LECTURE #1 INTRODUCTION TO BASINS. 1 of 38 WHAT IS EPA’S BASINS ? Better Assessment Science Integrating Point and Nonpoint Sources Integrated GIS, data.

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Presentation transcript:

LECTURE #1 INTRODUCTION TO BASINS

1 of 38 WHAT IS EPA’S BASINS ? Better Assessment Science Integrating Point and Nonpoint Sources Integrated GIS, data analysis and modeling system designed to support watershed based analysis and TMDL development Data: national (US) data sets with options to import local data Tools: provide quick access to analysis techniques for watershed assessment Models: provide more detailed analysis and predictive evaluations to support studies

2 of 38 WHAT IS THE PURPOSE OF BASINS? To assist in watershed management and TMDL development by integrating data, tools, and models. Examples of uses: Characterizing water quality data Identifying pollution sources Investigating Load Allocations Climate Change Assessment

3 of 38 BASINS DEVELOPMENT PHILOSOPHY Builds on existing, documented technology Integrates existing models (i.e., HSPF, SWAT, EPA SWMM, AQUATOX) Incorporates national derived data layers (i.e., PCS, STORET…) Ease of use GIS technology supports organization, display, selection, and analysis of information Windows technology provides graphical user interfaces (GUI) that facilitate interaction with the data and analytical tools Automatic linkage streamlines the flow of information Open Platform Open Source Extensible architecture based on robust objects

4 of 38

5 of 38 WHAT IS BASINS AGAIN? Multipurpose environmental analysis system Developed by EPA’s Office of Water Designed for performing watershed and water quality-based studies Implemented through a customized GIS interface Or, a software framework that holds and links data, tools, and models

6 of 38 BASINS VERSIONS 1.0 – May – May – January – January – June – June – August 2004 incremental release3.1 – August 2004 incremental release 4.0 – March – March 2007 Update 1 – November 2007 Latest Update – February 2013

7 of 38 BASINS 4.0 Builds off BASINS 3.1 Significant restructuring to be GIS platform independent Accommodating both ArcView 3.x and ArcGIS Based on a non-proprietary, open-source GIS foundation (MapWindow)

8 of 38 MAPWINDOW BACKGROUND Originally developed at the Utah Water Research Laboratory at Utah State University Developed to assist in watershed management related activities and funded by a variety of agencies and organizations including the Idaho National Engineering Laboratory. Development and maintenance of core GIS components and additional plug-ins at Idaho State University, Utah State University, AQUA TERRA Consultants, and many others.

9 of 38 BASINS 4.0 GIS INTERFACE

10 of 38 OPEN SOURCE ADVANTAGES No need to purchase expensive proprietary GIS products Source code for all components, including the foundational GIS software, will always be available to end users and the federal government Provides greater stability and transparency Open framework readily allows for inclusion of additional models and tools

11 of 38 MAPWINDOW GIS FUNCTIONALITY Ability to add components using a plug-in extension interface Active and supportive international developer community Supports both vector and raster data manipulation in most common file formats

12 of 38 BASINS DATA Select data layers to display Zoom to area of interest Data included: Streams - Reach File 1, NHD Watershed boundaries Point source locations Monitoring locations

13 of 38 BASINS SPATIALLY- DISTRIBUTED DATA Land use and land cover (shape and grid) Urbanized areas Reach file 1 National Hydrography Data (NHD) Major roads TIGER Line Files (detailed roads and census boundaries) USGS hydrologic unit boundaries (accounting and catalog units) EPA region boundaries State boundaries County boundaries DEM (shape and grid) National Elevation Dataset (NED) Ecoregions NAQWA study unit boundaries Soil (STATSGO)

14 of 38 BASINS ENVIRONMENTAL MONITORING DATA Bacteria monitoring station summaries Permit compliance system (PCS) sites and computed annual loadings Meteorological data USGS NWIS daily values, water quality, and streamflow measurements Modernized STORET

