Bacteria TMDLs for Brays Bayou November 11, 2008
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1 Bacteria TMDLs for Brays Bayou November 11, 2008 PARSONS
2 Outline Watershed Overview Pollutant Pollutant Source Assessment Technical Approach: Load Duration Curves TMDL TMDL Calculations
3 Brays Bayou Watershed ~170 square miles Located within 2 counties (Harris, Fort Bend) Average Annual Rainfall 47.7 inches (NOAA 2007)
4 Land Use/Land Cover
5 303 (d) Listed Assessment Units (2008) Assessment Unit 1007B_ B_ C_ E_ L_01 Water Body Brays Bayou above Tidal Brays Bayou above Tidal Keegans Bayou above Tidal Willow Waterhole Bayou above Tidal Unnamed Non-Tidal Tributary of Brays Bayou Description of Assessment Unit Not Supporting Contact Recreation Use From 11.5 km upstream of confluence with Houston Ship Channel (Brays Bayou Tidal) to SH6 From Alief Clodine Road to SH6 From Harris County line to confluence with Brays Bayou Entire Stream Entire Perennial Portion of Stream
6 Water Quality Monitoring Stations
7 E. coli Data for TCEQ Stations from 1996 to 2006 Segment Station ID Geometric Mean Concentration Number of Samples Number of Samples Exceeding Single Sample Criteria % of Samples Exceeding 1007B_ % 1007B_ % 1007C_ % 1007E_ % 1007L_ % * Geometric Mean Criteria for E. coli is 126 MPN/100mL and Single Sample Criteria is 394 MPN/100mL
8 Brays Bayou E. coli Geomeans
9 Brays Bayou E. coli Longitudinal Profile 1E+06 1E Brays Bayou E.coli (MPN/dL 1E+04 1E+03 1E+02 Geomean Standard: 126 MPN/dL 1E+01 1E km is at boundary of Segment 1007B with Segment Legend Maximum 0 River km Geometric mean Minimum
10 Outline Watershed Overview Pollutant Source Assessment Technical Approach: Load Duration Curves TMDL Calculations
11 Wastewater Treatment Plants
12 Summary of TPDES-Permitted Permitted Facilities in the Study Area Assessment Unit Number of Facilities Total Permitted Flow (MGD) Total Average Monthly Flow (MGD) 1007B_ B_ C_ E_ L_
13 Sanitary Sewer Overflows
14 Permitted Storm Water for WQ Assessment Unit Stream Name Total Area (acres) Area under MS4 Permit (Acres) Percent under MS4 Permit 1007B_01 Brays Bayou Above Tidal 42,053 42, % 1007B_02 Brays Bayou Above Tidal 4,354 4,267 98% 1007C_01 Keegans Bayou Above tidal 11,590 11,243 97% 1007E_01 Willow Waterhole Bayou Above Tidal 8,056 8, % 1007L_01 Unnamed Non-Tidal Tributary of Brays Bayou %
15 Population Projections Stream Name Assessment Unit Increase Brays Bayou Above Tidal 1007B_01 438, ,328 12% Brays Bayou Above Tidal 1007B_02 31,557 39,361 20% Keegans Bayou Above Tidal 1007C_01 85,170 97,237 12% Willow Waterhole Bayou Above Tidal 1007E_01 64,083 71,869 11% Unnamed Non-Tidal Tributary of Brays Bayou 1007L_01 12,894 13,380 4% Source: HGAC 2007
16 On-Site Sewage Facilities
17 On-Site Sewage Facilities Assessment Unit 1007B_ B_ C_ E_ L_01 Stream Name Brays Bayou Above Tidal Brays Bayou Above Tidal Keegans Bayou above tidal Willow Waterhole Bayou Above Tidal Unnamed Non-Tidal Tributary of Brays Bayou OSSF Estimate using 1990 Census method
18 Estimated Number of Pets Assessmen t Unit Stream Name Dogs Cats 1007B_01 Brays Bayou Above Tidal 120, , B_02 Brays Bayou Above Tidal 10,753 12, C_01 Keegans Bayou above tidal 24,964 28, E_01 Willow Waterhole Bayou Above Tidal 17,775 20, L_01 Unnamed Non-Tidal Tributary of Brays Bayou 7,751 8,820
19 Outline Watershed Overview Pollutant Pollutant Source Assessment Technical Approach: Load Duration Curves TMDL TMDL Calculations
20 WQM Stations Targeted for TMDL Development
21 USGS Gages in the Brays Bayou Watershed USGS Gage Number Name Period of Record Data Type Brays Bayou at South Main St. 5/25/ Present 6/8/ Present Discharge (cfs) Gage Height (ft) Brays Bayou at South Gessner Dr. 10/1/ Present 5/1/ Present Discharge (cfs) Gage Height (ft) Keegans Bayou at Roark Rd 9/1/1964-2/11/2004 8/1/ Present Discharge (cfs) Gage Height (ft) Keegans Bayou at Keegan Rd 12/10/ /28/ /10/ /28/2002 Discharge (cfs) Gage Height (ft) Brays Bayou at Alief, TX 10/1/ Present 9/27/ Present Discharge (cfs) Gage Height (ft) * Highlight - USGS gage station used to project flows.
