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Floyds Fork Bacteria TMDL. Andrea M. Fredenburg Kentucky Division of Water TMDL Section November 28, 2012. Goals. Present watershed information Present TMDL calculations Provide example for one stream segment Vote on options for path forward to public notice. KY’s Bacteria Criteria.

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floyds fork bacteria tmdl

Floyds Fork Bacteria TMDL

Andrea M. Fredenburg

Kentucky Division of Water

TMDL Section

November 28, 2012

goals
Goals
  • Present watershed information
  • Present TMDL calculations
  • Provide example for one stream segment
  • Vote on options for path forward to public notice
monitoring data
Monitoring Data
  • 319 (h) funded—Currys Fork and Bullitt Co.
  • MSD
  • Historical KDOW data
  • EPA funded—USGS data collection
bacteria impaired segments
Bacteria Impaired Segments
  • 18 impaired stream segments
    • 18 E. coli PCR
    • 4 Fecal coliform PCR
    • 4 Fecal coliform SCR
  • 26 listed waterbody/pollutant combinations
potential sources
Potential Sources
  • KPDES-permitted sources to WLA
  • Others to LA
sewer lines
Sewer Lines*

*Information Not Available

for Jefferson County

sewer lines1
Sewer Lines*

*Information Not Available

for Jefferson County

tmdl calculation example
TMDL Calculation Example
  • South Fork Currys Fork 0.0 to 6.1
  • E. coli PCR impairment
  • SFCF-2 USGS sample site
tmdl equation
TMDL Equation

TMDL (allowable # per day) = Allowable Concentration (allowable # per 100 ml) x Flow (in cubic feet per second)

x Conversion Factor (24,465,758.4 per day)

Conversion factor is figured as 1 cubic foot = 28316.85 ml and

1 day = 86400 seconds

1 x 1 cubic foot x 28316.85 ml x 86400 seconds = 24,465,758.4

100 ml second 1 cubic foot 1 day 1 day

convert gage flow to tmdl site flow
Convert Gage Flow to TMDL Site Flow

Flow at sample site = Acres of land draining to sample site

÷ Acres of land draining to gage site x Flow at gage

Flow at sample site =

4672 acres ÷ 51136 acres x 233 cfs

Flow at sample site = 21.3 cfs

site sfcf 2 tmdl
Site SFCF-2 TMDL

TMDL = Allowable Concentration x Flow x Conversion Factor

TMDL = 240 E. coli colonies per 100 ml x 21.3 cfs x 24,465,758.4 per day

TMDL = 125,068,956,900 E. coli colonies per day

TMDL = 1.25E+11 E. coli colonies/day

segment tmdl
Segment TMDL

Segment TMDL = Site TMDL x Acres at downstream end of segment ÷ Acres at site

Segment TMDL = 1.25E+11 E. coli colonies/day x 5949 acres ÷ 4672 acres

Segment TMDL = 1.59E+11 E. coli colonies/day

tmdl and flow
TMDL and Flow

TMDL = Allowable Concentration x Flow x Conversion Factor

TMDL ≈ Flow

Sample Load = Sample Concentration x

Flow (on sample day) x Conversion Factor

tmdl allocations
TMDL Allocations

TMDL = ∑WLA + ∑LA + MOS

Explicit MOS is 10% of TMDL

South Fork Currys Fork 0.0-6.1

Segment TMDL = 1.59E+11 E. coli colonies/day

MOS= 1.59E+11 E. coli colonies/day x 10%

MOS= 1.59E+10 E. coli colonies/day

sws wla
SWS-WLA

SWS-WLA = Allowable Concentration of Bacteria (#/100 ml) x Facility Design Capacity (Design Flow in cfs)

x Conversion Factor (24,465,758.4/day)

South Fork Currys Fork 0.0 to 6.1

remainder
Remainder

Remainder = TMDL – MOS – ∑SWS-WLA

South Fork Currys Fork 0.0 to 6.1

Remainder = 1.59E+11 - 1.59E+10 - 1.68E+09

Remainder = 1.42E+11 E. coli (colonies/day)

ms4 wla
MS4-WLA

MS4-WLA = # Acres of Developed Land in MS4 ÷

# Acres in Subwatershed x Remainder

For South Fork Currys Fork 0.0 to 6.1

754 acres of developed land in the MS4

5948.52 acres in the subwatershed

Remainder = 1.42E+11 E. coli (colonies/day)

South Fork Currys Fork 0.0 to 6.1

MS4-WLA = 754 ÷ 5948.52 x 1.42E+11

MS4-WLA = 1.80E+10 E. coli (colonies/day)

future growth wla
Future Growth WLA

Future Growth-WLA = Future Growth WLA Percentage x Remainder

South Fork Currys Fork 0.0 to 6.1

754 acres of developed land

5948.52 acres of land in the subwatershed.

Percent Developed Area = 12.68 (754 ÷ 5948.52 = 12.68%)

  • Future Growth WLA Percentage = 2%, Remainder = 1.42E+11

Future Growth-WLA = 2% x 1.42E+11 E. coli (colonies/day)

Future Growth-WLA = 2.83E+09 E. coli (colonies/day)

slide41
LA

∑LA = TMDL - MOS - ∑WLA

South Fork Currys Fork 0.0 to 6.1

TMDL = 1.59E+11

MOS = 1.59E+10

  • ∑ SWS-WLA = 1.68E+09
  • MS4-WLA = 1.80E+10
  • Future Growth-WLA = 2.83E + 09
  • ∑WLA =2.25E+10

∑LA= 1.59E+11 – 1.59E+10 – 2.25E+10

∑LA= 1.21E+11

the tmdls and allocations
The TMDLs and Allocations
  • E. coli PCR
  • Fecal coliform PCR
  • Fecal coliform SCR
slide46
Vote
  • TAC review/comments prior to public notice
  • TAC review/comments concurrent with public notice
contact information
Contact Information

Andrea M. Fredenburg

TMDL Section

Division of Water

200 Fair Oaks Lane

Frankfort, KY 40601

Andrea.Fredenburg@ky.gov