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<br />.~ <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />2.0 HETHODOLOGY <br /> <br />2.1 WATER AVAILABILITY <br /> <br />The City's raw water sources include the following: <br /> <br />1. Big Thompson River direct-flow water rights. <br /> <br />2. Ownership in a number of private irrigation ditch and reservoir <br />companies. <br /> <br />3. Ownership of Colorado-Big Thompson Project (CBT) units. <br /> <br />4. Ownership of Yindy Gap Project (WGP) units. <br /> <br />Both the CBT and Yindy Gap projects derive their supply from streams in the <br />Upper Colorado River Basin. Conveyance facilities (e.g., Adams Tunnel, <br />Dille Tunnel, Charles Hansen Feeder Canal, etc.) are operated and <br />maintained by the Northern Colorado Yater Conservancy District (NCYCD) and <br />HS-NCYCD to transport CBT and YGP water across the Continental Divide and <br />deliver that water to shareholders along the Front Range and in <br />northeastern Colorado. Figure 2-1 illustrates the various components and <br />raw water sources of the City's water supply. <br /> <br />The first step in pursuing the study objectives was to determine the <br />physical supply of water that would be available in any given month in the <br />Big Thompson River and from the CBT and Windy Gap projects. Since <br />streamflow is highly dependent upon such natural factors as rainfall, and <br />snowfall and snowmelt, this determination is based upon probabilities and <br />expected extremes rather than constant values for any given month or period <br />of months. Techniques used to define streamflow characteristics during <br />low-flow periods are referred to as "drought analyses." <br /> <br />A drought is defined as "some period of time with below-average streamflow" <br />and the severity of any given drought is commonly expressed in terms of: <br /> <br />2-1 <br />