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Sedgwick County TMDL Issues

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Biological TMDL done in 2000. Initial Wasteload Allocation ... High Priorities. Arkansas River. Little Arkansas River. Whitewater River. Lake Afton. Cheney Lake ... – PowerPoint PPT presentation

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Title: Sedgwick County TMDL Issues


1
Sedgwick County TMDL Issues
  • TAG Wichita
  • October 6, 2006

2
Current Issues
  • 1. Cowskin Creek
  • 2. Arkansas River Bacteria
  • 3. Future 303d Listings

3
Cowskin Creek
  • Western Sedgwick County Historic Dairy Country
  • Urbanizing Watershed
  • Biological TMDL done in 2000
  • Initial Wasteload Allocation for NW 3
  • Revised Wasteload Allocation for 4
  • Sediment and Channel Obstructions

4
Three Distinct Streams
  • Lowest Reaches Appear Best in Quality and
    Bio-Support
  • Middle Reaches are Sluggish and Turbid
  • Upper Reaches are Stagnant and Hyper-Eutrophic
  • Headwaters have denuded banks and are largely
    effluent dependent

5
(No Transcript)
6
Cowskin Biology
  •  
  • Historical Average Range (1990 - 2005) for
    biological data
  • Kansas Biotic Index (KBI) 3.29 (3.15-3.48)
  •  
  • Macroinvertebrate Biotic Index (MBI) 4.65 (4.18
    -5.61)
  •  
  • Ephemeroptera, Plecoptera, and Trichoptera
    (EPT) Taxa 41 (12 - 66 )
  • EPT Taxa present 10 (6-15)

7
Cowskin Chemistry
8
Potential Impact of 3
9
Average Nutrients from Area NPDES
10
TMDL Expectations of Nutrient Treatment
11
Wichita Concerns
  • 1. TN Limits too Low 8-10 mg/l
  • 2. Phosphorus Trading between 3 4
  • 3. Obstructions and Impoundments are a Principal
    Stressor Residential Dams
  • 4. Upper Watershed Land Use and Livestock
    Contributions
  • 5. Urban Stormwater

12
Lower Cowskin
13
Cowskin at 3
14
3 Effluent
15
Cowskin Above 3
16
Rural Cowskin
17
Arkansas River Bacteria
18
2006 Impaired Waters
  • 1. Arkansas River PCBs pH
  • 2. Little Arkansas River Hg Cu
  • 3. Cowskin Creek Cu, Pb, Atrazine
  • Note Atrazine in Little Ark and Ark being
    handled by 4B Watershed Plan in Little Ark

19
Current and Future Activities
  • 1. Complete Revision and Submission of Cowskin
    TMDL (with 5 others)
  • 2. Complete Little Ark 4B Plan
  • 3. Third Round TMDLs in 2011 (two listing cycles)
  • 4. Comprehensive Assessment to Delist with 2012
    list.

20
High Priorities
  • Arkansas River
  • Little Arkansas River
  • Whitewater River
  • Lake Afton
  • Cheney Lake
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