Upper Walnut/El Dorado Lake WRAPS 9 Element Plan Overview
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Upper Walnut/El Dorado Lake WRAPS 9 Element Plan Overview The overall goal of the Upper Walnut/El Dorado Lake WRAPS 9 Element Plan is to provide a blueprint of protection and restoration strategies and activities to protect and restore surface waters in the El Dorado Lake WRAPS Project Area. TMDLs within Upper Walnut/El Dorado Lake WRAPS Project Area TMDL Pollutant Priority Siltation High Eutrophication High The primary pollutant concern of this watershed’s lake is siltation and eutrophication which impacts aquatic life support, drinking water and recreation. Note Butler County Conservation District (BCCD) and Butler County Community College (BCCC) have been monitoring Duerschen and Cole Creek plus Walnut River watersheds since 1995. Bacteria, nutrients and sediment are the focus in streams. Other Assessments and Service Providers: • Ecosystem Restoration & Protection Feasibility Assessment- US Army Corps of Engineers o SWAT Model o Assessment of water quality, quantity aquatic Life support impacts from sedimentation o Dredging/reservoir management for sediment • Stream bank & riparian assessment-Wildhorse River Works • KS River Friendly Farmer Assessment- KS Rural Center Prioritization:1st- Sub-basins 40, 35, 50, 44, 23,18,14 51, 43, 24… 2nd- 48, 22, 29, 25…; 3rd- 36, 47, 28, 30, 9… Best Management Practices and Load Reduction Goals Best Management Practices (BMPs) to address bacteria, nutrients, and sediment in the watershed were chosen by the SLT based on local acceptance/adoption rate and amount of load reduction gained per dollar spent. Bacteria /Phosphorus Reducing BMPs for the El Dorado Lake Watershed: - Vegetative filter strip - Relocate feeding pens - Alternative (Off-Stream) watering system - Relocate pasture feeding site - Grazing management plan -Strategically fence ponds or stream sites Sediment Reducing BMPs -No-till farming -Terraces -Grassed Waterways -Buffers and field borders -Permanent Vegetation -Grade stabilization structures -Stream bank stabilization/weirs/planting *Fecal coliform bacteria has been identified by the Butler Community College /Butler County Conservation District Water Monitoring Program as a pollutant in the tributaries above El Dorado Lake. Although no TMDL or pollutant reduction has been established for fecal coliform bacteria specifically, best management practices used for eutrophication will also reduce fecal coliform bacteria counts. Current Targeted HUC 12 Watersheds: Durechen Creek Walnut River/School Branch Cole Creek/Gilmore Branch The current estimated sediment load from nonpoint sources in the El Dorado Lake is 315,767 tons per year according to the Watershed Planning Section (TMDL) of KDHE. The total annual load reduction allocated to El Dorado Lake needed to meet the sediment TMDL is 95,767 tons of sediment. This is the amount of sediment that needs to be removed from the watershed and is the target of the BMP installations that will be placed in the watershed. These BMPs have been determined as feasible and approved by the SLT. 95,767 tons /yr 315,767 tons/yr sediment needing to be load into El Dorado Lake 220,000 tons annual load reduced annually Watershed (100%) capacity (34%) requrired to meet TMDL The current estimated sediment load from nonpoint sources in the El Dorado Lake is 82,668 pounds per year according to the Watershed Planning Section (TMDL) of KDHE. The total annual load reduction allocated to El Dorado Lake needed to meet the sediment TMDL is 60,994 lbs/yr of phosphorus. This is the amount of sediment that needs to be removed from the watershed and is the target of the BMP installations that will be placed in the watershed. These BMPs have been determined as feasible and approved by the SLT. 60, 994 lbs /yr needing 82,688 bs/yr of phosphorus 24,099 tons annual load to be reduced annually load into El Dorado Lake (100%) allowed under TMDL (34%) requrired to meet TMDL Upper Walnut/El Dorado Lake Nine Element Plan Watershed Restoration and Protection Strategy (WRAPS) August 2012 1 Table of Contents Page Number Introduction ………………………………………………………………………………………………………………… 5 Statement of Goals……………………………………………………………………………………………………… 5 A. Watershed Map/Stream Network and HUC 12 Boundaries………………………………… 6 B. General Description of Plan Area……………………………….………………………………………… 9 Demographics …………………………………………….…………………………………………… 9 Geology…………………………………………………………………………………………….….… 10 Soil Characteristics…………………………………………………………………….…….……… 10 El Dorado Lake Characteristics……………………………………………………….………… 10 Public Water Supply Information……………………………………………………………… 11 C. Land Use/Cover……………………………………………………………………………………………….……. 12 D. Description of Potential NPS Sources and Water Quality Impacts…………………………. 