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mLoRArnO <br />??CarolFq`y^i <br />? i <br />? /I?Ir?11 <br /> '? • • ?_ <br />Statewide Water SuPPIy Initiative ° <br />NATURAL <br />1tESCrii7tCFS • ?v n •'? <br /> Attachment 2 <br />DRAFT SWSI Methodology for Estimating <br />Available Water Supply <br />Introduction <br />As part of the Statewide Water Supply Initiative (SWSI), the amount of water that <br />might be physically and legally available for development will be estimated at <br />selected points in each major water basin in Colorado. Table 1 describes various water <br />supply terms that will be used in the determination of available supply. <br />Table 1 Water Supply Terminology <br />• <br />Term D• . . D.. Sources D .. <br />Physically Available Water Quantity of water flowing in a ¦ USGS Streamflows ¦ Hydrobase <br />(Regulated) river under existing ¦ Basin Studies and ¦ StateMod <br /> o erations and administration Re orts <br />Legally Available Water Quantity of water that could ¦ SEO Diversion Data ¦ Hydrobase <br />(Unappropriated) be developed pursuant to ¦ Basin Studies and ¦ StateMod <br /> interstate compacts without Reports <br /> in'u to other water ri hts ¦ CDSS Datasets <br />Naturalized Streamflow River flows that would occur ¦ SEO Diversion Data ¦ StateMod <br /> in the absence of human ¦ SEO Reservoir Data <br /> intervention ¦ USGS Streamflows <br />USGS - United States Geological Survey <br />SEO - State Engineer's Office <br />CDSS - Colorado Decision Support System <br />StateMod - CDSS water resources planning model <br />Hydrobase - Supporting CDSS datasets <br />Physically Available Water (AF): the actual/observed amount of water flowing in the <br />stream. This regulated flow is a function of hydrology, water rights, administration, <br />and other basin operations including the effects of storage and conveyance structures. <br />Legally Available Water (AF): the estimated amount of water that could be <br />developed without injury to other water rights. The water must be first physically <br />available, and then the legal restrictions to water must be assessed (e.g., downstream <br />call, reservoir release, etc.) to estimate that portion that is unappropriated. <br />Naturalized Streamflow (AF): the total water supply that would have been available <br />absent of all human intervention (e.g., diversions, storage and releases, return flows, <br />consumptive use). Naturalized streamflow is a primary input dataset to the StateMod <br />model, referred to as "baseflow." This value should represent a theoretical ceiling on <br />available flows. <br />?? <br />S:\7ASK889SUPPLVANDDEMAND\SWSIWATERSUPPLVMETHODOLOGY 1-13-04.00C