Greenville Plans to Satisfy Future Water Demands

Hazen and Sawyer to Build Hydraulic Model of System, Identify Problem Areas

A Detailed Hydraulic Water System Model

(GREENSBORO, NC – April 16, 2010) – Looking to satisfy water demands for the next twenty years, the Greenville Utilities Commission (GUC) in Greenville, NC, has selected Hazen and Sawyer to develop a comprehensive Water Distribution System Master Plan. The scope includes evaluating modeling software and building a new hydraulic model for planning capital improvements and studying methods of improving water quality.

The new hydraulic model will include every pipe in the distribution system, all existing pumps and tanks, interconnections with surrounding systems, and interface with the utility’s GIS. Demands will be allocated to model nodes using geo-coded customer billing records. Hazen and Sawyer field engineers will ensure the existing system is accurately represented by conducting field measurements – including C-factor tests, pump tests, hydraulic gradient tests and fire flow tests –to calibrate the model. Calibration also will include comparing predicted tank water levels with SCADA records.

The model will map water age to identify water quality problem areas. Hazen and Sawyer modelers will investigate methods of reducing water age, such as changing pump controls, increasing turnover in tanks, bleeding water across zone boundaries, and installing automatic flushers. The project includes identifying water quality emergency response zones so that contamination can be isolated quickly, before the entire distribution system is affected.

Hazen and Sawyer will also develop demand projections for various growth scenarios based on historical trends and planning information in the utility’s GIS. Storage capacity and pump capacity will be evaluated in light of the demand projections.

Hazen and Sawyer has previously completed several design and construction projects for the Greenville Utilities Commission.

Since our founding in 1951, Hazen and Sawyer has focused on two things: providing safe drinking water and controlling water pollution. Our range of services encompasses the planning, design, and construction management of water and wastewater-related projects – from clean water treatment, storage, and distribution to wastewater and stormwater collection, treatment, and reuse.

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