Wendy Welch ADAPTING THE ARC HYDRO DATA MODEL AND TOOLS TO A HYDROGEOLOGIC FRAMEWORK KITSAP PENINSULA, KITSAP, MASON AND PIERCE COUNTIES, WASHINGTON

Background Research Problem Proposed Methods Geology Component Borehole Component Hydrostratigraphy Component Conclusion Projected Timeline Anticipated Results References PRESENTATION OUTLINE

USGS WA Water Science Center Collects statewide hydrologic data (surface and groundwater data) Performs water resource investigations (quality and quantity) Work with federal, state and local agencies to solve water issues BACKGROUND U.S. GEOLOGICAL SURVEY PROJECTS

Definition: 3D model of the subsurface hydrogeologic units; water bearing aquifers and confining units Needed for greater understanding of groundwater characteristics and flow directions. Created by incorporating hydrogeologic and geologic maps, well logs with borehole data and cross sections. Can be used for conceptual understanding or as input to numerical flow and transport simulation models BACKGROUND HYDROGEOLOGIC FRAMEWORK

Surficial geologic maps compiled from variety of sources and merged into one shapefile. Well data is retrieved from USGS NWIS (National Water Information System) database MS Excel is used to store and manage well data Well data is exported to shapefile format for plotting in Arc Map Cross sections are made using A Prime’s CrossView in Arc Map Hydrogeologic unit (HGU) assignments are made and edited in Excel tables Surfaces representing the tops of each HGU are interpolated using Spatial Analyst tools Final surfaces viewed in CrossView BACKGROUND CURRENT METHODS

Kitsap GW study ~790 sq. miles 20 1:24k geologic maps merged >2,000 wells with lithologic information 11 unique hydrogeologic units (aquifers and confining units) BACKGROUND CASE STUDY

Arc Hydro Groundwater (AHGW) is a data model and related set of tools for managing, analyzing and visualizing groundwater information Originally Arc Hydro was developed for surface water resources. Expanded to include groundwater data Gil Strassberg developed AHGW data model for doctoral studies at University of Texas at Austin Center for Research in Water Resources Data model components: BACKGROUND ARC HYDRO DATA MODEL COMPONENTS Image from Strassberg and others, 2010

3 Toolsets developed by Esri and Aquaveo TM that use groundwater information from the data model as a foundation. Groundwater Analyst Import existing data into AHGW data model (geodatabase) Edit attributes Manage well data Subsurface Analyst Visualizing borehole logs Creating and editing cross sections Making 2D sections and volumes MODFLOW Analyst Create, archive and visualize MODFLOW models * not used for this project BACKGROUND ARC HYDRO GROUNDWATER TOOLS

USGS allows for a lot of freedom for scientists to select methods and software that are appropriate for their individual projects. Benefits: Fosters curiosity in new technology. Flexibility in determining best fit. Challenges: Difficult to coordinate users if communication is limited. Inefficient process if individuals are researching new software independently. Hard to share or incorporate data from other projects, even within one science center if data is not managed in a universal structure RESEARCH PROBLEM NEED FOR STRUCTURE

Helps to standardize groundwater and hydrogeologic datasets and maintain organization Geodatabase design is scalable – elements can be added or removed but the basic structure remains Data model and tools work within ArcGIS - the standard GIS software of the USGS Tools have 3D visualization and analytic advantages over current methods RESEARCH PROBLEM WHY AHGW?

Geodatabase can be imported from tool in Groundwater Analyst Gdb can be customized to meet project needs Coded value domains for certain attributes are used to increase efficiency and maintain integrity of data when editing Features are related using HydroID attribute PROPOSED METHODS AHGW GEODATABASE

Geologic maps form starting point for hydrogeologic studies Represent geologic units at land surface Kitsap project required compilation and edge- matching over 20 1:24,000 geologic map quadrangles When final shapefile of surficial geology is complete, data is loaded into the GeologyArea polygon feature class of the AHGW geodatabase PROPOSED METHODS GEOLOGY COMPONENT

BoreholeLog table Represents vertical data along borehole Relates to HydroID of Well feature class using WellID Data is loaded from MS Excel into BoreholeLog table using data loader wizard PROPOSED METHODS BOREHOLE COMPONENT

Hydrogeologic units are assigned to different elevations along borehole. HGU assignments are the basis for further analysis and processing Subsurface Analyst tools used to create: Cross sections Top surfaces Fence diagrams Volumes PROPOSED METHODS HYDROSTRATIGRAPHY COMPONENT Image from Strassberg and others, 2010

December 2012 Import current data into geodatabase January 2013 Create cross sections and assign HGU top elevations to wells Interpolate HGU surfaces from tops February 2013 Build 3D fence diagrams and volumes in Arc Scene March-April 2013 Finalize report and presentation for Symposium CONCLUSION PROJECTED TIMELINE

Adapting a universal system design will: Improve data management Increase efficiency Expand ability to communicate 3D concepts Presentation of results WA Hydrogeology Symposium, April 2013 CONCLUSION ANTICIPATED RESULTS

REFERENCES