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<br />. <br /> <br />. <br /> <br />sites in the headwaters area of the basin where river flow gag- <br />inq stations do not exist. <br />H0wever, the results from the MODSIM model runs are aggre- <br />gate values of storage and yield. of each single purpose facility <br />in a given system (alternative project). This aspect constitutes <br />a rather significant drawback especially with regards to reser- <br />voir storage. The model lacks the capability to handle break- <br />down of storage allocations since it uses aggregate storage val- <br />ues by specifying only lower and upper bounds. The aggregate <br />nature in which storages are handled at reservoir sites makes <br />simulation of the operation aspect of the system and assessment <br />of benefits from individual purposes of each facility and trade- <br />offs thereof very difficult if not prohibitively complicated for <br />integrated multifacility and multipurpose projects. <br />Therefore, the use of MODSIM will be limited to the prelim- <br />inary plan formulation phase and establishment of the allocation <br />of available water in the basin according to the dictates of water <br />rights. In the reconnaissance plan formulation activity, use <br />will be made of other operation simulation models that afford <br />better resolution and detailed representation of reservoir storage <br />allocations and operational interrelationships of units of inte- <br />grated multipurpose projects. Simulation of the operation of <br />candidate projects identified for reconnaissance evaluation will <br />be carried out using models such as the HEC-3, HEC-5 or other <br />models developed by Tudor. The selection of the particular model <br />to be used, including those developed by Tudor, will depend on' <br />the types and scales of the purposes included in the selected can- <br />didate project. <br /> <br />I-9 <br />