Carancahua Bay Watershed Protection Plan and TMDL I-Plan Michael - - PowerPoint PPT Presentation

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Carancahua Bay Watershed Protection Plan and TMDL I-Plan Michael - - PowerPoint PPT Presentation

Oct 04, 2022 218 likes •628 views

Carancahua Bay Watershed Protection Plan and TMDL I-Plan Michael Schramm 1 Overview Brief Recap SELECT Management Measures Measuring Success 2 Recap Load Reduction Curves to assess pollutant loads and identify needed

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Carancahua Bay Watershed Protection Plan and TMDL I-Plan

1

Michael Schramm

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 Brief Recap  SELECT  Management Measures  Measuring Success

Overview

2

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 Load Reduction Curves to assess

pollutant loads and identify needed reductions

 Identified 86% reduction in bacteria

loads required to meet water quality standards

Recap

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Recap

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  • Discussed and estimated possible sources
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 Ranked out possible

management measures

Recap

5

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SELECT

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Michael Schramm – Texas Water Resources Institute Uvashree Mohandass – Texas A&M Water Management and Hydrological Science April 24, 2018

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 Spatially Explicit Load Enrichment Calculation Tool

(SELECT)

 Characterize bacteria sources based on spatial (how things

are distributed across the landscape) factors

 Relies on:

◉ Land use ◉ Soil ◉ Population density estimates

Estimating Potential Enterococcus Loads

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SELECT

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Subwatershed boundaries Land Cover/ Land use Soils Livestock & Wildlife Populations Human Populations Bacteria Loading Rates

Best Available Data

Research NASS NLCD US Census Other Local, State, and Federal Datasets

Stakeholder Input

Landowner practices Local knowledge

Total Potential Loading

Identify the areas and sources with highest potential to impact water quality

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SLIDE 9

Enterococcus Potential Load Summary

9 3.67E+13 1.29E+12 1.57E+11 2.40E+07 9.67E+07 1.72E+12 1.00E+00 1.00E+01 1.00E+02 1.00E+03 1.00E+04 1.00E+05 1.00E+06 1.00E+07 1.00E+08 1.00E+09 1.00E+10 1.00E+11 1.00E+12 1.00E+13 1.00E+14 Cattle OSSFs Feral Hogs WWTFs (Recent Discharge) WWTFs (Permitted Discharge) Domestic Pets

Enterococcus Potential Load (cfu/day)

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Potential Loading from Cattle:

 Estimated 24,496 head  Annual Load 3.67×1013

cfu/yr

 Subwatersheds 1, 2, 6

GIS Analysis: Cattle

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GIS Analysis: Feral Hogs

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Potential Loading from Feral Hogs:

 Estimated 5,936 feral

hogs

 Annual Load 1.57×1011

cfu/yr

 Subwatersheds 1, 2

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GIS Analysis: OSSFs

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Potential Loading from OSSFs:

 Estimated 1,389 OSSFs  Annual Load 4.70×1013

cfu/yr

 Subwatersheds 2, 6

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GIS Analysis: Pets (Dogs & Cats)

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Potential Loading from Dogs:

 Estimated 937 dogs &

1,024 cats

 Annual Load 1.72×1012

cfu/yr (DRAFT)

 SELECT map is not

completed yet

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Potential Loading from WWTPs:

 3 WWTPs  Annual Load

8.75×109 cfu/yr

 Subwatershed 4

GIS Analysis: WWTPs Recent Discharge

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Potential Loading from WWTPs:

 3 WWTPs  Annual Load

3.53×1010 cfu/yr

 Subwatershed 4

GIS Analysis: WWTPs Permitted Discharge

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Source Potential Daily Loada Priority Subwatersheds Cattle 3.67×1013 1, 2, 6 Feral Hogs 1.57×1011 1, 2 OSSFs 1.29×1012 2, 6 Dogs & Cats 1.72×1012 (Pending final SELECT run)

(Pending final SELECT run)

Wastewater plants (Recent Discharge) 2.40×107 4 Wastewater plants (Permitted Discharge) 9.67×107 4

SELECT Summary

16 a in units of MPN/day

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Allen Berthold Texas Water Resources Institute 979-845-2028 taberthold@ag.tamu.edu

Contact Us

Michael Schramm Texas Water Resources Institute 979-458-9191 michael.schramm@ag.tamu.edu

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Management Measures

1

Michael Schramm Allen Berthold Ph.D. Stephanie Ruff Texas Water Resources Institute April 24, 2018

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1.

Develop and implement Water Quality Management Plans

  • r conservation plans

2.

Increase soil testing on agricultural lands

3.

Repair and replace failing OSSFs

4.

Develop voluntary OSSF inspection program

5.

Promote feral hog control and removal

6.

