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<br />Ch. 232 <br /> <br />Water' and Irrigation <br /> <br />1089 <br /> <br />to the recorded runoff at a comparable gauging station or gauging stations <br />by the interpolation of reasonable hydrologic, geologic, and natural vegetative <br />factors supplemented as provided in this section. Unless clearly unrelated, <br />the factors of the comparison shall include, but not be limited to, the follow- <br />ing elements or characteristics: <br /> <br />(I) The water basin contributing to the probable future flow at the place <br />where probable future runoff is to be determined, considering: <br /> <br />(A) The size; <br /> <br />(B) The altitude or altitudes; <br /> <br />(C) The various soil permeabilities; . <br /> <br />(D) The various vegetative covers; <br /> <br />(II) The known runoff as determined by reliable stream gauging stations <br />using interpolations when necessary from comparable gauging stations and <br />relating interpolations to the characteristics of the basin measured by the <br />comparable gauging stations as related to the basin of runnoff being deter- <br />mined; <br /> <br />(III) The slope or slopes of the terrain whose surface runoff contributes <br />to the surface water flows at the place at which a determination of probable <br />future surface water flows is required. <br /> <br />(b) The state engineer shall promulgate rules pursuant to section 24-4-103, <br />C.R.S., which include other factors for consideration in any area or situation <br />in which calculations based on the criteria in paragraph (a) of this subsection <br />(3) will probably be made more accurate by use of other or additional criteria. <br />Whenever conditions are such that records of past precipitation are an appro- <br />priate factor, he may designate any portion of official precipitation records <br />of agencies of the United States or of the state of Colorado which are appro- <br />priate in evaluating probable future water flows. He may approve use of fac- <br />tors referred to in this paragraph (b) with respect to particular areas onlesign <br />ofSpecific structures when requested to do so. <br /> <br />(c) NQ dam safety requirement shall be imposed to meet a potential <br />hazard of a flood whose magnitude is such that the hazard would probably <br />exist whether or not the dam failed. <br /> <br />Section 2. 37-87-102, Colorado Revised Statutes, as amended, is amended <br />BY THE ADDITION OF THE FOLLOWING NEW SUBSECTIONS to <br />read: <br /> <br />37.87.102. Definitions . natural streams and use thereof by reservoir <br />owners. (3.5) Whenever a determination of probable future surface water <br />flows, or the probability of frequency of their recurrence, at any place in <br />Colorado is required by relation to a longer period of flow than that for which <br />there is a reliable record of flow as defined in subsection (3) of this section, <br />the determination shall be made by interpolation and correlation of known <br />records. to the longer period by relating known records of water basins as <br />similar as reasonably possible to the place of determination or basin under <br />consideration, or by use of geologic determinations, or by use of other <br />methods reasonably calculated to formulate an accurate estimate of probable <br />