Bacteria TMDLs for Halls Bayou November 10, 2008
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1 Bacteria TMDLs for Halls Bayou November 10, 2008 PARSONS
2 Outline Watershed Overview Pollutant Pollutant Source Assessment Technical Approach: Load Duration Curves TMDL TMDL Calculations
3 Halls Bayou Watershed ~20 square miles Located within 2 counties (Houston, Harris) Average Annual Rainfall 49.8 inches ((NOAA(NOAA 2007)
4 Land Use/Land Cover
5 303 (d) Listed Assessment Units (2008) Segment 1006D_ D_ I_ J_01 Water Body Halls Bayou below US 59 Halls Bayou above US 59 Unnamed Tributary of Halls Bayou Unnamed Tributary of Halls Bayou Description of Assessment Unit Not Supporting Contact Recreation Use Halls Bayou 1 mi. upstream of Confluence w/ Green's Bayou (downstream of Station 16666) Halls Bayou at Jensen Dr. in Houston Trib of Halls at Talton Dr. near Monterrey Ln. Trib of Halls Bayou at Langley Road in North Houston
6 Water Quality Stations
7 Assessment Unit E. coli Data for TCEQ Stations from 1996 to 2006 Station ID Geometric Mean Concentration Number of Samples Number of Samples Exceeding Single Sample Criteria % of Samples Exceeding 1006D_ % 1006D_ % 1006I_ % 1006J_ % * Geometric Mean Criteria for E. coli is 126 MPN/100mL and Single Sample Criteria is 394 MPN/100mL
8 Halls Bayou E. coli Geomeans
9 1.0E+06 Halls Bayou E. coli Longitudinal Profile Halls Bayou E. coli (MPN/100 ml) 1.0E E E E E E River Km 0 km is at confluence with Houston Ship Channel Solid symbol indicates tributary location 10 5 Legend Maximum 0 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) 1006D_ D_ D_ J_
13 Sanitary Sewer Overflows
14 Permitted Stormwater For WQ Segment Stream Name Total Area (acres) Area under MS4 Permit (Acres) Percent of Watershed under MS4 Jurisdiction 1006D_01 Halls Bayou below US 59 8,182 8,007 98% 1006D_02 Halls Bayou above US 59 18,090 18, % 1006I_01 Unnamed Tributary of Halls Bayou % 1006J_01 Unnamed Tributary of Halls Bayou 1,839 1, %
15 Population Projections Stream Name Assessment Unit Increase Halls Bayou below US D_01 40,164 51,824 23% Halls Bayou above US D_02 95, ,775 21% Unnamed Tributary of Halls Bayou 1006I_ % Unnamed Tributary of Halls Bayou 1006J_01 9,256 13,143 30% Source: HGAC 2007
16 On-Site Sewage Facilities
17 On-Site Sewage Facilities Segment 1006D_ D_ I_ J_01 Stream Name Halls Bayou below US 59 Halls Bayou above US 59 Unnamed Tributary of Halls Bayou Unnamed Tributary of Halls Bayou OSSF Estimate using 1990 Census method 0 4, ,157 a Using 12% failure rate.
18 Estimated Number of Pets Segment Stream Name Dogs Cats 1006D_01 Halls Bayou below US 59 10,956 12, D_02 Halls Bayou above US 59 15,400 17, I_01 Unnamed Tributary of Halls Bayou 1,220 1, J_01 Unnamed Tributary of Halls Bayou 3,433 3,907
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 Halls Bayou Watershed USGS Gage Number Name Period of Record Data Type Halls Bayou at Houston, TX 11/ /1993 and 10/ Present 10/ Present Discharge (cfs) Gage Height (ft) * Highlight - USGS gage station used to project flows.
22 Flow Percentiles Segment 1006D_ D_ I 1006J NRCS Curve Number Average Annual Rainfall (inch) Percentile Q (cfs) Q (cfs) Q (cfs) Q (cfs) 0 12,005 7,
23 LDC Schematic
24 1.E+06 Load Duration Curve for Halls Bayou below U.S. 59 (1006D_01) Escherichia coli Daily Load (10 9 /day) 1.E+05 1.E+04 1.E+03 1.E+02 1.E+01 Load at Single Sample WQ Criterion Load at Single Sample WQ Target EC Observations WWTP Wasteload Allocation Wet Weather Influenced EC Observations Existing Geomean Load 1.E+00 1.E Flow Exceedance Percentile
25 Load Duration Curve for Halls Bayou above U.S. 59 (1006D_02) 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 1.E+01 Load at Single Sample WQ Criterion Load at Single Sample WQ Target EC Observations WWTP Wasteload Allocation Wet Weather Influenced EC Observations Existing Geomean Load 1.E+00 1.E Flow Exceedance Percentile
26 1.E+04 Load Duration Curve for Unnamed Tributary of Halls Bayou (1006I_01) 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 1.E-03 Load at Single Sample WQ Criterion Load at Single Sample WQ Target EC Observations WWTP Wasteload Allocation Wet Weather Influenced EC Observations Existing Geomean Load Flow Exceedance Percentile
27 Load Duration Curve for Unnamed Tributary of Halls Bayou (1006J_01) 1.E+07 1.E+06 Escherichia coli Daily Load (10 9 /day) 1.E+05 1.E+04 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 WWTP Wasteload Allocation Wet Weather Influenced EC Observations Existing Geomean Load 1.E-01 1.E Flow Exceedance Percentile
28 Outline Watershed Overview Pollutant Pollutant Source Assessment Technical Approach: Load Duration Curves TMDL TMDL Calculations
29 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
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 = Margin of Safety (TMDL x 0.05) 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+00 WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) 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) 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
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 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
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 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
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 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
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 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
38 Final TMDL Allocations Assessment Unit TMDL (MPN/day) WLA WWTF (MPN/day) WLA STORM WATER (MPN/day) LA (MPN/day) MOS (MPN/day) 1006D_ E E E E E D_ E E E E I_ E E E E J_ E E E E+09 a b WLA WWTF = WLA WWTF + Future Growth LA includes upstream loads
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