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<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 />4.0 STREAMFLOV ANALYSES - BIG THOMPSON RIVER (TASK 2) <br /> <br />The Big Thompson River basin provides the natural (or "native") water <br />available to owners of direct-flow water rights on that stream. Big <br />Thompson streamflow, therefore, dictates the quantity of water available to <br />the City from its own direct-flow rights and from City ownership in <br />irrigation and ditch companies diverting from the Big Thompson River. <br /> <br />As discussed earlier in Section 2.1, the methodology employed in this study <br />included supplementing the historic record of Big Thompson streamflow <br />through use of statistical correlation techniques. These techniques are <br />illustrated in the following example: <br /> <br />4.1 EXAMPLE OF DATA AUGMENTATION PROCEDURE <br /> <br />Annual streamflow records are available for two streams in hydrologically <br /> <br /> <br />similar watersheds. The Veather Service also maintains a weather station <br /> <br /> <br />nearby which records annual rainfall. The streamflow records and rainfall <br /> <br /> <br />data are given below: <br /> <br />YEAR 1 2 3 4 5 6 7 8 9 10 11 12 <br />Rainfall (in) 15 20 15 15 20 20 5 20 <br />Stream #1 <br />(AC-FT) 200 300 300 400 300 300 400 300 200 <br />Stream #2 <br />(AC-FT) 75 100 75 75 100 <br /> <br />The record shows that the rainfall station was discontinued after 10 years <br />of operation and streamflow measurements at Stream #2 were taken only <br />during a 5-year experimental program. Stream #2, however, provides the <br /> <br />4-1 <br />