22 Flow Percentiles Assessment Unit 1007B_ C_ E_ L_ B_02 Watershed Area (sq. mile) Average Annual Rainfall (inch) Percentile Q (cfs) Q (cfs) Q (cfs) Q (cfs) Q (cfs) 0 12,341 1,320 1,
23 LDC Schematic
24 Load Duration Curve for Brays Bayou Above Tidal (1007B_01) 1.E+07 Escherichia coli Daily Load (10 9 /day) 1.E+06 1.E+05 1.E+04 1.E+03 1.E+02 Load at Single Sample WQ Criterion Load at Single Sample WQ Target EC Observations Existing Geomean Load WWTP Wasteload Allocation Wet Weather Influenced EC Observations 1.E+01 1.E Flow Exceedance Percentile
25 Load Duration Curve for Keegans Bayou Above Tidal (1007C_01) 1.E+05 1.E+04 Escherichia coli Daily Load (10 9 /day) 1.E+03 1.E+02 1.E+01 1.E+00 Load at Single Sample WQ Criterion Load at Single Sample WQ Target EC Observations Existing Geomean Load WWTP Wasteload Allocation Wet Weather Influenced EC Observations Flow Exceedance Percentile
26 Load Duration Curve for Willow Waterhole (1007E_01) 1.E+05 1.E+04 Escherichia coli Daily Load (10 9 /day) 1.E+03 1.E+02 1.E+01 1.E+00 1.E-01 Load at WQ Criterion Load at WQ Target EC Observations Existing Geomean Load WWTP Wasteload Allocation Wet Weather Influenced EC Observations Flow Exceedance Percentile
27 Load Duration Curve for Unnamed Non-Tidal Tributary of Brays Bayou (1007L_01) 1.E+04 1.E+03 Escherichia coli Daily Load (10 9 /day) 1.E+02 1.E+01 1.E+00 1.E-01 1.E-02 Load at WQ Criterion Load at WQ Target EC Observations Existing Geomean Load Wet Weather Influenced EC Observations Flow Exceedance Percentile
28 Load Duration Curve for Brays Bayou Above Tidal (1007B_02) 1.E+05 1.E+04 Escherichia coli Daily Load (10 9 /day) 1.E+03 1.E+02 1.E+01 1.E+00 1.E-01 Load at WQ Criterion Load at WQ Target EC Observations Existing Geomean Load WWTP Wasteload Allocation Wet Weather Influenced EC Observations Flow Exceedance Percentile
29 Outline Watershed Overview Pollutant Pollutant Source Assessment Technical Approach: Load Duration Curves TMDL Calculations
30 TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 TMDL = 1.E+01 1.E Flow Exceedance Percentile
31 TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 TMDL = Margin of Safety (TMDL x 0.05) 1.E+01 1.E Flow Exceedance Percentile
32 TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 TMDL = Margin of Safety (TMDL x 0.05) 1.E+01 1.E+00 WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) Flow Exceedance Percentile
33 TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 TMDL = Margin of Safety (TMDL x 0.05) WLA STORMWATER = (TMDL-MOS MOS-WLA WWTF ) X % of drainage area covered by storm water permits 1.E+01 1.E+00 WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) Flow Exceedance Percentile
34 TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 1.E+01 TMDL = Margin of Safety (TMDL x 0.05) LA=TMDL MOS WWTF - WLA MOS WWTF WLA STORMWATER WLA STORMWATER = (TMDL-MOS MOS-WLA WWTF ) X % of drainage area covered by storm water permits 1.E+00 WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) Flow Exceedance Percentile
35 TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 1.E+01 1.E+00 TMDL = Future Growth Margin of Safety (TMDL x 0.05) LA=TMDL MOS WWTF - WLA MOS WWTF WLA STORMWATER WLA STORMWATER = (TMDL-MOS MOS-WLA WWTF ) X % of drainage area covered by storm water permits WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) Flow Exceedance Percentile
36 TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 1.E+01 1.E+00 TMDL = Future Growth Margin of Safety (TMDL x 0.05) LA=TMDL MOS WWTF - WLA MOS WWTF WLA STORMWATER WLA STORMWATER = (TMDL-MOS MOS-WLA WWTF ) X % of drainage area covered by storm water permits WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) Flow Exceedance Percentile
37 TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 1.E+01 1.E+00 TMDL = Future Growth Additional Assimilative Capacity Margin of Safety (TMDL x 0.05) LA=TMDL MOS WWTF - WLA MOS WWTF WLA STORMWATER WLA STORMWATER = (TMDL-MOS MOS-WLA WWTF ) X % of drainage area covered by storm water permits WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) Flow Exceedance Percentile
38 TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 1.E+01 Final TMDL TMDL = Future Growth Additional Assimilative Capacity Margin of Safety (TMDL x 0.05) LA=TMDL MOS WWTF - WLA MOS WWTF WLA STORMWATER WLA STORMWATER = (TMDL-MOS MOS-WLA WWTF ) X % of drainage area covered by storm water permits 1.E+00 WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) Flow Exceedance Percentile
39 Final TMDL Allocations Unit TMDL (MPN/day) WLA a WWTF (MPN/day) WLA STORM WLA STORM WATER (MPN/day) LA (MPN/day) MOS (MPN/day) 1007B_ E E E E+11 b 9.15E B_ E E E E E C_ E E E E E E_ E E E E E L_ E E E+08 a WLA WWTF includes permitted current and future flows for WWTF
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