The Lower Rio Grande /Ro Bravo Water Quality Initiative (LRGWQI) - - PowerPoint PPT Presentation

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Jan 14, 2023 12 likes •164 views

The Lower Rio Grande /Ro Bravo Water Quality Initiative (LRGWQI) RIO GRANDE REGIONAL WATER PLANNING GROUP (RGRWPG) (REGION M) July 1, 2020 Roger Miranda, Ph.D., P .G. Texas Commission on Environmental Quality Water Quality Issues in the

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Roger Miranda, Ph.D., P .G. Texas Commission on Environmental Quality RIO GRANDE REGIONAL WATER PLANNING GROUP (RGRWPG) (REGION M) July 1, 2020

The Lower Rio Grande /Río Bravo Water Quality Initiative (LRGWQI)

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Segment Number Segment Description I mpairment Year Listed Concerns*

2302 Rio Grande Below Falcon Reservoir Bacteria 1996 Ammonia Nutrients Dissolved Oxygen 2301 Rio Grande Tidal NA NA Dissolved Oxygen Bacteria Nutrients

Water Quality Issues in the Lower Rio Grande/Rio Bravo

Summary of Water Quality Assessment Results : Lower Rio Grande From TCEQ’s 2020 Integrated Report

*S alinity is also a big local concern

230 1 2301 2302

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The Lower Rio Grande/Río Bravo Water Quality Initiative

*Binat ional effort t o rest ore and prot ect wat er qualit y

in t he Lower Rio Grande/ Río Bravo

*Conduct ed under t he auspices of t he Int ernat ional

Boundary and Wat er Commission (CILA/ IBWC)

*S

ix agencies involved: US Mexico IBWC, US EP A, TCEQ CILA, CONAGUA, S EDUMA/ CEAT

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Terms of Reference

* Exchange of Letters

S igned S eptember, 2013

* Developed Common

Terms of Reference (TOR) for the Proj ect

* The TOR established the

study area, goals and

bj ectives of the

proj ect and the structure of the binational working groups

* Established a Core

Group of agency representatives and a Binational Technical Work Group to advise the Core Group

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S tudy Area

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LRGWQI Obj ectives

Address current and future water quality issues
Evaluate management strategies for point sources
Evaluate other mechanisms and strategies to

improve water quality under steady-state conditions, including salinity management

uggest implementation strategies

Goal = “ Binational Watershed Based Plan”

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LRGWQI Obj ectives

Address current and future water quality issues
Evaluate management strategies for point sources
Evaluate other mechanisms and strategies to

improve water quality under steady-state conditions, including salinity management

uggest implementation strategies

Goal = “Binational Watershed Based Plan”

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Technical Approach

Binational Data Exchange
Historical Data Review
Identification of Data Gaps
Data Collection
Data Analysis and Modeling

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Technical Approach

Binational Data Exchange 
Historical Data Review 
Identification of Data Gaps 
Data Collection 
Data Analysis and Modeling 

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Work Completed S ince S eptember of 2013

ynoptic S urveys of Water Quality (2014-2016)

Watershed Characterization Report
Historical Data Review and Analysis
Point S
urce Analysis
Geospatial Analysis (Nonpoint S
urces)
5 LA-QUAL Models Developed
Decision S

upport S

ftware Developed

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LRGWQI Decision S upport S ystem

A decision support tool for the LRGWQI
Nonproprietary software (Open S
urce)
GIS

interface

imulates the effects on water quality of various planning scenarios*

Economics module

*Goal: suitable for planning needs - user needn’ t be a water quality modeler

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Next S teps in the LRGWQI

Establishment of a Local Binational Forum for Information

Exchange

Development of Binational Recommendations to improve water

quality

Completion of Binational WBP Based on Local Input
Institutionalization of Binational Agreement (Joint Engineering

Report, Exchange of Letters, or Treaty Minute)

Implementation –Additional S

takeholder Input, Binational financing and coordination

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http://www.tceq.texas.gov/waterquality/tmdl

Roger Miranda

roger.miranda@tceq.texas.gov (512)239-6278