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constitutional standards to permit leeway to proceed rationally in light of factual studies <br />which might show that certain existing life forms would require inordinate support to <br />survive. <br />We conclude that the General Assembly has established "what job must be done" with <br />sufficient clarity. It also has answered "who must do it" since it is specifically the <br />Colorado Water Board which is authorized to appropriate waters to accomplish the <br />legislative purpose. It has sufficiently described the scope of the Colorado Water Board's <br />authority. Thus, under the standard adopted in Swisher, supra, and followed in <br />succeeding cases, Senate Bill 97 is not void for vagueness, nor an improper delegation <br />of legislative authority. <br />The Districts also complain of the Colorado Water Board's activities in accomplishing its <br />delegated duties. As mentioned, DPOR did not make an independent study, but <br />submitted that the minimum flows for fish would be adequate to preserve the remainder <br />of the natural environment. <br />The Colorado Water Board adopted the assumption that, in order to protect the <br />environment to a reasonable degree, it would be sufficient to *480 appropriate <br />minimum flows that would maintain the existing aquatic habitat and related fish <br />production. Nowhere is it shown that such an assumption was unfounded or irrational. <br />The Colorado Water Board made the assumption on the basis of an extensive report by <br />DOW and on the strength of DPOR's conclusions that the minimum flows recommended <br />by DOW were adequate for other parks and outdoor recreation purposes. <br />It is to be presumed that the Colorado Water Board carried out its duty under the <br />statute. Colorado Springs v. District Court, 184 Colo. 177, 519 P.2d 325 (1974). That <br />assumption must stand in the absence of evidence that there is no rational connection <br />between preservation of existing fish species and related fish production by minimum <br />stream flows and preservation of the natural environment. <br />We find the appellant's arguments as to the impropriety of the delegation unmeritorious. <br />IV <br />[4] Finally, the Districts contend that the Water Board has not abided by the terms <br />of its delegated authority in establishing the quantity of water necessary to "preserve <br />the natural environment to a reasonable degree." They make four allegations in support <br />of this contention: (1) that the beneficial uses contemplated are not such as would <br />support an appropriation under the constitution; (2) that the Colorado Water Board did <br />not comply with the statutory requirement that it request recommendations from DPOR <br />and DOW; (3) that the Colorado Water Board failed to show that it complied with the <br />requirement that its appropriations not "deprive the people of the State of Colorado of <br />the beneficial use of those waters available by law and interstate compact"; and (4) that <br />the Colorado Water Board acted only to preserve fish life rather than the entire natural <br />environment as the statute requires. <br />Regarding the first point, the Districts concede that the instream uses contemplated are <br />indeed beneficial. They only question whether the constitution permits appropriations for <br />beneficial uses that do not **578 entail diversions. This question has been answered <br />above in part I. <br />The parties' stipulation establishes that the Colorado Water Board did request <br />recommendations from DOW and DPOR. The fact that DPOR adopted the <br />recommendations of DOW without making an independent study does not show that the <br />Colorado Water Board did not make the requests required by Senate Bill 97. Thus, the <br />Districts' second allegation is also without merit. <br />The third allegation has been considered in part II above. <br />The final allegation also related to a matter already discussed in part III. As noted, the <br />Colorado Water Board determined that appropriation of the minimum flows necessary to <br />preserve certain fish species also would suffice to maintain the rest of the natural <br />environment. This determination was based on the Colorado Water Board's <br />considerations, including review *481 of DOW's reports and DPOR's comments. The <br /> <br />