The Alliance for Water Efficiency (AWE) and ...
Through better water measurement, California water company discovers it was overestimating water loss by 18%
In 2008, after experiencing two years of drought and the driest spring in recorded history, water reserves in California were desperately low.
Carmel Riviera, which serves up to 600 residents living along California’s Big Sur Coast, made the choice to upgrade to high-performance flow measurement instrumentation to understand exactly where water was going.
“This was an important step to drive water conservation by understanding our water-loss percentage, improving production efficiency and water quality by reducing backflush, and more accurately identifying over users,” said Wayne Daniel, head of operations.
Like most independent water companies, Carmel Riviera contracts the operation of its production facilities to a third-party expert. Carmel Riviera draws water from eight operational wells and the nearby Mal Paso Creek and has long relied on the expertise of Carmel Lahaina Utility Services Inc. of Carmel Valley, Calif., to assure that their drinking water is always clean and available.
With its ozonation system, using ozone as an oxidant in the treatment process, SCADA operating system, Carmel Riviera Mutual Water Co. is on the cutting edge of water treatment for an independent, grade 2 water company.
The company had always suspected that non-revenue water-loss in the distribution system could be up to 100,000 gal per month. It decided it was time to finally discover how much water was really missing. For years, the company relied on water readings taken from antiquated, worn-out mechanical paddle-wheel flowmeters.
Through better water measurement, the company discovered it was overestimating its water loss by 18%. As a result, it significantly reduced the annual $60,000 maintenance and operations budget, shifting excess funding to improve conservation and efficiency to generate more water to sell to customers.
The company estimated its annual water loss rate through leaks, waste, evaporation and other losses at around 30% of the total produced. The company budgeted almost $60,000 per year in initiatives to reduce these leaks, including labor and materials for surveys and expensive repairs.
After six months of using the flowmeter, the company found their actual loss rate to be only 12% of production. The improved production and usage figures derived from the flowmeter enabled the company to significantly reduce its annual maintenance and operations budget to target more funding on improving conservation and efficiency.
Scott Rouse is product line director for Sierra Instruments. Rouse can be reached at [email protected] or 831.373.0200.