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2015-132
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Last modified
4/20/2018 11:32:17 AM
Creation date
7/28/2015 2:00:10 PM
Metadata
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Template:
Official Documents
Official Document Type
First Amendment
Approved Date
07/07/2015
Control Number
2015-132
Agenda Item Number
12.G.1.
Entity Name
CDM Smith Inc.
Subject
Surface Water Reservoir Analysis Phase 1
Amendment No.1 Work Order No.11
Continuing Contract
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discuss limitations, if any, with reducing long-term flows downstream to the Sebastian River. <br />TASK 3 - HYDROLOGIC/HYDRAULIC (H/H) EVALUATIONS <br />Subtask 3.1 - H/H Modeling Approach <br />The CONSULTANT will use the data obtained in Task 1 and review of existing H/H models developed by <br />others (previously provided to the CONSULTANT by SRID) to develop a modeling approach to estimate <br />long-term flows and available water supply volumes within the SRID lateral canals. The approach will <br />identify specific tools, existing models and available data to be used. This is expected to be use of the <br />Hydrologic Simulation Program — FORTRAN (HSPF) for hydrology (developed by the SJRWMD) coupled <br />with the hydraulics layer of the US EPA Stormwater Management Model (SWMM) using hydraulic data <br />from the Indian River County ICPR model (originally developed by CAI). This anticipated approach is also <br />consistent with similar with other H/H evaluations performed by the SJRWMD. As part of this task, the <br />CONSULTANT will also meet with a SRID representative to discuss and confirm the operation of the <br />existing control structures. The CONSULTANT will summarize this approach in a draft technical <br />memorandum to be submitted to the OWNER and SJRWMD for review and comment. The CONSULTANT <br />will address review comments on the modeling approach and submit a final technical memorandum to <br />the OWNER and SJRWMD prior to initiating the H/H modeling. <br />Subtask 3.2 - Long Term Continuous Simulation Model <br />Using the approach documented in Subtask 3.1, the CONSULTANT will develop the H/H model using <br />HSPF and SWMM as the anticipated modeling software. The CONSULTANT will use information from <br />H/H models developed by others to develop the long-term continuous simulation model(s). The <br />CONSULTANT will convert the hydraulic information from the ICPR data so that it is compatible with the <br />SWMM data input platform. The CONSULTANT will simulate existing stages and flows within the SRID <br />lateral canals (Laterals L and C) for a time period of up to twenty years (long term continuous <br />simulation) to define hydrologic performance under typical conditions within the SRID under existing <br />conditions over a representative period, as recommended by the CONSULTANT. The simulation will also <br />include the Bypass Canal, which connects to the Lateral L, as well as Lateral D located along the western <br />edge of the SRID (the latter of which currently is not interconnected with the other SRID laterals). <br />Subtask 3.3 - Model Validation <br />The CONSULTANT will use the measurements (velocities, stages) and flow calculations from Subtask 1.1 <br />to compare the results of the H/H simulation in Subtask 3.2 to these measured values for validation <br />purposes. Based on the results of the comparison, the CONSULTANT will make adjustments, as <br />necessary, to the model parameters to achieve comparable results. <br />Subtask 3.4 — Future Land Use Evaluation <br />The CONSULTANT will apply the validated model developed under Subtask 3.2 for up to one future land <br />use scenario to determine if future growth and proposed planning in the watershed have an impact on <br />potential upstream surface water volumes. The CONSULTANT will coordinate with the OWNER to <br />identify any planned upstream alterations to the conveyance of surface waters. Using the validated <br />model from Subtask 3.2, the CONSULTANT will modify the hydrologic/hydraulic input to reflect future <br />conditions (i.e., land use, planned alterations to routing of surface waters). As the exact level of detail <br />may not be available, CONSULTANT will use the best available information to modify the hydraulic <br />representation in the H/H model based on the planned alterations. Hydrologic modifications to the <br />model will also be made based on an agreed upon planning horizon with the OWNER. Using the H/H <br />model results, the CONSULTANT will estimate the quantity of water available in the surface water <br />Smith A-3 <br />jj1646_Exhihit A.docx <br />
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