Cobb County Water System – Pinetree-KSU Outfall Sewer Upgrade

The Cobb County Water System has selected ESI to provide the design and engineering of approximately 6,000 feet of a sanitary outfall sewer. This outfall sewer will replace an existing line that is aged and undersized. Included in the scope of services is field survey and data collection, route selection, preparation of preliminary and detailed designs, easement plat preparations, investigation of wetlands and environmental and cultural resources, preparation of permit applications, preparation of bid documents, and bid assistance. Work on this project is expected to begin in 2016.

Water Loss Control

With respect to water loss control and improving water supply efficiency, ESI, in association with Smart Water Analytics (SWA) has just been selected by GEFA to develop pilot pressure management evaluations and District Metering Areas (DMAs) for four water systems in Georgia. SWA is the lead firm of the GEFA project team which also includes international expert Julian Thornton, who was the Chairman of the sub-committee involved in preparation of the AWWA M36 Manual for Water Audits and Loss Control Programs. This experience will be helpful in assisting our clients to comply with the rules for public water systems to improve water supply efficiency.

Bahamas Water and Sewerage Corporation

ESI, in association with Smart Water Analytics (SWA), developed hydraulic models in WaterCAD® for 14 different water supply projects. The models were set up for 2035 water demands and prepared to run on Extended Period Simulations (EPS) for a minimum of 48 hours. The models were used to set the baseline conditions for new projects in the planning stage. The modelling runs included:

Energy Efficiency Assessment ‐ Using the hydraulic model, evaluated existing pumping alternatives to select the most efficient pumping system available to obtain the best‐fit balance of optimum hydraulic and energy efficiency.

Evaluation of Disinfection Systems – Analyzed disinfection efficiency by simulating water age and residual chlorine concentration for each project.

Analysis of Reliability and Redundancy of the Water Distribution System ‐ Used the hydraulic and water quality model to evaluate several scenarios regarding the vulnerability of the water system to:

• Extreme peak demands for the service areas

• Breakage of critical water mains

• Loss of power supply for pumps included in the project

• Mechanical pump failures at pumping stations

• Failure of disinfection system at the treatment plants

• Providing water storage and fuel storage for backup power for emergency situations

• Placing the facilities at locations to reduce potential climate change impacts