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We Deliver

Discover exciting data such as how much rainfall we’ve had in the last weeks, how much water we have in storage, and how our customers are using our water, wastewater and power services. The data is in graph form but we’ll explain what each graph means so that you’ll want to return to follow our tracks!

Graph 1: Precipitation at Hetch Hetchy

A new water year (WY) starts every October. The graph charts cumulative precipitation at Hetch Hetchy Reservoir as the WY progresses. Precipitation is shown as a percentage of average, and curves for the current year and past year are shown. Cumulative precipitation curves for both dry and wet years are also shown, as well as a median. Why 1977? – It is the driest year on record. Why 1983? – It is the wettest year on record.

Graph 2: System Storage

An acre foot is the volume of one acre of surface area (150 by 290 feet, 10 feet shorter than a football field) to a depth of one foot, also equal to approximately 325,851 gallons. On average, 1 acre foot of water is enough to meet the demands of 4 people for a year.

“Up country” storage includes Hetch Hetchy, Cherry (Lloyd) and Eleanor reservoirs. “Local storage” includes Crystal Springs, Calaveras, San Antonio, San Andreas, and Pilarcitos Reservoirs.

Graph 3: Regional Water System Meter Deliveries - Total Service Area and San Francisco

We provide water to 2.5 million customers in the greater Bay Area. "San Francisco Customers" include water metered at the San Francisco County Line which serves customers in the City and County of San Francisco. Our total service area includes wholesale customers in the Peninsula, South Bay and East Bay communities. Fun fact: The USGS says that a swimming pool holding 1M gallons of water would be 267 feet long, 50 feet wide and 10 feet deep. CY=calendar year

Graph 4: Wastewater Enterprise Pumped and Treated Flows

What is meant by “wastewater pumped and treated flows”? Each non-rainy day more than 80 million gallons of wastewater is collected and transported to treatment plants, where harmful pollutants like human waste, oil and other pesticides are removed before reaching the San Francisco Bay and Pacific Ocean. Spikes in the graph are the result of rainy days during the year. Because San Francisco has a combined sewer system, we collect and treat both wastewater and stormwater in the same network of pipes. That means the rain that runs off your roofs and streets gets treated at our plants just like the wastewater that goes down your drain.

Graph 5: Solar Photovoltaic (PV) Generation and Metered Cogeneration

Solar Photovoltaic (PV) technology uses semiconductors to convert solar radiation into DC Electricity. Cogeneration is the process of capturing and using the by-products of electrical generation or wastewater treatment facilities. In the case of wastewater treatment facilities, cogeneration systems use the anaerobic digester gas to generate electricity. Rather than directly releasing these by-products back into the environment, they can be used to generate electricity for the facility. MW=megawatts

PV installations include: Sunset Reservoir, San Francisco International Airport, City Distribution Division Offices, Moscone Convention Center, North Point Treatment Plant, Maxine Hall Neighborhood Medical Center, Southeast Water Pollution Control Plant (SEP), Chinatown Public Library, and Pier 96.

Graph 6: Hydro Generation and Municipal Load

Municipal load is the amount of energy needed to power our municipal facilities. On average that is about 120 MW. These facilities include the San Francisco Municipal Railway, SF General Hospital, SF Unified School District, SFO, SFPD, SFFD, the Port of SF and the SFPUC’s regional and local water and wastewater systems. Hydropower is produced at Kirkwood, Moccasin and Holm powerhouses.

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Last updated: 8/20/2013 2:04:02 PM