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1053 Task 3.01 Phase n Instream Flows Objective: Modif'y Phase II model input to reflect changes in the way instream flow reaches are specified to Statemod. This subtask brings the model application into conformance with the current version of the code before the application itself is enhanced. Prerequisite: Statemod code will be modified by the State so that instream flow reach is defined by specifying the upstream and downstream termini, avoiding the current need to insert instream flow demand nodes below each structure in the reach. RTI will have modified the Statemod Gill in accordance with the Statemod program changes, User documentation will have been updated accordingly. Approach: I. Boyle: Modify input files to reflect an upstream and downstream terminus of instream flows, Specifically, change the river network file to remove "extra" instream flow nodes, edit or recreate the .dds file as necessary, and edit instream flow files to reflect new data input format. Return flow locations should be reviewed and changed if necessary to make sure that every return flow re-enters the stream at an existing node, 2, Boyle: Execute the model with the Phase II calculated scenario demand set. With the "big picture plot", compare new output with existing Phase II output for the same data set to confirm that results are not changed. 3, Boyle: Write a short (1 to 2 pages) Task Memorandum describing the changes to the input data set and the results of the scenario comparison. Deliverables: I. Updated copies of the modified Phase II input f1les will be placed on workstation cando and Boyle workstations. 2, Big picture plots comparing Phase II output with output following modification of the Phase II instream flows. 3, Task Memorandum describing changes to the input data set and the results of the scenario comparison executed in Subtask 3.01.2. Subtask 3.02 Map Preparation Objective: Prepare an electronic and hard copy map of irrigated lands, headgates, hydrology, and baseflow nodes, differentiating between that modeled in Phase II and remaining to be modeled in Phase m. This map will be a useful aid in spatial aggregation of diversion structures. Approach: I. STATE: Identif'y diversions in the Yampa River Basin which are tied to irrigated land but have no location. Define locations for these headgates. Update the CROSS ArcInfo formatted file of "Diversions" to include these structures. 2, STATE: Modif'y Statemod to allow reports providing a list of structures (wdid) modeled in a given simulation. Run this option with the Phase II Yampa River ,dds file. Phase IlIa Scope of Services A-27 June 12, 1996