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Unifying watershed management graber & moore
1. Unifying watershed management
through an Off-site BMP
Implementation Program in the
Little Arkansas River Watershed
Ron Graber & Trisha Moore (KSU)
KDHE, SWAB
City of Wichita
SWCS
July 25, 2016
2. Current Onsite BMP Program
⢠City MS4 permit with KDHE for Total Suspended Solids
(TSS)
⢠Development and redevelopment required to meet water
quality treatment (> 1 acre)
⢠Substantial onsite expense involved
⢠What if the SWAB could find a cheaper method?
5. Offsite program: Little Arkansas Watershed
Agricultural watershed
â˘913,430 acres
â˘78% cropland
â˘19% grazingland
â˘237 registered CAFOâs
TMDLs set for the watershed
â˘52% of stream segments required
TMDLs
â˘Water quality concerns include bacteria,
nutrients, sediments, pesticides
Drinking water source for city of
Wichita and numerous smaller cities
and towns
â˘205 public water supplies
â˘7400 groundwater wells
6. Targeted Areas for Sediment
Load Reduction Needed â
6,571 tons/yr
(40 years)
Priority 1 Priority 2
7. Cost effectiveness: âRuralâ BMPs
Little Ark Watershed Cropland BMP Effectiveness
Best Management
Practice
Cost Per
Treated
Acre
Erosion
Reduction
Efficiency
Total
Reduction*
Over lifetime $/Ton
No-Till $40 75% 14.0 $2.87
Conservation Tillage $20 38% 7.0 $2.87
Grassed Waterways $160 40% 18.6 $8.60
Vegetative Buffers $67 50% 9.3 $7.17
Nutrient Management $57 25% 11.6 $4.88
Terraces $102 30% 5.6 $18.28
Intensive Crop Rotations $20 25% 4.7 $4.30
Cover Crops $60 25% 1.4 $43.01
Water Retention Structures $125 50% 9.3 $13.44
Permanent Vegetation $500 95% 17.7 $28.30
Streambank stabilization $91/ft 85% 60 $2.30
*Assumes an erosion rate of 1.86 tons/acre/year, with the
exception of streambank stabilization (2.8 tons/ft/yr)
8. Cost effectiveness: âUrbanâ BMPs
Urban BMP Lifecycle Costs/ton sediment removed
Best Management
Practice
Cost Per
Acre treated
Erosion
Reduction
Efficiency
Sediment
Reduction*
Over lifetime (tons)
$/Ton
sediment
removed
Hydrodynamic
separator $28,750 50% 5.3 $5,425
Pervious pavement $179,840 88% 9.4 $19,130
Extended detention
basin $18,465 80% 8.7 $2,120
Bioretention $35,500 75% 8 $4,440
Vegetative Buffers $4,500 90% 9.5 $475
Grass filter strip $9,600 95% 10.3 $930
*Assumes an Erosion Rate of 0.43 tons/acre/year for Medium
Density Residential or Parking Lot
25-year lifetime assumed for all urban BMPs
14. MS4 NPDES Permit Requirements
⢠July 2014: MS4 permit issued for the City of Wichita now
requires the City to manage post-construction stormwater
runoff quality
⢠Permitted Post-construction stormwater management options
include:
â On-site stormwater quality BMPs (traditional approach)
â Off-site stormwater program
⢠KDHE continues to emphasize the MS4 Permittee should
develop a Stormwater Management Program which works for
their location and circumstances
MS4: Municipal Separated Storm Sewer System
NPDES: NonâPoint Discharge Elimination System
BMP: Best Management PracticeÂ
17. Storm Water Advisory Board
formed November 2010
⢠Greg Allison, PE (Appointed by: City Manager)
⢠Richard Basore - Ex-Officio KDHE Member
⢠Chris Bohm, PE (Appointed by: Wichita Area Builders Assoc.)
⢠Don Kirkland (Appointed by: Wichita Chapter KS Society of
Professional Engineers)
⢠Hoyt Hillman (Appointed by: Sierra Club/WRAPS)
⢠David Leyh (Appointed by: Wichita Area Assoc. of Realtors)
⢠Mitch Mitchell (Appointed by: Sedgwick County Stormwater
Advisory Board)
⢠Gary Oborny (Appointed by: Kansas CCIM)
⢠Joe Pajor, (Appointed by: City of Wichita Public Works & Utilities)
⢠Jim Weber, PE (Appointed by: Sedgwick County Public Works)