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Instream Flow Recommendation(s) I BLM's in~tream now recommendation is for 2.5 cfs (April I - May 31),1.35 cfs (June 1 to June 30) and 0.55 cfs (July 1 - ,\larch 31) (see BLM letter in Appendix A). Land Status Review TOlal Length Land Ownership Upper Terminus LO\....er Terminus (miles) %Privme % Public Headwaters East Fork Parachute Creek 1.3 0% !OO% This segment is located on HX)% public land managed by the BL\t (See attached Figure I). Biological Data The BUvl has conducted field surveys of the fishery resources on this stream and have found a natural environment that can be preserved. As reponed for this reach of slream in their Seplemher 14. 1999. lellcr to the ewes. "Fishery Surveys indicate that the slream environment is in stable condition and supports brook troUL BU"1 hclicvcs that this stream provides imponant spawning and migralOry habitat for the brook trout population residing in East Fork Parachute Creek. Food availability, spawning substrate and vegetative cover are good for salmon ids but pool habitat is a limiting factor because of the steep gradient. The paucity of pool habitat underscores the imponance of protecting sufficient water for maintaining the limited physical resource:' (see BLM Fishery Survey in Appendix B). Field Survey Data BLM and eWCB staff used the R2CROSS methodology to quantify the amount of water required to preserve the natural environment to a reasonable degree. The R2CROSS melhod requires that stream discharge and channel prolile data be collected in a rime slream habitat. type. Rimes are most easily visualized. as the stream habitat types thai would dry up first should the streamtlow cease. This type of hydraulic data collection consists of setting up a transect. surveying the stream channel geometry and measuring the stream discharge. Appendix B contains copies of the field data collected in regards 10 this proposed segment. Biological Flow Recommendations The eWCB staff rdied upon the biological expertise of the cooperating agencies to interpret the output from the R2CROSS data collected to develop the initial. biologic instream flow recommendation. This initial recommendation is designed to address the unique biologic requirements of each stream without regard to water availability" Three instream now hydraulic parameters. average depth. percent ,vetted perimeter and average velocity are used to develop biologic instream now rel.:ommendations. The eDOW has determined that by maintaining these three hydraulic parameters at adequate levels across riffle habitaHypes. 3quatic habitat in pools and runs will also he maintained for nXlst life stages of fish and aquatic invertebrates (:\'ehring 1979; Espegren 1996), For this segment of stream. one data set was collected with the results shown in Table I below. Table I sho\\"s who collected the dala (Party). the date the data was collected (Date). the measured discharge at the time of the survey (Q). the accuracy range of predicted flows based on ~lanning's Equation (2-tOq., and -to% of Q). the summer flow recommendation hased upon meeting J of 3 hydraulic criteria and the winter flow recommendation hased upon .2 of 3 hydraulic criteria.