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Last modified
8/11/2009 11:38:41 AM
Creation date
9/30/2006 9:57:59 PM
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Publications
Year
1992
Title
Transmountain Diversions in 1992 and Arapahoe County Transmountain Litigation of Gunnison River Water
Author
Hillhouse/Hultin/Spaanstra, P.C.
Description
Presentation addressing considerations applicable to a proposed substantial transmountin diversion project and issues about the Gunnison River litigation
Publications - Doc Type
Historical
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<br />Applicant's hydrology resulted in an excess of 35,000 acre <br />feet of water flowing out of point 116, which could not be <br />accounted for as inflow to point 120. Table 111-3 of <br />Applicant's report illustrates other discrepancies between <br />actual gauged data and the runoff predicted by the regres- <br />sion analysis. (Exhibit 438) <br /> <br />'6) In an effort to minimize these errors Applicant's <br />model independently calculates physical and legal avail- <br />ability at many of the flow points which are represented on <br />the flow network diagrams by an oval with a sub-basin <br />designation. As a result Applicant I s model does not <br />reflect the flow of water from one flow point to another, <br />but rather statistically calculates water availability at <br />the sub-basin boundaries. This methodology allows errors <br />in the prediction of physical availability above these flow <br />points 'to be used, rather than reconciled with the esti- <br />mates of physical availability at downstream flow points. <br />For example, the overestimation of physical availability at <br />and upstream of flow point 116 was not itself corrected by <br />the independent calculation wh,ich was made at the down- <br />stream point 120. <br /> <br />7) As Mr. Leak testified (on 7/3/91), an overestimate <br />of physical water availability would result in an even <br />greater overestimate of legal availability when legal <br />constraints, such as minimum stream flows, are applied to <br />the model. See Exhibit 493. V. The use of Applicant 's <br />hydrology would therefore result in an overestimate of <br />water legally available to the proposed project. <br /> <br />8) The Court finds by a preponderance of the evidence, <br />that the estimates of physical water availability by <br />Opposers' experts properly account -for the increased <br />precipitation which occurs at higher elevations within the <br />basin. Both Mr. Spronk and Mr. Helton used the gauged data <br />available at the highest elevations and performed appropri- <br />ate regression analyses in order to estimate runoff at the <br />upper gauges, such as the East River near Crested Butte, <br />for years in which no data were available. These estimates <br />are conservative, in that they may overestimate the water <br />available to the Applicant. For example, Mr. Spronk used <br />the East River near Crested Butte gauge to predict physical <br />availability on Cement Creek even though the Cement Creek <br />basin is at a lower evaluation than the Crested Butte <br />gauge. <br /> <br />B. ASSTJMP!rIONS RE ABSOLUTE AND CONDITIONAL WATER RIGHTS <br /> <br />23. The parties' experts. also varied significantly as to <br />which of the existing absolute decrees and which existing condi- <br />tional decrees they actually modelled and in the manner in which <br />they modelled the same. <br /> <br />15 <br />
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