Las Vegas Valley Water District (LVVWD) utilized a customized version of Optimizer™ to revise operations as system conditions evolved to maintain acceptable water quality by minimizing water age, while also reducing system operating costs.
LVVWD implemented an Energy and Water Quality Management System (EWQMS) using a daily hydraulic model. Having already realized significant reduction in energy costs and improved water quality in its distribution system, LVVWD engaged Optimatics to apply its trademark optimization technologies to determine if additional improvements could be made.
Las Vegas Valley Water District, Las Vegas, Nevada
Water Quality and Operations Optimization
- Customized version of Optimizer for optimization of daily operations
- Minimization of operating costs and water age simultaneously with the weighting of penalties to determine the primary objective
“The DOOT experience successfully demonstrated that the GA optimization applications can be used realistically for water distribution system operations and water quality. I am very impressed by Optimatics’ work and see future opportunities for the realistic optimization of distribution system operations and water quality.”
Mao Fang, PE, PhD
Senior Civil Engineer
Las Vegas Valley Water District
The resulting solution, known as the Daily Operations Optimization Tool or DOOT, was developed to select turnout flows, pump operating schedules and key valve settings, while ensuring design constraints (such as maximum inflows at turnouts) and performance constraints (such as target reservoir levels) are satisfied. The optimization problem could be adjusted to minimize water age as the primary objective (e.g., for winter periods) or minimize system operating costs as the primary objective (e.g., for summer days).
The software was successfully applied to a typical winter demand condition which is considered the worst case scenario for water age. The DOOT results demonstrated a 13% reduction in average water age in the 34 reservoirs throughout the system when compared to a typical LVVWD operating strategy.
The software was also successfully applied to a typical summer day scenario and achieved power and energy cost savings of 9.6% over a 24-hour period when compared to a typical LVVWD operating strategy. This was particularly significant as LVVWD had previously achieved substantial cost savings with its EWQMS efforts.
Minimizing water age for a typical winter period while lowering pumping costs.
Among the key outcomes were that water age operations software was developed for a typical winter demand case, Optimatics utilized its distributed computing version of its OGA software to enhance the speed of the optimization search, and Optimatics later helped the District install a demo version of the OGA running on a network of Planning Department computers.