Imperial Irrigation District 2016 Water Conservation Plan Imperial Irrigation District Water Resources Section September 2018 Imperial Irrigation District 2016 Water Conservation Plan IID’s 2016 Water Conservation Plan is intended to document calendar years 2010 – 2014. Since this document was finalized in 2018, certain operating conditions, programs and policies reflected herein may have been modified, replaced, or rescinded and revised information for years 2015 – 2019 will be reflected in the 2021 update to IID’s Water Conservation Plan. September 2018 1 Imperial Irrigation District 2016 Water Conservation Plan Table of Contents TABLE OF CONTENTS ..................................................................................................................................................................... 2 TABLES .......................................................................................................................................................................................... 5 FIGURES ........................................................................................................................................................................................ 7 DISTRICT DESCRIPTION .................................................................................................................................................................. 8 PHYSICAL SETTING, LANDS AND CROPS ................................................................................................................................................ 8 History ................................................................................................................................................................................. 8 Governance ......................................................................................................................................................................... 9 Location ............................................................................................................................................................................... 9 Size .................................................................................................................................................................................... 10 Topography ........................................................................................................................................................................ 11 Soils ................................................................................................................................................................................... 11 Natural Environment ......................................................................................................................................................... 11 Agricultural Area ........................................................................................................................................................... 12 Creosote Desert Scrub .................................................................................................................................................... 12 Riparian/Marsh Areas ................................................................................................................................................... 12 Salton Sea ..................................................................................................................................................................... 12 Sand Dunes .................................................................................................................................................................... 14 Cultural Resources ............................................................................................................................................................. 14 Climate .............................................................................................................................................................................. 15 Water Entitlement and Supply ........................................................................................................................................... 16 Groundwater ................................................................................................................................................................. 19 Water Uses and Crop Census Data ..................................................................................................................................... 24 Storage .............................................................................................................................................................................. 26 Colorado River Facilities ................................................................................................................................................ 26 Imperial Valley Facilities ................................................................................................................................................ 28 Lateral Interceptor and Discharge Return Systems ......................................................................................................... 28 Distribution Facilities ......................................................................................................................................................... 29 Water Control Center..................................................................................................................................................... 29 Conveyance System ....................................................................................................................................................... 30 Distribution System Operation ....................................................................................................................................... 35 Drainage Facilities .............................................................................................................................................................. 38 Water Measurement and Accounting Procedures .............................................................................................................. 39 Water Service, Pricing and Billing Practices ........................................................................................................................ 42 Water Cards .................................................................................................................................................................. 42 Water Rate Schedules .................................................................................................................................................... 42 Water Billing ................................................................................................................................................................. 44 Water Shortage Allocation Policies: Supply and Apportionment ........................................................................................ 44 Western Farms Land ...................................................................................................................................................... 45 IID Interim Water Supply Policy for Non-Agricultural Projects (September 2009) ........................................................... 45 IID Temporary Land Conversion Fallowing Policy (May 2012) ........................................................................................ 46 Imperial Integrated Regional Water Management Plan (October 2012) ........................................................................ 46 IID Equitable Distribution Plan (October 2013) ............................................................................................................... 48 Operation and Maintenance Program ................................................................................................................................ 48 INVENTORY OF WATER RESOURCES ............................................................................................................................................ 48 WATER BUDGET TABLES ................................................................................................................................................................ 48 2014 Provisional Monthly Water Balance ........................................................................................................................... 51 2010-2014 Provisional Annual Water Balance Results ........................................................................................................ 52 QUALITY OF WATER SOURCES ......................................................................................................................................................... 55 Surface Water Monitoring .................................................................................................................................................. 57 WATER USE ACCOUNTING .............................................................................................................................................................. 58 Agricultural ........................................................................................................................................................................ 58 Groundwater Recharge .....................................................................................................................................................