EPA Drinking Water Mapping Application (DWMA)

Authors:

James Sinnott, RTI International (presenter)

Jay Rineer, RTI International

William Cooter, RTI International

Roger Anzzolin, US EPA, Office of Ground Water and Drinking Water

AWRA 2004 Spring Specialty Conference

GIS and Water Resources III

May 19, 2004

The work described in this presentation was funded by the U.S. Environmental Protection Agency under Contract 68-C-01-001 with Research Triangle Institute (RTI). RTI gratefully acknowledges this support.

Disclaimer: Although the research described has been funded wholly or in part by the U.S. Environmental Protection Agency Contract 68-C-01-001 to Research Triangle Institute, it has not been subject to the Agency's review and therefore does not necessarily reflect the views of the Agency, and no official endorsement should be inferred. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.

Disclaimer: In the interest of protecting certain types of information, and in accordance with EPA protocol, the GIS data displayed in the following images were rendered for display purposes only and do not accurately represent actual data from EPA’s spatial databases.

Acknowledgements

DWMA Overview

Data Sources

Web Interface and Tools

Query Functionality

System Architecture

Presentation Outline

A secure Web-based geospatial application for US EPA Office of Ground Water and Drinking Water

Enables queries of the Safe Drinking Water Information System (SDWIS/FED) with other federal and state data

Identifies potential risks to surface water and groundwater used for public drinking water

Generates query driven maps and reports at a variety of spatial scales

DWMA Overview

Drinking water sources (intakes and wells) from SDWIS/FED

Source water (protection) areas from states (SWAs)

Point sources of contamination including dischargers, hazardous waste sites, Superfund sites, and state sources

Non-point sources of contamination including USGS nitrogen fertilizer use, herbicide use, and USDA animal waste

Surface waters represented by the NHD in the RAD

Groundwater represented by USGS groundwater regions, principal aquifers, and groundwater atlas

A variety of other layers from EPA IGD and RAD and USGS

Data Sources

Web Interface

Header Frame (standard EPA template)

Tab Frame

Query Frame

Map Frame

Combines queries and maps

Header Frame

Tab Frame

Map FrameQuery Frame

Driving the DWMA

Drill-Down Tool

Drill-down Functionality

Show states matching query definition at national scale

Click on state, show matching counties served at state scale

Click on county, show matching water sources at local scale

National Scale

State Scale

Local Scale

Use of Existing Web Reports

Custom hyperlinks to existing EPA web reports available for:

EPA PCS, RCRIS, and CERCLIS sites

Drinking water systems

RAD impaired waters, water quality standards, and no discharge zones

SDWIS/FED Query Functionality

Tabs of interest defined by client

Locate public water sources by location, type, size, and violations

Check for Clean Water Act (CWA) protection

Identify potential upstream point sources of contamination

Identify potential nearby point sources of contamination

Identify sources drawing from areas with elevated non-point source impacts

Find interactions between any of the above

Surface Water Protection Areas

Looking for potential contaminant risks within protection areas

Non-Point Sources

Correlating drinking water violations and potential NPS impacts

Topographic Maps

Aerial Photos

Note: The mapped objects (e.g., SWAs and sources) in the topographic and aerial photograph views were rendered for display purposes only and do not represent actual GIS data.

System ArchitectureIntegrated with EPA’s WATERS info. systemWeb browser client (IE or Netscape)Mapping/web server middleware

ESRI ArcIMS 4.0 Microsoft IIS with Active Server Pages Oracle Net8 and Oracle Objects for OLE

Databases Two separate Oracle databases Oracle Enterprise Edition 8.1.7 and ArcSDE 8.1.2 Oracle PL/SQL procedures

System Architecture Diagram

DWMA

Oracle ArcSDE

IE or NetscapeApplication Interface

(Customized ArcIMS HTML Viewer)

ArcIMS Spatial Server

WATERS

Browser Clients

Web and ArcIMS Servers

SSL

Databases

ASP and Custom DLL

OO4O

ArcIMS Connector

Internet Information Server (IIS)

ArcIMS Manager

Default ArcIMS Servlet

ArcIMS Application Server

Envirofacts

Periodic batch updates

RADIGD

Oracle ArcSDE

ENVIRO

DWMA

WATERS

ENVIRO

OTHER

Only accessible on EPA intranet

User login validated against database

Users authenticated programmatically

Sessions timed out after 20 minutes of inactivity

All data transfers encrypted through Secure Socket Layer (SSL)

ArcIMS map services secured

Security for Sensitive EPA Drinking Water Data

A simple internet browser can be turned into a powerful mapping and query tool by wrapping a customized ArcIMS HTML viewer with additional frames to build queries

Such an interface allows one to easily tap into multiple ArcSDE geodatabases and existing web reports

Database level services (e.g., navigation) can be shared and leveraged by multiple applications

For more information contact: Roger Anzzolin, US EPA Anzzolin.Roger@epa.gov

James Sinnott, RTI International jsinnott@rti.org

Conclusions