HomeMy WebLinkAbout07.a.2) -(Handout) Wet Weather Operations Report(yQndout) 7 0.2
Item No. 7.a.2)
Wet Weather Operations
Report
Margaret P. Orr, P.E. and Curtis Swanson
January 6, 2011
2010 -2011 Winter
• Off to a wet start
• First major rainfall was November 20 & 21
• Series of big storms in late December
• Rainfall to date is 100 to 135% of "normal'
I r- ,._ CCCSD Collection Sy stem
• No capacity - related overflows
• Pumping stations operated well
• Emergency generators started when local
power failures occurred (Orinda & Moraga)
• Martinez and San Ramon PS switched over
to wet weather pumps
• No landslides
2
Acacia Pumping Stati
■ Serves 119 homes in northern Orinda
. Lightning caused a power surge
• Both pumps failed to start because solid state
relays were affected by the lightning
• Staff set up portable pump to convey flow
• Solid state relays were replaced with mechanical
relays which are resilient to power issues, some
alarms were reprogrammed
• Station now "working like a champ"
Treatment Pl S t a ti s tics
. Flows
• November Peak Hourly 73.3 MGD
• November Daily Average 53.6 MGD
• December Peak Hourly 105.4 MGD
• December Daily Average 69.6 MGD
3
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