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Last modified
8/16/2009 3:02:10 PM
Creation date
10/4/2006 6:56:05 AM
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Board Meetings
Board Meeting Date
11/23/1998
Description
ISF Section - Informational Items - Staff's Report on "Evaluation of the Standards and Methods Used for Quantifying Instream Flows in Colorado"
Board Meetings - Doc Type
Memo
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<br />. <br /> <br />. <br /> <br />. <br /> <br />species other than trout (i.e., wannwater, coolwater, and endangered species). It may also be most <br />useful for developing recommendations for instream values other than fish and for developing basin- <br />wide, "No-net-Ioss" instream flow studies (e.g.. poudrelBig Thompson). However, the cost oflFIM <br />studies will most likely preclude its use on all but the most controversial of streams. <br /> <br />Respondents to the WDAFS survey identified a number of research needs regarding the <br />IFIM/PHABSIM methodology (Table I). In summary, the results of the survey indicated that future <br />research should be geared towards defining and validating the relationship between flow, habitat, <br />and fish production, developing new methods for determining instream flow requirements, and <br />developing species habitat infonnation and preference curves for local areas, threatened and <br />endangered species, and regional curves for eastern, southeastern, and southwestern species. Some <br />of these research needs are being addressed (Chelak and Jacobson 1990; Shuler and Nehring 1994). <br /> <br />Stalnaker et al. (1995) state that the goals of contemporary IFIM/PHABSIM research are to <br />(I) develop and validate a dynamic fishery population model, (2) test the habitat bottleneck <br />hypothesis, (3) develop processes for evaluating water management strategies to achieve fish <br />population objectives, (4) test strategies for long-tenn population support, and (5) improve IFIM to <br />provide a working set of analytical tools for fish population analysis. They go on to say that as <br />ecosystem planning and management approaches become more popular, IFIM techniques will have <br />to be modified to provide solutions on a broader spatial and temporal scale. <br /> <br />Due to budgetary and time constraints, it is unlikely that the CWCB or CDOW staffs will <br />be able to address any of the issues raised in the WDAFS survey directly. However, the staffs <br />should continue to monitor advancements in this area through the review of scientific publications <br />and attendance at continuing education opportunities. <br /> <br />Tennant and other non-field methods <br />Non-field rnethods, like TennaiJ.t, are popular instream flow quantification rnethods in several <br />western states. They are advantageous because they result in uniform "first-cut" flow <br />recommendations and they can be used to rapidly expand instream flow coverage over a large <br />number of streams with a minimum expenditure of time and money. <br /> <br />In Colorado, instream flow appropriations are frequently subjected to a great deal of scrutiny <br />by both the water developrnent and environmental communities. The CWCB may find it difficult <br />to make its requisite g37-92-102(3) determinations and to defend legal challenges to its instream <br />flow appropriations if the biological instream flow recommendations were based solely on non-field <br />methodologies. <br /> <br />Consequently, the use of non-field methods as the sole basis for developing instream flow <br />recommendations is not recommended. Rather, non-field methods should be used to verify instream <br />flow recommendations that are based on site-specific field data. <br /> <br />14 <br />
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