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August 2017
5-6
City of Morgan Hill
Sewer System Master Plan
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Basin 4.
This basin includes 9 percent of the total acres and 8 percent of the existing dry
weather flows.
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Basin 5.
This basin includes 8 percent of the total acres and 11 percent of the existing dry
weather flows.
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Basin 6.
This basin includes 20 percent of the total acres and 18 percent of the existing
dry weather flows.
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Basin 7.
This basin includes 4 percent of the total acres and 6 percent of the existing dry
weather flows.
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Basin 8.
This basin includes 4 percent of the total acres and 7 percent of the existing dry
weather flows.
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Basin 9.
This basin includes 12 percent of the total acres and 8 percent of the existing dry
weather flows.
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Basin 10.
This basin includes 5 percent of the total acres and 8 percent of the existing dry
weather flows.
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Harding Basin.
This basin includes 17 percent of the total acres and 12 percent of the
existing dry weather flows.
5.3 BUILDOUT WASTEWATER FLOWS
The land use methodology was used to estimate the buildout flows from the City’s Planning Area
and to be consistent with the General Plan.
Table 5.3
documents the total acreages for residential
and non-residential land use, and the undeveloped lands designated for urbanization. The
undeveloped lands were multiplied by the corresponding unit flow factor to estimate the sewer
flows. The 2014 flows were increased to 2.8 mgd to account for 100% occupancy, and the
ultimate buildout flows were calculated at 4.2 mgd.
5.4 SEWER COLLECTION SYSTEM DESIGN FLOWS
The design flows most relevant in this capacity analysis of the sewer system, in addition to the
Maximum Day Dry Weather Flows (MDDWF), include the peak dry weather flow (PDWF) and
peak wet weather flow (PWWF).
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Peak Dry Weather Flow (PDWF).
The PDWF is used for evaluating the capacity
adequacy of the sanitary sewer system, and to meet the criteria set forth in the previous
chapter and in the City standards.