Promote effective pet waste management

Management Measures

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 Fund and hire a field technician ($75,000 per year)  Develop and implement 70 plans ($15,000 per plan)  Provide outreach and promotional material to increase

participation

 Estimated load reductions

◉ 3.75×1014 MPN/year Enterococcus ◉ 7.76×104 pounds of nitrogen per year ◉ 2.75×104 pounds of phosphorous per year

Develop and implement Water Quality Management Plans or conservation plans

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Currently 24 WQMPs covering 5,277 acres in the watershed

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 Soil testing by producers/property owners ($10 per test ~20

acres)

 Develop and implement soil testing campaign ($78,252

covers 156,505 acres of pastures and cropland)

 Estimated load reductions

◉ Unknown, nutrient reductions will be property and producer specific

Increase soil testing on agricultural lands

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 Develop and administer OSSF repair/replacement program  Repair and replace 42 septic tanks ($5 - $10k per system)  Estimated load reductions

◉ 9.67×1012 MPN/year Enterococcus ◉ 4.87×102 pounds of nitrogen per year ◉ 1.22×102 pounds of phosphorous per year

Repair and replace failing OSSFs

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 Develop and administer a voluntary OSSF inspection

program

 Estimated load reductions

◉ Unknown

Develop Voluntary OSSF Inspection Program

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 Construct fencing around deer feeders ($200 per feeder)  Trap, hunt, remove hogs on site  Deliver feral hog management workshops  Reduce population by 15% below current population

estimate

 Estimated load reductions

◉ 8.58×1012 MPN/year Enterococcus ◉ 5.68×103 pounds of nitrogen per year ◉ 2.03×103 pounds of phosphorous per year

Promote Feral Hog Removal and Control

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 Develop and deliver education and outreach materials to at

least 1,000 households

 Estimated load reductions

◉ 2.69×1013 MPN/year Enterococcus ◉ 88.2 pounds of nitrogen per year ◉ 20.4 pounds of phosphorous per year

Promote Effective Pet Waste Management

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 Part or full-time watershed coordinator  Continued and additional water quality monitoring

◉ Assess progress (next presentation) ◉ Limited dissolved oxygen data available

 Education and outreach

◉ General water quality education (Texas Watershed Stewards, Texas Well Owners Network, Lone Star Healthy Streams, Riparian Ecosystem, and others) ◉ Texas Stream Team volunteer monitoring ◉ Newsletters, websites, meetings, and other methods to increase awareness

Additional Needs

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 Needed bacteria load reduction to meet existing water

quality standards: 2.86×1014 MPN/year

 Potential bacteria load reduction with management

measures after 10 years: 4.20×1014 MPN/year

Total Potential Load Reduction

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Allen Berthold Texas Water Resources Institute 979-845-2028 taberthold@ag.tamu.edu

Contact Us

Michael Schramm Texas Water Resources Institute 979-458-9191 michael.schramm@ag.tamu.edu

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Measuring Success

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Michael Schramm Allen Berthold Ph.D. Texas Water Resources Institute April 24, 2018

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 Positive impacts on water quality might take a long time  Tracking water quality status and implementation progress is

critical to stay focused on the big picture

 Adaptive management is a process to adjust the plan if

things take a wrong turn

Measuring Success

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Water quality goals and targets

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2014 Integrated Report Dec 2008 – Nov 2016* 2025 Target 2030 Goal 7-yr Geometric Mean 124 MPN/100mL 67.3 MPN/100mL 57 MPN/100mL 35 MPN/100mL

* This is not the official data assessment for Carancahua Bay.

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10 20 30 40 50 60 70 80 2012 2025 2030

Percent Exceedances Year

Dissolved Oxygen Exceedances

Minimum DO Average DO

Water quality goals and targets

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 TCEQ Integrated Report on Surface Water Quality  Provide up to date 7-yr Geometric Mean for Enterococcus

and Binomial Test for Dissolved Oxygen and Nutrients

 Statistical trend analysis of water quality concentrations and

instream loads

Data Reviews

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 Milestones are established to evaluate implementation

progress

 Interim milestones helps break up seemingly large

milestones into more achievable actions

Project Milestones

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Project Milestones

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 The watershed plan is a living document  Review and revise as necessary  When do we need to revise the plan? – Adaptive

management

Adaptive Management

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 Formal review after 5 years  Three assessments for positive progress:

◉ Water quality – increase in pollutant concentrations and/or loads, increase in % exceedances ◉ Implementation progress – Substantial delays or lower than expected achievements ◉ External factors – Significant increases in population, changes in land use, economic factors, or other data that point to increases in pollutant sources or changes in hydrologic condition

 Two or more events should trigger changes in the plan

Adaptive Management

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 Are additional assessments/criteria warranted for adaptive

management?

Adaptive Management

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Allen Berthold Texas Water Resources Institute 979-845-2028 taberthold@ag.tamu.edu

Contact Us

Michael Schramm Texas Water Resources Institute 979-458-9191 michael.schramm@ag.tamu.edu