Freese and Nichols completed an update to the 2007 Water Distribution System Master Plan for the City of Arlington, which serves more than 378,000 people.
Freese and Nichols used the H2OMAP Water modeling software to fully integrate the City’s GIS system. The all-pipes model utilized the City’s existing GIS and had a unique alphanumeric ID created for each asset to maintain a one-to-one relationship for future updates.
Freese and Nichols conducted field pressure testing in the water distribution system under summer-demand conditions at 24 locations throughout the City in four pressure planes for two weeks. The calibration was completed using operational controls over a 24-hour period that were also used for the future planning models. Freese and Nichols also conducted pump testing at each pumping facility to evaluate actual pumping capacities as compared to the original factory curve.
Existing land use by parcel was identified by matching it to the City’s billing database and existing land use file. Future population and commercial/industrial projections were developed using the City’s Future Land Use Plan and densities by Census Block from the 2010 Census. All of the population and demand data is stored in an Access database by parcel that will allow the City to quickly analyze changes in population or demand assumptions, and can be joined with other GIS databases to show information graphically.
All of the future system modeling was performed with EPS under winter-day, average-day and maximum-day demand conditions for the 5-year, 10-year and build-out planning periods.