Reservoir 4606-1 Construction (Mission Hills Pressure Zone)

STI/SPFA 2017 Tank of the Year

Product / project title: Reservoir 4606-1 Construction (Mission Hills Pressure Zone)
Product / project owner: Coachella Valley Water District
Product / project location: Coachella Valley, CA
Date completed: Nov 2017
Construction standard (if any): AWWA D100
Overall height / length (feet, inches): 40’ -0”
Column height (feet, inches): –
Diameter (feet, inches): 186’ – 0”
Capacity (US gallons): 6,800,000
Steel tonnage used (US tons): 619
Steel thickness (inches): 0.3125” to 0.9788”
PRODUCT/PROJECT DESCRIPTION AND SPECIAL FEATURES:
This tank was under consideration to be built via concrete or welded but the design team performed a Life cycle cost analysis and overall bid the job as a welded steel tank. It was designed to meet the new demands of an ever growing city as well as supplement future demand of additional housing tracks.  This asset will be a critical part of their system for decades/ centuries to come.
The tank was designed in accordance with AWWA D-100 section 14 in order to be as cost effective as possible; but due to high seismic load’s and the tank being located just feet away from the San Andres Fault line there were many precautions taken in the design/supply of the reservoir.  The tank as a whole weighed more than 1.2 million pounds and was constructed during the Santa Ana winds.  The effects of the high winds were amplified by the fact that it’s located on a mountain range which regularly sees winds in excess of 60 mph on any given day.  Although there were many days which the crew had to work split shifts or submit a weather delay, we were still able to complete the job on time with a satisfied customer and a safe crew.  This was due to the construction sequencing of a welded steel tank and the ability to start / stop as needed in order for the crew to safely follow all applicable safety regulations.

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