City of Morgan Hill Sewer System Master Plan 2017

Table 5.1 Historical Flow Data and Peaking Factors Sewer System Master Plan City of Morgan Hill

PRELIMINARY Seasonal Average Maximum Month Maximum Day Total SCRWA Plant Flow 1

Average Annual Flow

Year

Population

Per Capita Flow

Percentage Change

ADWF AWWF MMDWF MMWWF

MDDWF MDWWF

MDDWF

MDWWF

AAF

(MGD)

(GPCD)

(MGD)

(MGD)

(MGD)

(MGD)

(MGD)

(MGD)

(MGD)

(MGD)

2010

40,246

2.85

71

-

2.69

3.02

2.89

3.22

3.14

4.61

7.19

8.99

2011

38,309

2.85

74

0% 2.66

3.04

2.86

3.71

3.10

5.81

7.37

11.98

2012

39,127

2.69

69

-6% 2.60

2.78

2.66

2.97

2.77

4.61

7.13

9.68

2013

40,079

2.69

67

0% 2.66

2.73

2.70

2.77

2.90

3.09

7.18

7.67

2014

41,197

2.58

63

-4% 2.52

2.64

2.64

2.73

2.81

3.69

6.57

8.45

2015

42,382

2.37

56

-8% 2.31

2.40

2.35

2.64

2.42

3.77

6.02

8.24

Historical Peaking Factors (Applied to ADWF)

2010

-

1.06

-

-

1.00

1.12

1.07

1.20

1.17

1.71

-

-

2011

-

1.07

-

-

1.00

1.14

1.08

1.39

1.17

2.18

-

-

2012

-

1.03

-

-

1.00

1.07

1.02

1.14

1.07

1.77

-

-

1.02

1.04

1.09

1.16

-

-

2013

-

1.01

-

-

1.00

1.03

2014

-

1.02

-

-

1.00

1.05

1.05

1.08

1.12

1.46

-

-

2015

-

1.03

-

-

1.00

1.04

1.02

1.15

1.05

1.64

-

-

6/29/2016

Notes:

1. Total SCRWA Plant Flow Represents combined flow of cities of Morgan Hill and Gilroy. 2. Definitions are as follows: AAF - Average Annual Flow (annual flow, expressed in daily or other time units)

ADWF - Average Dry Weather Flow (average flow that occurs on a daily basis during the dry weather season) AWWF - Average Wet Weather Flow (average flow that occurs on a daily basis during the wet weather season) MMDWF - Maximum Month Dry Weather Flow (maximum month flow during the dry weather season) MMWWF - Maximum Month Wet Weather Flow (maximum month flow during the wet weather season) MDDWF - Maximum Day Dry Weather Flow (highest measured daily flow that occurs during a dry weather season) MDWWF - Maximum Day Wet Weather Flow (highest measured daily flow that occurs during a wet weather season) PDWF - Peak Dry Weather Flow (highest measured hourly flow that occurs during a dry weather flow) PWWF - Peak Hour Wet Weather Flow (highest measured hourly flow that occurs during wet weather) 3. Source: 2010 and 2011 flows from South County Regional WasteWater Authority Community Development Report 2012, 2013, 2014, and 2015 flows from South County Regional WasteWater Authority Public Works Report