15 of 38 BASINS DATA DOWNLOAD TOOL Automatically downloads selected data from the web Projects shape and grid data Imports layers into the BASINS project

16 of 38 BASINS WATERSHED CHARACTERIZATION REPORTS Permitted Point Source Facilities Table 1990 Population and Sewerage by Census Tract 2000 Population and Census Tract Table 303d Listed Segment Tables Landuse Distribution Table Point Source Discharge Concentration and Loading Table Water Quality Observations Stations Table Plus custom reports through scripts

17 of 38 MODELING CAPABILITIES IN BASINS Models to address multiple objectives –Source assessment –Receiving water evaluation Models which operate on various scales –Local scale –Watersheds –Basins Models which can be applied at various levels of complexity –Screening –Detailed

18 of 38 BASINS MODELS PLOAD –Screening tool –Provides estimates of nonpoint sources of pollution on an annual average basis –Models any user-specified pollutant –Uses either the export coefficient or simple method approach

19 of 38 BASINS MODELS AQUATOX –Simulation model for aquatic systems –Predicts the fate of various pollutants, such as nutrients and organic chemicals, and their effects on the ecosystem, including fish, invertebrates, and aquatic plants –Core model distributed separately from BASINS

20 of 38 HSPF / WinHSPF (Hydrologic Simulation Program, FORTRAN) –Continuous simulation watershed model with fixed, user-selected, time steps –Predicts loadings and instream water quality in mixed land use watersheds for: Nutrients Toxics Bacteria Sediment –Data provided to Windows interface through a BASINS plug-in BASINS MODELS

21 of 38 SWAT – USDA’s Soil and Water Assessment Tool BASINS MODELS –Physical based, watershed scale model –Developed to predict impacts of land management practices on water, sediment, and agricultural chemical yields in large complex watersheds –BASINS 3.1 version closely tied to ArcView’s scripting language; BASINS 4.0 compatible version included in May 2010 update –Expedites set-up process for SWAT users, and provides BASINS with another sophisticated watershed model

22 of 38 EPA’s WASP – Water Quality and Analysis Simulation Program –Dynamic compartment-modeling program for aquatic systems –Supports development of TMDLs and waste load allocations –Plug-in development a collaborative effort among the BASINS development team and EPA Region 4 –Expedites set-up process for WASP users, and provides BASINS with an established dynamic water quality model BASINS MODELS

23 of 38 EPA’s SWMM – Stormwater Management Model –Dynamic rainfall-runoff simulation model for primarily urban areas / drainage systems –Can also estimate the production of pollutant loads –BASINS Plug-in development a collaborative effort among the BASINS and SWMM development teams –Expedites set-up process for SWMM users, and provides BASINS with a premier urban drainage model BASINS MODELS

24 of 38 MODELS ‘COMING SOON’ TO BASINS GWLF – Generalized Watershed Loading Functions from Penn State –“Mid-level” model, based on GWLF (Haith and Shoemaker, 1987) –Previously implemented in ArcView (AVGWLF) –Simulates runoff, sediment, and nutrient loads –BASINS plug-in is being developed by Penn State

25 of 38 CONNECTION BETWEEN BASINS AND HSPF BASINS/GIS data layers provided for HSPF setup –DEM (grid) Used to determine the boundaries of the subwatersheds when delineating. –Land Use (NLCD or GIRAS) Used to calculate land use distributions within each subwatershed. Each land use is parameterized separately. –Reach File, Version 1; NHD/NHDPlus One representative reach is selected for each subwatershed. Shapefile is used to determine some of the necessary inputs associated with the stream network setup within the model

26 of 38 BASINS data provided for HSPF –Permit Compliance System (PCS) Nodes for PCS sites are added when delineating the subwatersheds. PCS loading information input to HSPF. –BASINS Meteorological Data Meteorological data provided for over 16,000 stations throughout the U.S. –STORET Data Users can download water quality data from the EPA STORET website. –USGS Data Users can download discharge, water quality observations, and streamflow measurements from the USGS NWIS website. CONNECTION BETWEEN BASINS AND HSPF

