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2019-166C
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Last modified
11/19/2019 1:13:01 PM
Creation date
11/19/2019 1:10:44 PM
Metadata
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Template:
Official Documents
Official Document Type
Work Order
Approved Date
10/08/2019
Control Number
2019-166C
Agenda Item Number
8.G.
Entity Name
Kimley-Horn and Associates, Inc.
Subject
Work Order 22
Water Distribution System Hydraulic model: Calibration, Evaluation, and Flushing Plan
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to evaluate the County's goals for providing the recommended ISO fire flow versus <br />performing improvements. Based on the County's goal, the Consultant will adjust fire <br />flow requirements for selected land use types and then recommend improvements <br />required to meet the resulting fire flows. Consultant will attend up to one (1) meeting to <br />discuss the fire flow requirements. <br />During the skeletonization of the hydraulic model, it was noted that some public fire <br />hydrants may be served by 4 -in watermains. The Consultant will develop a list of these <br />fire hydrants that may be currently served by 4 -in watermains. The Consultant will review <br />the previous version of the hydraulic model before it was skeletonized and identify these <br />hydrants where possible. <br />• Consultant will use the calibrated model to identify existing weaknesses and low- <br />pressure areas in system and to make recommendations for infrastructure <br />improvements that could address the areas of known low pressure conditions. <br />• Consultant will use the calibrated model to simulate average daily and maximum daily <br />flows in order to determine residence times at each node for these conditions. These <br />runs will be used as initial estimates of areas experiencing the longest residence times <br />within the water system and to estimate the service area limits of the two water treatment <br />facilities. Consultant will prepare two (2) exhibits within the WaterGEMS platform to <br />show the results of the residence time analysis for both the average daily flow and <br />maximum daily flow conditions. <br />• Consultant will use the calibrated model to evaluate the operation of and provide <br />recommendations for elevated storage tank operational changes or elimination, and/or <br />infrastructure improvements. A preliminary evaluation of the ground storage tanks was <br />performed by Kimley-Horn as part of a separate work order. The work included with this <br />task will be finalizing the recommendations using the calibrated model. It is assumed <br />that up to two days of effort is required for this task and significant effort beyond this <br />amount will be considered additional services. <br />• Consultant will use the calibrated model along with information provided by Hydromax <br />regarding the County's valves and input from the County to identify critical valves in the <br />distribution system. The Consultant will meet with the County to develop the list of <br />potential criteria (amount of flow, valve age/condition, accessibility, proximity to critical <br />customers, etc) that can be used to prioritize the inline valves (6 -in and larger) within the <br />distribution system. <br />• Consultant will prepare a draft report summarizing the combined water system findings <br />including a list of recommendations, and preliminary opinions of probable costs for the <br />recommended improvements. Consultant will attend one (1) meeting to discuss the <br />report findings and revise the draft report up to one (1) time to address reasonable <br />comments. Consultant will furnish up to six (6) copies of the report and all deliverables. <br />
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