Des Plaines River Watershed Plan February 1, 2017
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Des Plaines River Watershed Plan February 1, 2017 FUNDING FOR THIS PROJECT PROVIDED, IN PART, BY THE ILLINOIS ENVIRONMENTAL PROTECTION AGENCY THROUGH SECTION 319 OF THE CLEAN WATER ACT. Des Plaines River Watershed Planning Area: • 235 square miles (150,361 acres) • Flows into Sanitary and Ship Canal, the Illinois and the Mississippi Rivers Des Plaines River Watershed Gulf Hypoxia – Dead Zone Des Plaines Subwatersheds 6 Previously Approved Watershed-Based Plans • Bull Creek/Bulls Brook (2009) • Indian Creek (2009) • North Mill Creek-Dutch Gap Canal (2013) • Mill Creek (2014) • Buffalo Creek (2015) No Plan Approved • Newport Drainage Ditch • Upper Des Plaines • Lower Des Plaines • Aptakisic Creek About This Project • Create an umbrella “watershed-based plan” for the Des Plaines River Watershed • Goals to reduce nonpoint source pollution, mitigate flood damage, protect natural resources • The Des Plaines Watershed Workgroup (DRWW) is monitoring water quality Why a Watershed Plan? • Clean water, healthy lakes and streams, safety from flooding are important for residents & businesses • Existing problems: o Lake County and downstream water quality impairments o Flood damage • H2O doesn’t flow with political boundaries, planning improves coordination & cooperation among communities • Population and land use change influences • Eligibility for grant funds for plan implementation Watershed Plan Content 1. Introduction 2. Goals & Objectives 3. Watershed Characteristics Assessment 4. Watershed Problem Assessment (Consultant) 5. Flood Damage Problem Assessment 6. Prioritized Action Plan (Consultant) 7. Implementation and Evaluating Plan Performance (Consultant) 8. Education and Outreach Strategy Watershed-Based Plan 9 Elements (Consultant Deliverables) 1. Identification of the causes and sources of pollution 2. Estimate of the pollutant load reductions expected 3. Description of nonpoint source management measures & critical areas 4. Estimate of technical and financial assistance needed 5. Public information/education component (SMC) 6. Plan implementation schedule 7. Description of interim, measurable milestones 8. Criteria to determine whether pollutant loading reductions met 9. A monitoring component (Review and recommend changes to DRWW monitoring strategy as needed) RFP: Consultant Assistance Watershed Plan Components • Watershed Problems Assessment – pollutant load model, causes & sources of pollution, critical areas • Action Plan - programmatic and prioritized site- specific action plan with implementation schedule • Plan Implementation – includes pollutant load reduction calculations, technical and financial assistance needed (action plan implementation costs) • Plan Evaluation – measureable milestones, success criteria and evaluation tool, and water quality monitoring strategy Plan Review and Adoption Review/Revision Phases 1. Stormwater Management Commission 2. ~45 day public review 3. IL EPA, stakeholders including DRWW, Adoption 1. Stormwater Management Commission 2. Lake County Board 3. DRWW 4. Municipalities/Townships 5. Other stakeholder organizations Process and Timeline • Stakeholder planning group is guiding the planning process • SMC hosts 20 planning meetings 2016-early 2018 o 8 watershed-wide planning meetings (3 in 2016) o 12 topic-focused meetings (6 in 2016) Meeting materials are available on the SMC website • Draft Plan will be delivered to IL EPA February 2018 • IL EPA and Stakeholder Review March-April 2018 • Final Plan will be delivered to IL EPA by May 31, 2018 • SMC & County adoption of WBP June-July 2018 Watershed Characteristics Watershed Assessment Methods • Use Existing Studies, Reports, Information to Assess Watershed Character & Condition • Fill in Holes by Collecting New Field Data: Stream, River, Detention Basin and Lake Shoreline Inventories • Monitor Water Quality in Lakes & Streams (DRWW) • Flood Problem Area Update and Flood Questionnaire • Forecast Future Conditions • Model Nonpoint Pollution Loads • Map Green Infrastructure System Identifying Critical Areas • Highly erodible soils on agricultural land and future development sites • Severe lake shoreline erosion • Severe streambank erosion • Problem discharge points & hydraulic structures • Poor buffers along stream corridors • Highly vulnerable land use catchments • Pollutant loading hotspot catchments Planning Jurisdictions Extent: Kenosha County, WI; Lake County & Cook County, IL Portions of 38 municipalities; 18 townships Unincorporated Lake County – 30% of watershed Topography • Landscape formed by last glaciation • Watershed drains to the southeast • Topography used to delineate watersheds and used to produce planning models Water Resources • 241 miles of