14 E. Other Relevant Assessment Information as it Pertains to Identification of Sources and Targeting (Assessment Needs)………………………………… 16 1. Kansas Water Office, El Dorado Lake Watershed Stream Bank Erosion Assessment, June 2011……………………………………… 16 2. Kansas Rural Center River Friendly Farm Environmental Assessment. 17 3. El Dorado Lake Ecosystem Restoration and Protection Feasibility Study… 18 SWAT Model……………………………………………………………………………………… 18 Filter Strips on Cropland……………………………………………………………………. 23 Assessment of water quantity, quality and aquatic life impacts of sedimentation in El Dorado Lake……………………………………………………… 24 Dredging options for managing sediment accumulation in and around El Dorado Lake…………………………………………………………………… 25 Other Sediment Reducing Practices…………………………………………….. 26 4. Innovative Green Infrastructure Project Proposal, 2009 – El Dorado Lake Identification of Stream Bank Restoration Needs in the Watershed………………………………………………………… 27 5. Americorps Riparian Buffer Inventory……………………………………………….. 37 6. State Conservation Commission TMDL Inventory on livestock, cropland, and on site waste systems…………………………………………… 37 7. Selling Water to Wichita……………………………………………………………………. 37 F. Map of Classified Streams in the Upper Walnut/El Dorado Lake Watershed……… 39 G. Table of Designated Uses for All Classified Streams and El Dorado Lake……………… 40 H. Explanation of Designated Uses and Relevance to the Plan………………………………… 43 Designated Uses – El Dorado Lake……………………………………………………………………… 43 Designated Uses – Shady Creek, Bemis/Harrison Creek, Satchel Creek, Durechen Creek, Walnut River/School Branch and Cole Creek…………………………. 43 2 I. Description of Impaired Streams and El Dorado Lake………………………..……………… 44 Impaired Waters - 303(d) Listed Waters………………………………………………….………… 44 J. Description and Map of Impaired Lake…………………………………………………………… 45 K. Identification of TMDL’s and High Priority Waters to be Directly Addressed in the Upper Walnut/El Dorado Lake Watershed (Prioritization)……………………………….. 46 L. Map of TMDL’s/HP Waters in the Upper Walnut Watershed to be Directly Addressed by the Plan……………………………………………………………………………………… 48 Sub-watersheds in the Upper Walnut El Dorado Lake Watershed……… 48 Sub Basin Map………………………………………………………………………. 49 Priority Ranking Map……………………………………………………………. 50 Eutrophication Data ……………………………………………………………. 51 Upland Sediment Load Data………………………………………………… 52 Upland Channel Sediment Source Data………………………………. 53 Fecal Coliform Bacteria (Data from Butler CC/BCCD Water Monitoring Program) 54 M. Description of NPS Pollution Sources Applicable to the Selected TMDL’s/High Priority Waters and Determination of BMP Needs Within Watersheds of Priority Waters 55 National Pollutant Discharge Elimination Systems (NPDES) and Livestock Waste Facilities………………………………………………………………..………..……. 55 Point Sources……………………………………………………………………………………. 56 Non Point Sources…………………………………………………………………..………… 56 Confined Livestock………………………………………………………………. 56 Map of Active Confined Animal Feeding Operations…………… 57 Unconfined Concentrated Animal Areas……………………………… 58 Determination of BMP Needs Within Watersheds of Priority Waters 58 Eutrophication……………………………………………………………………… 58 Sediment……………………………………………………………………………… 58 Fecal Coliform Bacteria………………………………………………………… 59 N. NPS Load Reduction Targets to Meet Water Quality Goals for Each Selected TMDL or High Priority Waters………………………………………………………………………… 59 Eutrophication - Allocation of Pollutant Reduction Responsibility…… 59 Total Phosphorus Reduction in El Dorado Lake………………………………… 60 Sedimentation - Allocation of Pollutant Reduction Responsibility…… 60 Total Sediment Reduction in El Dorado Lake…………………………………… 61 Fecal Coliform Bacteria - Allocation of Pollutant Reduction Responsibility 62 O. Identification and Justification of Priority HUC 12 Sub-watersheds (w/map) for BMP Implementation to Address Each Selected TMDL/High Priority Water 62 P. Determination and Description of BMP’s to be Implemented Within Watersheds of Priority Waters………………………………………………………………………… 65 Q. Estimate of BMP Needs for the Priority HUC 12s Identified for Each TMDL/HP Water Addressed in the Plan (description of how estimates derived)…………… 68 R. Annual BMP Implementation Schedule for Each TMDL/HP Water Selected with Short, Mid and Long Term Milestones Including Associated Load 3 Reductions to Meet the Load Reduction Targets Established. ………………….…… 70 Total Phosphorus Reduction…………………………………………………………...… 88 Total Sediment Reduction………………………………………………………………… 89 S. Description and Table of Estimated annual Financial and Technical Assistance Costs for BMP Implementation Including Anticipated Sources of Assistance… 90 Additional Assessment Work Kansas Water Office, El Dorado Lake Watershed Streambank Erosion Assessment…………………………… 90 Stream Bank Erosion…………………………………………………………… 90 Sediment survey of El Dorado Lake……………………………………… 91 Sediment Source