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<br />Cross section plot from R2CROSS <br /> <br />IRON CREEK <br />CROSS SECTION DATA ANALYSIS <br /> <br />I <br />I <br />I <br />I <br />I <br />I. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />~I <br />I <br />I <br />I <br />I <br /> <br />Figure K. <br /> <br />-0,2 <br />-0.4 <br />-0.6 <br />E::' -0.8 <br />U. -1 <br />'- <br />-1,2 <br />~ -1. 4 <br />0... -1.6 <br />t.:j <br />Cl -1.8 <br />Y -2 <br />~ -2.2 <br />'-< -2.4 <br />E-< <br />a:: -2.6 <br />~ -2,8 <br />-3 <br />-3.2 <br />-3.4 <br />-3.6 <br /> <br />00193:1 <br /> <br /> <br />W <br /> <br />S <br /> <br /> <br /> <br /> <br />o 2 4 6 8 10 12 14 <br />DISTANCE FROM STAKE (FT) <br />o Channel Bottom \1 Computed Water Line <br /> <br />Biolol:ic Instream Flow Recommendations <br />When using R2CROSS, biologic <br />instream flow recommendations are based on <br />maintaining tluee principal hydraulic criteria, <br />xd ' Xv ,and %WP, at adequate levels across <br />the stream transect (Table 2), The X d and % WP <br />criteria are functions of stream top width and <br />grassline-to-grassline wetted perimeter, <br />respectively, A constant Xv of I ftIsec is <br />recommended for all streams. The DOW has <br />determined that these three parameters are good <br />indices of flow-related stream habitat quality <br />and that maintenance of these parameters at <br />adequate levels across riffle habitat-types will <br />also result in maintenance of adequate aquatic <br />habitat in pools and runs for most life stages of <br /> <br />fish and aquatic invertebrates (Nehring 1979), <br />The tluee critical hydraulic parameters <br />are estimated within the R2CROSS staging <br />table at various levels of discharge (Figure I). <br />Biologic instream flow recommendations are <br />developed by locating the modeled <br />streamflow(s) in the R2CROSS staging table <br />that satisfy the tluee hydraulic criteria <br />summarized in Table 2, The streamflow that <br />meets two of the tluee criteria is considered as <br />an initial winter flow recommendation, Initial <br />summer flow recommendations are based upon <br />satisfying all tluee criteria (Skinner. pers, <br />comm) , Aquatic biologists may modify <br />summer and winter flow recommendations <br /> <br />-18- <br />