streams • 28,863 acres wetlands – 7,975 acres of open water – 6,824 acres of High Quality wetlands • 114 named lakes Catchments Mapped 422 catchments delineated for: • Nonpoint pollutant load modeling • Identifying Critical Areas • Action plan recommendations High Quality Natural Resources • 24 Natural Area Inventory Sites • 41 Forest Preserves/County Parks • 20 Nature Preserves • ~55 Threatened & Endangered Species Historic Landscape • Oak Woodland/Savanna • Wet Prairie • Prairie • Marsh Current Landscape • Agriculture • Residential • Open Space • Commercial/Industrial White Slough Wetland Demographics Categories 2010 2040 Population 358,451 506,232 Households 145,585 184,403 Employment 195,067 254,942 Sources: CMAP Southeastern Wisconsin Regional Planning Commission Projected Land Use Changes Sources: Lake County Southeastern Wisconsin Regional Planning Commission Chicago Metropolitan Agency for Planning Impacts of Land Use Change • Changes in land use impact watershed hydrology and alter stormwater runoff characteristics Stormwater Impacts on Streams Resulting stream channel Typical historic stream channel Channel downcutting and widening Source: Cruse et al., 2012 Stream Inventory • SMC stream inventories used to objectively assess stream “reaches” or segments • Characteristics Inventoried: – Channel Conditions – Hydraulic Structures – Discharge Points – Riparian Corridor – Aquatic Habitat • “Snapshot” assessment of overall stream condition Approximately 246 miles of inventoried streams: North Mill Creek - 2007 Mill Creek - 2013 Buffalo Creek – 2013 73 miles Bull’s Brook - 2015 Bull Creek - 2015 Indian Creek - 2015 Newport Drainage Ditch - 2015 75 miles Des Plaines River – 2016 98 miles including 38 miles of the Des Plaines River mainstem. Channel Conditions & Hydraulic Structures Channel conditions include dimensions, Measure all in-stream (hydraulic) erosion & sediment, and channelization structures such as dams, culverts, and bridges, & note any obvious issues Discharge Points, Riparian Corridor, & Aquatic Habitat Discharge points include the outlets of storm sewers, drainage ditches, and all drainage pipes and tiles >4” in diameter, note obvious Note riparian corridor and aquatic issues habitat characteristics in all reaches 26 Miles – No/Slight Channelization – 20% make labels readable 64 Miles – Low Channelization – 48% 29 Miles – Moderate Channelization – 22% 13 Miles – High Channelization – 10% 52 Miles – No/Slight Bank Erosion – 30% 107 Miles – Moderate Bank Erosion– 61% 17 Miles – Severe Bank Erosion– 10% 274 Areas Identified for Recommended Maintenance 810 Hydraulic Structures Identified 92 (11%) Identified as problems/maintenance recommended 1022 Discharge Locations Identified 181 (18%) Identified as problems/maintenance recommended Notes: COULD BE THE PIPE ITSELF, DISCHARGE OR DITCH OR SWALE 2073 Identified Debris Jams 1553 (75%) Identified as Obstructing Flow Inventory Output & Results Output: Inventory results used to: Discharge Points (pipes/tiles) = 1022 total, • Compile a general inventory 181 potential problems report for the watershed Swale/Open Channel = 421 • Create maps and tables to total, 36 problem and/or compare conditions across the maintenance required watershed Debris Jams = 2073 total, • Formulate action plan 1553 marked as obstructing recommendations for flow restoration and retrofits Hydraulic Structures = 810 total, 92 potential problems Stream Water Quality • Illinois EPA-Designated Uses in DPR Watershed: – Aquatic Life – Fish Consumption – Primary Contact (swimming) – Aesthetic Quality • Nonsupport of Use = “Impairment” Mouth of Bull Cr. (Left) at Des Plaines River, 2006 • Physical, chemical, & biological factors Impaired Segments 2016 • 14 Assessed Segments • 12 Impaired (6 on DPR) • 16 Causes • 53 Total Impairments • Mercury, Arsenic, Phosphorus, & Dissolved Oxygen most common causes High Quality & Non-Assessed Streams • Biological surveys indicate a few higher-quality reaches (Bull’s Br., Mill Cr.) • Many streams NOT assessed, and no data exist DRWW Monitoring Map 2016 Stream Monitoring Effort • 70 Sites in watershed • Physical, chemical, biological, & Little Pend Oreille Wildlife Refuge Water flow data Quality Research • Data will be used to inform action plan Lakes Lake (> 6 acres) Totals: Lakes greater than 6 acres = 88 Lakes greater than 20 acres = 55 Various Origins: Glacial Wetland-type Old gravel pits Etc… Lake Water Quality Water quality is variable (some good/bad) Insert Map 61 of the waterbodies in the watershed are impaired for at least one designated use (IL EPA). o Examples: recreational impairment (too many “weeds”), fecal coliform, turbidity, phosphorus Water Quality in Lakes Main Concerns: Turbidity (suspended solids) Phosphorus (current and historic) Dissolved oxygen Aquatic plants Invasive