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discuss limitations,if any,with reducing long-term flows downstream to the Sebastian River. TASK 3-HYDROLOGIC/HYDRAULIC(H/H) EVALUATIONS Subtask 3.1-H/H Modeling Approach The CONSULTANT will use the data obtained in Task 1 and review of existing H/H models developed by others(previously provided to the CONSULTANT by SRID)to develop a modeling approach to estimate long-term flows and available water supply volumes within the SRID lateral canals.The approach will identify specific tools,existing models and available data to be used.This is expected to be use of the Hydrologic Simulation Program—FORTRAN (HSPF)for hydrology(developed by the SJRWMD)coupled with the hydraulics layer of the US EPA Stormwater Management Model(SWMM)using hydraulic data from the Indian River County ICPR model(originally developed by CAI).This anticipated approach is also consistent with similar with other H/H evaluations performed by the SJRWMD.As part of this task,the CONSULTANT will also meet with a SRID representative to discuss and confirm the operation of the existing control structures.The CONSULTANT will summarize this approach in a draft technical memorandum to be submitted to the OWNER and SJRWMD for review and comment.The CONSULTANT will address review comments on the modeling approach and submit a final technical memorandum to the OWNER and SJRWMD prior to initiating the H/H modeling. Subtask 3.2-Long Term Continuous Simulation Model Using the approach documented in Subtask 3.1,the CONSULTANT will develop the H/H model using HSPF and SWMM as the anticipated modeling software. The CONSULTANT will use information from H/H models developed by others to develop the long-term continuous simulation model(s).The CONSULTANT will convert the hydraulic information from the ICPR data so that it is compatible with the SWMM data input platform.The CONSULTANT will simulate existing stages and flows within the SRID lateral canals(Laterals L and C)for a time period of up to twenty years(long term continuous simulation)to define hydrologic performance under typical conditions within the SRID under existing conditions over a representative period,as recommended by the CONSULTANT.The simulation will also include the Bypass Canal,which connects to the Lateral L,as well as Lateral D located along the western edge of the SRID(the latter of which currently is not interconnected with the other SRID laterals). Subtask 3.3-Model Validation The CONSULTANT will use the measurements(velocities,stages)and flow calculations from Subtask 1.1 to compare the results of the H/H simulation in Subtask 3.2 to these measured values for validation purposes. Based on the results of the comparison,the CONSULTANT will make adjustments,as necessary,to the model parameters to achieve comparable results. Subtask 3.4—Future Land Use Evaluation The CONSULTANT will apply the validated model developed under Subtask 3.2 for up to one future land use scenario to determine if future growth and proposed planning in the watershed have an impact on potential upstream surface water volumes. The CONSULTANT will coordinate with the OWNER to identify any planned upstream alterations to the conveyance of surface waters. Using the validated model from Subtask 3.2,the CONSULTANT will modify the hydrologic/hydraulic input to reflect future conditions(i.e.,land use, planned alterations to routing of surface waters).As the exact level of detail may not be available,CONSULTANT will use the best available information to modify the hydraulic representation in the H/H model based on the planned alterations. Hydrologic modifications to the model will also be made based on an agreed upon planning horizon with the OWNER. Using the H/H model results,the CONSULTANT will estimate the quantity of water available in the surface water S111fgt A-3 uibab_Exnieic A.docg 121