1102F_01 Hanadi Rifai, Rose Sobel, and Amin Kiaghadi Civil and - - PowerPoint PPT Presentation

▶
1102f 01
SMART_READER_LITE
LIVE PREVIEW

1102F_01 Hanadi Rifai, Rose Sobel, and Amin Kiaghadi Civil and - - PowerPoint PPT Presentation

Nov 11, 2023 211 likes •415 views

Total Maximum Daily Load for Marys Creek Bypass 1102F_01 Hanadi Rifai, Rose Sobel, and Amin Kiaghadi Civil and Environmental Engineering University of Houston Houston Galveston Area Council Bacteria Implementation Group Spring Meeting

slide-1
SLIDE 1

Hanadi Rifai, Rose Sobel, and Amin Kiaghadi Civil and Environmental Engineering University of Houston

Total Maximum Daily Load for Mary’s Creek Bypass 1102F_01

Houston Galveston Area Council Bacteria Implementation Group Spring Meeting

June 5, 2018

slide-2
SLIDE 2

Project Objectives

  • Develop TMDL for Assessment Unit:

– 1102F_01: Mary’s Creek Bypass

  • Support Public Participation
slide-3
SLIDE 3

Key Steps in TMDL Development

  • Data compilation and analysis
  • Pollution source assessment
  • Development of Flow Duration Curves (FDCs)

and Load Duration Curves (LDCs)

  • Development of Total Maximum Daily Load
slide-4
SLIDE 4

WATERSHED CHARACTERISTICS

Data compilation and analysis

slide-5
SLIDE 5

Mary’s Creek Bypass

Area (ac) 1309.6

Legend

Project Segment Project watershed Clear Creek Watershed

slide-6
SLIDE 6

Land Cover and Population

Watershed Population (2010 Census) 6,820

slide-7
SLIDE 7

Precipitation

Average Annual Precipitation (in) 52.5

HCOEM 2005–2015

slide-8
SLIDE 8

INDICATOR BACTERIA

Data compilation and analysis

slide-9
SLIDE 9

Station Locations & Impairment History

AU ID Station ID Geometric Mean Concentration (MPN/100ml) Number of Samples % of Samples Exceeding 1102F_01 17917 159.39 10 10% 18639 10 10%

Date range: 2006 to 2007 Geometric Mean Criterion: 126 MPN/100 ml Contact Recreation Use NS Year 1st on 303(d) list 2014 Stream Length (mi) 2.37 NS= Not Supporting

slide-10
SLIDE 10

PERMITTED AND NON-PERMITTED SOURCES

Pollution source assessment

slide-11
SLIDE 11

Legend

Project Segment Project watershed City limit MS4 Permitted Area

Permitted Sources

Regulated Entity Name Permit Number Total Area (acres) Area under MS4 Permit (Acres) % Watershed under MS4 Jurisdiction

City of Pearland MS4

TXR040208 1309.6 1241.3 95%

Brazoria Drainage District 4

TXR040144

City of Friendswood

TXR040233

Galveston County Consolidated Drainage District

TXR040067 No TPDES permitted facilities discharging to 1102F_01

slide-12
SLIDE 12

Sanitary Sewer Overflows

Facility Name NPDES Permit No. Facility ID Number Date Amount (Gallons) City of Pearland TX0032743 10134-003 1 12/13/2001 22,000 Gulf Coast Waste Disposal Authority TX0069728 11571-001 1 4/17/2008 300

slide-13
SLIDE 13

On Site Sewage Facilities

On-Site Sewage Facilities (OSSFs) 82

slide-14
SLIDE 14

Non-Permitted Sources: Animals

Pets Dogs Cats 1,411 1606

USDA

Livestock not a significant source

slide-15
SLIDE 15

DEVELOPMENT OF FDC, LDC, AND TMDL

slide-16
SLIDE 16

USGS Gages for Flow Projection

Gage #

Developed Forest/ Wet-land Drainage Area (acres) Mean Flow (cfs)

08177700 78% 7% 13,279 33.3 08178565 99% 1% 4,863 17.1

slide-17
SLIDE 17

Load Duration Curve for Mary’s Creek Bypass (1102F_01)

slide-18
SLIDE 18

TMDL Calculations for Mary’s Creek Bypass

Segment TMDL WLAWWTF WLA STORM WATER LA MOS Future Growth (Billion MPN/day) 1102F_01 20.739 0.0 18.717 0.985 1.037 0.0 TMDL = Maximum allowable load MOS (margin of Safety) = TMDL x 0.05 WLAWWTF = Sum of loads from the WWTF discharging WLASTORMWATER = (TMDL – MOS –WLAWWTF)*(% of drainage area under MS4 permits) LA = TMDL – MOS –WLA WWTF –WLA STORMWATER-Future growth Future Growth = Projected increase in WWTF permitted flows*126*conversion factor

slide-19
SLIDE 19

Next Steps

  • Support TMDL program in development of

draft WQMP update for Mary’s Creek Bypass

Photo of Mary’s Creek Bypass