27 of 38 “It is a national goal that the discharge of pollutants into the navigable waters be eliminated by 1985.” Total Maximum Daily Load (TMDL) focused on protection of surface water resources –Streams –Reservoirs –Estuaries The ultimate goal of the TMDL process is to meet the water quality standards and ultimately improve habitat in a watershed. HOW BASINS ASSISTS IN TMDL DEVELOPMENT: BACKGROUND Clean Water Act Objective:

28 of 38 THE TMDL PROGRAM The TMDL program –Requires states to develop TMDLs for waters on the 303(d) list Section 303(d) requires the identification and prioritization of waters not meeting in-stream water quality standards –The TMDL includes a distribution of pollutant loading (allocation) that results in attainment of water quality standards Five key steps to TMDL development –Identify water quality-limited waters (303(d) list) –Prioritize water quality-limited waters –Develop the TMDL plan for each water quality limited stream segment –Implement the water quality improvement for each segment –Assess water quality improvement for each segment

29 of 38 TMDL FOCUS To determine the amount of pollution the water is capable of assimilating while maintaining its intended beneficial uses.

30 of 38 EPA TMDL EQUATION Managers and Engineers Politicians and Scientists State water quality standard for the pollutant given the stream’s designated beneficial use TMDL = WLA + LA + MOS (total max. daily load) (point source waste load allocation) (nonpoint load allocation) (margin of safety) TMDL development phase Citizens

31 of 38 WHAT ARE EPA’S EXPECTATIONS AND RECOMMENDATIONS? Scientific proof –Must use credible tools for data analysis Data –CWA requires the use of credible and defensible data for decision making –Monitoring Monitoring is required to prove the TMDL is appropriate and requirements are being met.

32 of 38 MODELING IN THE TMDL PROCESS 1.What is the current loading in the stream? 2.What is the maximum loading a stream can receive without exceeding the assimilative capacity? 3.What will be the loading under proposed load allocations?

33 of 38 ASSIMILATIVE CAPACITY TECHNICAL TOOLS Point Sources Linkage between discharges and waterbody response Simple dilution models, steady-state water quality simulations (QUAL2E), dynamic water quality simulation (WASP) depend on pollutant type and waterbody Nonpoint Sources Linkage between all sources and waterbody response Nonpoint source is wet-weather driven and critical condition may be at medium or high flow condition Watershed-receiving water response models (HSPF, SWMM, any linked watershed and receiving model)

34 of 38 TMDL TYPES Point sources and low flow condition –Use steady state model –Use an appropriate design flow –Determine the magnitude of the impairment and endpoint –Develop scenarios of point source waste load allocations that will meet the allowable assimilative capacity

35 of 38 TMDL TYPES Point and nonpoint sources –Probably need a time varying model –Include all sources and define when and where impairments occurs (critical condition) –Calculate loading under existing condition –Calculate loading under allocation scenarios that meet the target/standard –May need to negotiate with stakeholders

36 of 38 NONPOINT SOURCE TMDLS Time C mg/l Criteria/standard Existing condition Allocation Scenario Scenario obtained through control of : 20% loading from Ag 15% from pastureland 20% urban 12% from point sources Modeling Approach: Use Continuous Simulation (HSPF) Define critical/representative period

37 of 38 ISSUES IN TMDL DEVELOPMENT Scarcity of data in space and time Uncertainty in data and models Limitations in data analysis tools Difficulty with stakeholder involvement and input Limited expertise Limitations of models

38 of 38 WHERE DOES BASINS FIT INTO THE TMDL PROCESS? Minimizes data collection Provides data visualization tools Provides simple data analysis tools Provides water quality models and data for populating models Models provide a framework for scenario generation and TMDL allocations. Communication with stakeholders through GIS and modeling output