City of Morgan Hill Sewer System Master Plan 2017

City of Morgan Hill Sewer System Master Plan

TABLE OF CONTENTS

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0.0 EXECUTIVE SUMMARY .................................................................................................ES-1 ES.1 STUDY OBJECTIVES .....................................................................................ES-1 ES.2 INTEGRATED APPROACH TO MASTER PLANNING ....................................ES-2 ES.3 STUDY AREA DESCRIPTION.........................................................................ES-2 ES.4 SYSTEM PERFORMANCE AND DESIGN CRITERIA.....................................ES-4 ES.5 EXISTING SEWER COLLECTION SYSTEM OERVIEW .................................ES-4 ES.6 SANITARY SEWER FLOWS ...........................................................................ES-4 ES.7 HYDRAULIC MODEL DEVELOPMENT AND CALIBRATION..........................ES-8 ES.8 CAPACITY EVALUATION ...............................................................................ES-11 ES.9 CAPITAL IMPROVEMENT PROGRAM...........................................................ES-11 1.0 CHAPTER 1 - INTRODUCTION ......................................................................................1-1 1.1 BACKGROUND...............................................................................................1-1 1.2 SCOPE OF WORK ..........................................................................................1-1 1.3 INTEGRATED APPROACH TO MASTER PLANNING ....................................1-3 1.4 RELEVANT REPORTS ...................................................................................1-3 1.5 REPORT ORGANIZATION..............................................................................1-4 1.6 ACKNOWLEDGEMENTS ................................................................................1-5 1.7 UNIT CONVERSIONS AND ABBREVIATIONS ...............................................1-6 1.8 GEOGRAPHIC INFORMATION SYSTEMS.....................................................1-6 2.0 CHAPTER 2 - PLANNING AREA CHARACTERISTICS .................................................2-1 2.1 STUDY AREA DESCRIPTION.........................................................................2-1 2.2 SEWER SERVICE AREAS AND LAND USE...................................................2-1 2.3 HISTORICAL AND PROJECTED POPULATION.............................................2-5 3.0 CHAPTER 3 - SYSTEM PERFORMANCE AND DESIGN CRITERIA .............................3-1 3.1 HYDRAULIC CAPACITY CRITERIA................................................................3-1 3.1.1 Gravity Sewers ..................................................................................3-1 3.1.2 Force Mains and Lift Stations ............................................................3-5 3.2 DRY WEATHER FLOW CRITERIA .................................................................3-5 3.2.1 Unit Flow Factors Methodology .........................................................3-6 3.2.2 Average Daily Wastewater Unit Flow Factors ....................................3-6 3.2.3 Peaking Factors.................................................................................3-6 3.3 WET WEATHER FLOW CRITERIA .................................................................3-9 3.3.1 Infiltration and Inflow..........................................................................3-9 3.3.2 Sewer System Flow Monitoring .........................................................3-14 3.3.3 10-Year 24-Hour Design Storm .........................................................3-14 4.0 CHAPTER 4 - EXISTING SEWER COLLECTION FACILITIES.......................................4-1 4.1 SEWER COLLECTION SYSTEM OVERVIEW ................................................4-1 4.2 SEWER COLLECTION BASINS AND TRUNKS..............................................4-1 4.2.1 Butterfield Trunk ................................................................................4-1 4.2.2 Llagas Trunk......................................................................................4-1 4.2.3 Hale-Monterey Trunk .........................................................................4-7 4.2.4 Hill-Barrett Trunk ...............................................................................4-7 4.2.5 East Dunne Trunk..............................................................................4-7 4.2.6 Railroad-Monterey Trunk ...................................................................4-7

August 2017

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City of Morgan Hill Sewer System Master Plan