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Track: Water Distribution, Wastewater, Sewer
Benjamin Sherman
Camp Dresser & McKee, Inc.
One Woodward Avenue Suite 1500
Detroit, MI 48105
Telephone: 313-963-1313
Fax: 313-963-3130
E-mail: SHERMANBJ@cdm.com
Mark TenBrock
Hydrologic Computer Model Parameter Distribution and Correlation Development Using a Geographic Information System
Defining Issue: A computer model for a sewer system that serves nearly 3 million people in a service area over 800 square miles required a consistent, uniform, and readily updatable approach to parameter distribution. Such a large project necessitated the use of GIS tools to achieve the required level of detail in a reasonable expenditure of time. Estimates of system growth also made forecasting of parameters to future years an important issue. Furthermore, large quantities of spatially dependent information required tools to assist in correlation development in a cost-efficient manner. GIS Solution: Camp Dresser & McKee developed sophisticated distribution methods for model parameters and used available tools and data to rapidly develop correlations. Furthermore, the GIS was used to assemble many pertinent statistics regarding the tributary area such as potential future users (those currently on septic systems). Methodology: The fundamental spatial units of the computer model are subsections of
the sewer system tributary area. These subsection areas were delineated and a coverage created consisting of many important subsection attributes. This coverage was related to other coverages such as those containing demographics, land use, construction age, and so forth These relationships were coupled with project-related field data for correlation development and/or distribution of model parameters at the subsection level. With minor modifications, these large data sets were used to estimate changes in parameters for future needs due to anticipated system configuration changes, expansion, and population and employment growth. Software: ArcCAD was used as the primary GIS data handler/processor and to create necessary coverages. ArcView was used for graphical display of data and query results. MS ACCESS was used as the relational database processor to handle complex queries and to assemble coverage attributes from existing databases. Purpose: The purpose of the paper is to highlight this unique
perspective to the computer modeling/GIS association in the form of a case study.
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