for the entire United States. Outputs include snow depth, SWE, snowmelt at base of snowpack, and <br />sublimation. Combining all the different types of data input helps reduce errors and uncertainties related to each <br />component data set and provides spatially continuous rather than point data, ultimately providing an improved <br />assessment of snowpack. <br /> <br />Projcct Description: The CWCB, USBR, and RTi arc working together to analyze SNODAS data to see if there is <br />value added to water supply and flood forecasts. There is always a temporal gap between the April I snowpack and <br />the observed flow and index gages causes uncertainty in estimating streamflows. This pilot project will be to see if <br />there is value added from analyzing and displaying SNODAS data and data from other sources to track official water <br />supply forecasts from May I st through June 301h 2008. <br /> <br />Funding Source: <br />Funding Recipient: <br />Funding Request: <br />Total Funding: <br /> <br />CWCB Severance Tax 08 allocation <br />Riverside Technology, inc. <br />State of Colorado Purchase Order to Riverside Technology, inc. <br />$24,956 <br /> <br />Deliverablc: <br /> <br />Project Task Projcct Dcliverable Amount <br />Task I - Deliverable 1 $4.857 <br />data collection from 0 A vailable estimated natural flows from NRCS and DWR <br />NOHRSC and the Snow fee 0 Daily flows for gages in the project area with observations <br />Data Center. DWR, CWCB, during the analysis period <br />Rio Grande WCD, and NRCS 0 Forecasts from NRCS and NWS and observations of seasonal <br /> volume from WY2004-2008 for key index gages <br /> 0 Available soil moisture and snow water equivalent (SWE) data <br /> from SNOTEL stations in the project area <br /> 0 Daily snow water equivalent data grids from SNODAS in <br /> ArcGIS raster format clipped to the project area <br /> 0 PRISM monthly precipitation data. <br /> The analysis period will be October 2003 through June 2008. <br /> The project area will include the following key index gages: <br /> USGS 08220000 (Rio Grande near Del Norte CO) <br /> USGS 08220500 (Pinos Creek near Del Norte CO) <br /> USGS 08245000 (Conejos River blw Platoro Reservoir CO) <br /> USGS 08246500 (Conejos River near Mogote CO) <br /> USGS 08247500 (San Antonio River at Ortiz CO) <br /> USGS 08248000 (Los Pinos River near Ortiz CO) <br />Task 2 - analyze and display Deliverable 2a - Historical Data $10,145 <br />daily data collected \0 provide 0 Provide an Excel Spreadsheet with the historical forecasts, <br />cIata and mapping to DWR, natural flows, observed flows, SNOTEL SWE, SNOTEL soil <br />CWCB, NRCS, and Rio moisture data <br />Grande WCD 0 Monthly historical SNODAS maps for the I sl of the month for <br /> the analysis period and project area <br /> 0 Daily time series of SWE volume and percent volume <br />