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, Natural Environment Studies . The Colorado Division of Wildlife (CDOW) and Bureau of Land Management (BLM) have conducted field surveys of the fishery resources on these streams and found a natural envirolUnent which can be preserved on each of these streams. To quantify the resources and to evaluate instream flow requirements, the BLM and CWCB staff collected biologic and hydraulic data, and the CWCB staff reviewed and analyzed this data. Based on the results of these reviews/analyses, the CWCB staff prepared recommendations for the amount of water necessary to preserve the natural environment to a reasonable degree for each of the streams on the attached list of Instream Flow Recommendations. Water Availabilitv Studies The CWCB staff has conducted an evaluation of water availability for these streams. To determine the amount of water physically available for the Board's appropriations, the staff analyzed available USGS gage records, available streamflow models, and/or utilized appropriate standard methods to develop a hydrograph of mean or median monthly flows for each recommendation. The staff also relied upon the flow measurements made as part of the field survey as an indicator of the amount of water physically available in each stream and analyzed the water rights tabulation for each stream and consulted with the Division Engineer's Office to identify any potential water availability problems. Based upon its analysis, the staff has determined that water is available for appropriation on each stream to preserve the natural environment to a reasonable degree without limiting or foreclosing the exercise of valid existing . rights. RELEVANT INSTREAM FLOW RULES For each stream listed in the attached List of ISF Recommendations, the staff recommends that the Board proceed as provided in Instream Flow Rules 5.23, 5.30 and 5.40: 5.23 Date of Appropriation. The Board may select an appropriation date that may be no earlier than the date the Board declares its intent to appropriate. The Board may declare its intent to appropriate when it concludes that it has received sufficient information that reasonably supports the findings required in Rule 5.40. 5.30 Final Board Action on an ISF Recommendation. The Board may take final action on any uncontested Staff Recommendation(s) at the May Board meeting or any Board meeting thereafter. lfa Notice to Contest has been filed, the Board shall proceed under Rule 5.50. Flood Control and Floodplain Management -Larry Lang, Chief. Water Project Planning and Construction- Mike Serler, Chief. Instream Flows and Water Rights Investigations-Dan Merriman, Chief. Interstate Streams Investigations-Randy Seaholm, ~hi~f. Office of Conservation Planning- William Stanton, Chief. Personnel and Budget .Susan Maul, Chief .