Roaring Fork Stream Flow Survey (2)

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4. Develop base stream flows by executing StateMod's Base flow Module. 5. Simulate the stream system's operation by executing StateMod's Simulation Module. 6. Evaluate results and generate grapb~s and tables by executing StateMod's Report Module. 7. If desired, add daily simulation capability. (ht~,c„~/icdss.state.~c~.us/ft~r/staterrnocl'.~s~p, StatelVlod Model - 9.96 (2001-08-31}documentation) Another k+~y model output is a characterization of each month of every year from 1.909-1996 as having wet, dry and average conditions. (ft ://~ c~wl~.state.co.us/rdss%roducts/statemod/a ~,go:~s/coloupT~df/co,~aappe;. ~ (page 68). Current limitation for our purposes include: 1) its inability to link point, linear, and polygon features kc;yed to a stream layer; 2) the data is reported monthly rather than daily vrhich prohibits calculation of some important hydrologic indices; 3) the current version is not current as it runs through 15-96; and 4) it has limited display capabilities. However, there are future plans to run the mode& through 2003 and report daily data. There is potential to use these gages as part of the extension process, since the datz~-centered approach and baseflow component of State,Mod make the addition of new streamflow data relatively easy (from Page 16 of (~ ://dewr:(tp.state.co.~~slcdss/~aroducts/state:~n®dJ~,~„re~~ts/col~~°~ /col,.cr.~;l~. IHA (~:t3://www.freshwate~-s.or t®cals/~ The Indic~.tors of Hydrologic Alteration (LHA) is a software package that allows h}~droiogists and ecologists to create a statistical description of a daily record of stream flow and to measure changes in this description over time. It is most commonly used with streamfiow data, but the software can be used with any type of daily hydrologic data, including river stages, ground water levels, or lake levels. The IHA was developed by scientists at The Nature Conservancy's Sustainable Waters Program and by Smythe Scientif c Software of Boulder, Colorado. The IHA software calculates a suite of more than 60 ecologically-relevant statistics from a dail~r hydrologic data series. For instance, it calculates the timing and maximum flow of each year's largest flood, then calculates the mean and variance of these values over some decades. If these statistics e~rere changed significantly by, sa`r, dam construction, you can then consider whether the change: matters to the downstream ecosystem. This method is described in the lraper "A Method for Assessing Hydrologic Alteration within Ecosystems," available on their web site The II-IAIA also includes the Range of Variability Approach (RVA) to support ecologically-based manageme-nt of hydrological systems. This method, described in "How Much Water Does A River Need?" helps with the design of adaptive management programs that use the quantified natural variation of a hydrological system as an interim management target. Using the RVA, you can propo~.e a range of variability for each :[HA parameter as a management target and quickly calculate h.ow frequently the system loss meat these goals during the data period.