REPORT TO COUNCIL
SUBJECT
Title
Action on Amendment No. 1 to the Agreement with Woodard and Curran, Inc. for the Sanitary Sewer Hydraulic Modeling As-Needed Support [Council Pillar: Deliver and Enhance High Quality Efficient Services and Infrastructure]
Report
BACKGROUND
The City went through an RFP process and in June 2018 City Council approved an agreement with Woodard and Curran, Inc. for professional services to assist in maintaining the City's sanitary sewer system hydraulic model (sewer hydraulic model) and evaluation of sanitary sewer system capacity on an as-needed basis. For developments with higher than projected densities or flows in the 2035 General Plan, the sewer hydraulic model is used to evaluate impacts of the proposed developments on the sanitary sewer system. The sewer hydraulic model requires regular maintenance updates to ensure it contains the latest and most accurate information on the sanitary sewer system. As part of the citywide sewer condition assessment program, sewer mains are inspected and repaired or replaced annually. After construction/repair of the sewer main is completed, the sewer hydraulic model is routinely updated with more accurate pipe data reflecting the changes and then it is analyzed for conveyance capacity.
The City is also home to a number of data centers which can experience "discharge events" from their cooling systems associated with heat waves. These "discharge events" can typically take place as temperatures get into the upper 90's and 100's. Staff would like to gain a better understanding of the potential peak flow rates from these data centers during a "discharge event." In order to adequately assess the effect of such events the City should evaluate the data center locations, operations associated with discharge flows, and the weather conditions required to trigger such flows. Having this information will allow the City to update the sewer model, review the results and develop a standard procedure for ana...
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