Post on 04-Jan-2016
description
Bacteria and Dissolved OxygenBacteria and Dissolved OxygenTotal Mass Daily Load DevelopmentTotal Mass Daily Load Development
for thefor the
Atascosa RiverAtascosa RiverJessica L. WattsJessica L. Watts
TMDL OverviewTMDL OverviewA TMDL is a tool for implementing state water quality standards. It A TMDL is a tool for implementing state water quality standards. It
is based on the relationship between sources of pollutants and is based on the relationship between sources of pollutants and in-stream water quality conditions.in-stream water quality conditions.
TMDL = LC = WLA + LA + MOSTMDL = LC = WLA + LA + MOS
LA
WLA
MOS
TMDLwhere:where:
LC = LC = loading loading capacitycapacityWLA = WLA = wasteload wasteload allocationallocationLA =LA = load load allocation; andallocation; andMOS =MOS = margin of margin of safetysafety
Natural Water QualityNatural Water QualityAssessment and ControlAssessment and Control
Priority Ranking and Targeting
Assessment of Water Quality-Based Control
Actions
Identification of Water Quality-Limited Waters
Development of TMDLs
Implementation of Control Actions
Components of TMDL Development
1. Problem Identification2. Identification of water quality indicators and targets3. Source assessment4. Linkage between water quality targets and sources5. Allocations6. Follow-up monitoring and evaluation7. Assembling the TMDL
1.1. What are the What are the Designated UsesDesignated Uses and and Associated Impairments Associated Impairments of the river?of the river?
2.2. What What DataData are readily available? are readily available?
3.3. What is the What is the Geographic SettingGeographic Setting of the TMDL? of the TMDL?
4.4. What are the What are the Exacerbating CharacteristicsExacerbating Characteristics of the river and its watershed? of the river and its watershed?
5.5. What are the What are the Pollutant Sources Pollutant Sources andand Pathways Pathways??
What temporal considerations affect the TMDL?What temporal considerations affect the TMDL?
How will margin of safety be addressed in the TMDL?How will margin of safety be addressed in the TMDL?
What are some potential control options?What are some potential control options?
Key Questions Considered for Key Questions Considered for Problem IdentificationProblem Identification
The Atascosa River’sThe Atascosa River’sdesignated usesdesignated uses
Aquatic LifeAquatic Life Subcategory – HighSubcategory – High Has NO known Federally Endangered or Has NO known Federally Endangered or
Threatened Aquatic SpeciesThreatened Aquatic Species Contact RecreationContact Recreation GeneralGeneral Fish ConsumptionFish Consumption Public Water SupplyPublic Water Supply
Key Question #1: What are the Designated Uses and Associated Impairments of the River?
Associated Impairments/Associated Impairments/2004 Concerns2004 Concerns
US
28
1
25 Miles Surrounding US 281
Concerns
Contact Recreation UseContact Recreation Use
BacteriaBacteria
Nutrient Enrichment ConcernNutrient Enrichment Concern
AmmoniaAmmonia
Algal Growth ConcernAlgal Growth Concern
Excessive Algal GrowthExcessive Algal Growth
Public Water SupplyPublic Water Supply
Total Dissolved Solids
Lower 25 Miles
Concerns
Public Water SupplyPublic Water Supply
Total Dissolved Solids
Remainder of Segment
Concerns
Public Water SupplyPublic Water Supply
Total Dissolved Solids
Readily Available InformationReadily Available InformationInformation was downloaded from the web, including:Information was downloaded from the web, including:
EPA Basins:EPA Basins: River ReachesRiver Reaches Soil Information (STATSGO)Soil Information (STATSGO) Major RoadsMajor Roads HUC BoundaryHUC Boundary Dam SitesDam Sites CountiesCounties EcoregionsEcoregions Water Quality Monitoring Station SummariesWater Quality Monitoring Station Summaries Bacteria Monitoring Station SummariesBacteria Monitoring Station Summaries Weather Station SitesWeather Station Sites USGS Gaging StationsUSGS Gaging Stations Clean Water Needs SurveyClean Water Needs Survey Industrial Facilities Discharge SitesIndustrial Facilities Discharge Sites Permit Compliance System Sites and LoadingsPermit Compliance System Sites and Loadings CERCLIS – Superfund National Priority ListCERCLIS – Superfund National Priority List RCRIS – Resource Conservation and Recovery RCRIS – Resource Conservation and Recovery
Information SystemsInformation Systems Mineral Industry LocationsMineral Industry Locations
USGS Seamless:USGS Seamless: AquifersAquifers National Elevation DatasetNational Elevation Dataset 1992 Land Use1992 Land Use
USGS – NHD:USGS – NHD: PointsPoints WellsWells Gaging StationsGaging Stations FlowlinesFlowlines WaterbodiesWaterbodies
PRISMPRISM PrecipitationPrecipitation
Key Question #2: What Data are readily Available?
Geographic SettingGeographic Settingof theof the
Atascosa RiverAtascosa River
Key Question #3: What is the Geographic Setting of the TMDL?
Land UseLand Use Key Question #4: What are the Exacerbating Characteristics of the river and its watershed?
Point Source Pollutant SourcesPoint Source Pollutant Sources
Legend
1 CERCLIS - Superfund
6 NPDES
11 Industrial Facilities Discharge
40 Mineral Industry
Key Question #5: What are the Pollutant Sources and Pathways?
Pollutant PathwaysPollutant Pathways
Use of GIS in Pollutant Transport ModelingUse of GIS in Pollutant Transport Modeling
How GIS Fits Into How GIS Fits Into BASINSBASINS& the TMDL Process& the TMDL Process
MeteorologicalData
GIS
Landuse and pollutantspecific Data
HSPFHSPF
LanduseDistribution
StreamData
Point Sources
Core Model
Post Processing
Windows interface
Landscape dataAB
D
E
F
C
CH2MHILL
Atascosa DEM Terrain ProcessingAtascosa DEM Terrain Processing
Atascosa Subwatershed CreationAtascosa Subwatershed Creation
33 Catchments 2 Gaging Stations and
1 Outlet
_____________________
36 Subwatersheds
Used a Threshold of 60 to create
What’s NextWhat’s NextBASINS Predefined Delineation ProcessBASINS Predefined Delineation Process
Shapefiles and TablesShapefiles and Tables• SubbasinsSubbasins• StreamsStreams• OutletOutlet
Questions?
Picture by: James Hindes
http://www.pbase.com/jhindes/the_river
Acknowledgements
Dr. David Maidment
Nate Johnson
Carrie Gibson