LOWER PLATTE SOUTH NRD WATER QUALITY MANAGEMENT PLAN PREPARED MAY 2019 FOR THE LOWER PLATTE SOUTH NRD BY JEO CONSULTING GROUP, INC. District-Wide Water Quality Management Plan Lower Platte South NRD THIS PAGE LEFT INTENTIONALLY BLANK JEO Consulting Group, Inc. ii District-Wide Water Quality Management Plan Lower Platte South NRD Lower Platte South Natural Resources District District-Wide Water Quality Management Plan Prepared: March 2019 Accepted by EPA: May 2019 Acknowledgements Preparation of this watershed plan was made possible by funding assistance provided by the Nebraska Department of Environmental Quality Nonpoint Source Pollution Management (CWA Section 319) Program. JEO Consulting Group, Inc. iii District-Wide Water Quality Management Plan Lower Platte South NRD Prepared for: Lower Platte South Natural Resources District Prepared by: JEO Consulting Group, Inc. JEO Project Number: 160602.00 This watershed management plan was prepared to guide the Lower Platte South Natural Resources District in developing and implementing future projects to improve water quality, hydrology, and aquatic resources within their District. The plan may also serve as a basis for seeking financial support for those projects. It has been written with guidance published in EPA’s “Handbook for Developing Watershed Plans to Restore and Protect Our Waters,” updated March 2008, including EPA’s Nine-Elements of a Successful Watershed Plan; as well as NDEQ’s Guidance for Writing Basin Management Plans, updated November 2016. The planning process utilized a Community Based Approach. Lower Platte South NRD Contact Information: David Potter, Assistant General Manager P.O. Box 83581 3125 Portia Street Lincoln, NE 68501 402.476.2729 [email protected] JEO Contact Information: ADAM RUPE | Natural Resources Specialist JEO CONSULTING GROUP INC 2700 Fletcher Avenue | Lincoln, Nebraska 68504-1113 d: 402.474.8742 | m: 402.322.0377 | o: 402.435.3080 | f: 402.435.4110 [email protected] JEO Consulting Group, Inc. iv District-Wide Water Quality Management Plan Lower Platte South NRD TABLE OF CONTENTS Table of Contents ...................................................................................................................... v List of Appendicies ................................................................................................................. vii List of Tables .......................................................................................................................... viii List of Figures ........................................................................................................................... x List of Abbreviations and Acronyms .................................................................................... xiii Planning Participants ............................................................................................................ xvi Technical Advisory Committee .......................................................................................... xvi Citizen Advisory Committee .............................................................................................. xvi Executive Summary .............................................................................................................. xvii Chapter 1. Introduction and Background ........................................................................... 1 1.01 Plan Purpose ....................................................................................................... 1 1.02 Previous Planning Efforts ..................................................................................... 1 1.03 Planning Area ...................................................................................................... 2 1.04 Planning Process Summary ................................................................................. 6 1.05 Document Organization and Updates .................................................................. 9 Chapter 2. Goals and Objectives....................................................................................... 11 2.01 Plan Purpose ..................................................................................................... 11 Chapter 3. Watershed Characterization ............................................................................ 17 3.01 Demographic Summary ..................................................................................... 17 3.02 Physical Environment ........................................................................................ 24 3.03 Surface Water Resources .................................................................................. 42 3.04 Surface Water Hydrology ................................................................................... 52 3.05 Groundwater Resources .................................................................................... 60 3.06 Water Use and Management ............................................................................. 69 3.07 Biological Communities ...................................................................................... 73 Chapter 4. Monitoring ........................................................................................................ 79 4.01 Introduction ........................................................................................................ 79 4.02 Purpose of Monitoring ........................................................................................ 79 4.03 Data Needs and Uses ........................................................................................ 80 4.04 Current Monitoring Networks ............................................................................. 80 4.05 Other Studies and Efforts ................................................................................... 88 4.06 Data Gaps and Expanded Monitoring ................................................................ 90 4.07 Quality Assurance, Data Management, Analysis, and Assessment .................... 95 4.08 Reporting and Information Dissemination .......................................................... 95 4.09 General Support for Monitoring Activities ........................................................... 96 4.10 Monitoring Program Review ............................................................................... 96 Chapter 5. Water Quality Assessment .............................................................................. 97 5.01 Introduction ........................................................................................................ 97 5.02 Pertinent Policy and Regulations ....................................................................... 98 5.03 Overview of Existing Water Quality Data .......................................................... 101 5.04 Overview of Beneficial Uses ............................................................................ 101 5.05 High Quality and Impaired Waters ................................................................... 105 5.06 Pollutants and Sources .................................................................................... 109 5.07 Pollutant Sources ............................................................................................. 113 5.08 Water Quality Modeling .................................................................................... 121 Chapter 6. Communication and Outreach ...................................................................... 125 6.01 Introduction ...................................................................................................... 125 JEO Consulting Group, Inc. v District-Wide Water Quality Management Plan Lower Platte South NRD 6.02 Strategy Development ..................................................................................... 125 6.03 Enhancing Existing Programs .......................................................................... 129 6.04 Project Implementation .................................................................................... 131 Chapter 7. Management Practices .................................................................................. 133 7.01 Introduction ...................................................................................................... 133 7.02 Practice Classification ...................................................................................... 134 7.03 Systems Approach to Management ................................................................. 135 7.04 Common BMPs ................................................................................................ 136 7.05 Alternative & Innovative Management Practices .............................................. 139 7.06 Practice Suites ................................................................................................. 140 7.07 ACPF Tool ....................................................................................................... 141 7.08 Priority Practices .............................................................................................. 142 7.09 Existing Treatment ........................................................................................... 144 7.10 Considerations for BMP Implementation .......................................................... 145 Chapter 8. Technical and Financial Resources .............................................................. 147 8.01 Overview .........................................................................................................
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