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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I 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 />PART D (CHAPTER IV) <br />SUMMARY OF SUPPLY AND DEMAND <br /> <br />Dl. PRESENT SITUATION = MINIMUM FLOW YEAR <br /> <br />only the minimum reliable flow (firm yield) should be <br />considered for a municipal system. At present, the <br />firm yield available from the Gurley System on an <br />annual basis is 60 AF. However, only the amount that <br />can be presently stored separately by Norwood over <br />the winter can be effectively used in winter, since <br />the Farmers Water bylaws technically do not allow <br />winter releases. Additional water is available from <br />surface and subsurface rights (Gurley Canyon, Gardner <br />springs, etc., which are outside the Gurley system). <br />According to Table IVG, surface rights have a minimum <br />flow of about .067 cfs; minimum subsurface flow is <br />estimated to be .067 cfs. For a 182.5 day period, <br />existing water rights could contribute 49.0 AF. It <br />is important to emphasize again that the estimate of <br />flow from the Town's water rights are very approxi- <br />mate due to lack of long-term records. Table IV-J <br />summarizes present supply and demand, as discussed in <br />the previous section. <br /> <br />A supply and demand curve was prepared for the <br />Norwood system over a 12-month period of minimum <br />flow. The supply and demand curve for the present <br />Situation (Figure IV-B) shows the periods of water <br />excess and water deficit, and indicates when water is <br />available from Gurley Reservoir. For simplicity, and <br />since storage is available to balance out variations, <br />supply and demand were assumed to be constant during <br />the 6-month periods of winter and summer; in reality, <br />there would be gradual changes throughout the year. <br /> <br />As mentioned, Gurley shares have a storage component <br />and a direct flow component. The water available <br />from Gurley during the minimum flow year will come <br />entirely from the storaqe component of the Gurley <br />shares; there has been no direct flow component <br />during minimum flow years. This water can be <br />withdrawn at any time that Gurley Reservoir is <br />operating (technically May 1 to Nov. 3, when the pond <br />run is made). <br /> <br />The area between the demand curve and the water <br />rights supply curve (flow from Norwood water rights) <br /> <br />IV-26 <br />