MWH Soft Dramatically Reduces Time Required to Design and Operate Unidirectional Flushing Programs

Posted: Thursday 3rd December 2009

New Version 6.0 of InfoWater UDF Adds New Features to Help Save Utilities Time and Money.

MWH Soft has announced the release of version 6.0 of its industry-leading InfoWater UDF software. The new release, which utilizes both the MWH Soft InfoWater and ESRI (Redlands, CA) ArcGIS technology, provides substantial updates based directly on client feedback and real-world implementation of unidirectional flushing programs. It also further substantiates MWH Soft’s continued commitment to providing water utilities with the most complete set of hydraulic modeling and management tools possible.

Unidirectional flushing (UDF) is the most effective way of cleaning water mains and maintaining water quality and system capacity. It also requires the least amount of water of any cleaning method. In this approach, valves are closed and hydrants opened to create a one-way flow. This high-speed flushing increases the swiftness of the water flow in the mains, maximizing shear velocity near the pipe wall. This produces a scouring action that effectively removes sediment deposits and biofilm.

UDF can help improve water quality by restoring the disinfectant residual, reducing bacterial regrowth, dislodging biofilms, removing sediments and deposits, controlling corrosion, restoring flows and pressures, eliminating taste and odor problems, and reducing disinfectant demand throughout the distribution system. These benefits can also prolong the life expectancy of the system and reduce the potential for waterborne disease outbreaks.

Unique in its class, MWH Soft InfoWater UDF capitalizes on the intelligence and versatility of the GIS geodatabase architecture in combination with advanced network hydraulic theory. Its advanced capabilities can help water utilities develop effective unidirectional flushing sequences for each flushing zone, quickly identifying which fire hydrants and water main valves should be manipulated for proper cleaning while avoiding excessive pressure drops and maintaining the desired level of hydraulic performance in the system.

The program also computes minimum flushing time, total flushing volume and pipe length, flushing velocity and shear stress for every pipe in the sequence, and available flow at the minimum residual pressure. The hydraulic impact of each flushing sequence is monitored to ensure that the desired minimum pressure is maintained throughout the system. InfoWater UDF also generates detailed reports of flushing sequences showing which fire hydrants and water main valves should be manipulated to assure optimal cleaning. Both minimum velocity and minimum shear stress criteria can be specified.

Major enhancements in InfoWater UDF v6.0 include:

“The new version of InfoWater UDF is focused on dramatically reducing the design time needed to create a unidirectional flushing program,” said MWH Soft Vice President—Director of Americas Operations, J. Erick Heath, P.E. “The updates also give the utility unprecedented flexibility to make modifications to their sequences on the fly as field data changes. These enhancements help put the design of a unidirectional flushing program within reach for virtually any water utility.”

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