City of Morgan Hill Sewer System Master Plan 2017

Table ES.1 Sewer System Performance and Design Criteria Sewer System Master Plan City of Morgan Hill

PRELIMINARY

Pipeline Criteria Peak Dry Weather Flow Criteria

Diameter (in) 8 to 12 > 12

Maximum Allowable d/D

Existing Trunks

Proposed Trunks

0.90 0.90

0.75 0.75

Peak Wet Weather Flow Criteria

Hydraulic Grade Line (HGL) should be at least 3 feet below the manhole rim Pipe Minimum Size Grade (in) (ft/ft) (mgd) (cfs) 8 0.0026 0.36 0.55 10 0.0019 0.56 0.87 12 0.0015 0.79 1.23 15 0.0011 1.28 1.98 18 0.0009 1.78 2.75 21 0.0007 2.43 3.76 24 0.0006 3.27 5.05 27 0.0005 4.18 6.47 30 0.0004 5.13 7.94 33 0.0004 6.04 9.34 36 0.0004 7.61 11.78 42 0.0003 10.27 15.90 1/7/2016 Capacity (n = 0.013)