City of Morgan Hill Sewer System Master Plan 2017
City of Morgan Hill Sanitary Sewer Flow Monitoring and Inflow/Infiltration Study
Design Storm Response Summary The 10-year, 24-hour storm event was applied to the synthetic I/I hydrograph components developed for each flow monitoring site. This method produces the best estimated response to the design storm events. These results assume full ground saturation and that the peak I/I flows from the design storm coincide with peak sanitary flows to produce a “worst-case” scenario of peak wet weather flows. Table 13 summarizes the final results for the design storm on a site-by-site basis.
Table 13. Design Storm I/I Analysis Summary
Predicted Peak Dry Weather Flow (mgd)
Predicted Peak I/I Rate (mgd)
Predicted Peak Flow (mgd)
Metering Site
Predicted Total I/I (gallons)
0.34 0.58 0.56 0.37 1.89 0.67 0.38 0.29 0.25 0.24 4.46
0.75 1.42 3.13 1.02 5.26 1.22 2.41 0.70 1.16 0.14 8.74
1.09 2.00 3.69 1.39 7.15 1.89 2.80 0.99 1.40 0.39
285,000 451,000
Site 1 Site 2 Site 3 Site 4 Site 5 Site 6 Site 7 Site 8 Site 9
1,134,000
279,000
2,128,000
468,000 749,000 214,000 371,000 52,000
Site 10 Harding
13.20
4,075,000
12-0248 AEG CofMorganHill FM Rpt.docx
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