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Enough water for 151,000 people?

Manteca projection assumes SSJID can protect water rights

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Enough water for 151,000 people?

Three different water wells are tied into the arsenic treatment plant on Moffat Boulevard.

HIME ROMERO/The Bulletin

POSTED July 24, 2013 2:38 a.m.

Manteca’s water supplies could support a population of 151,000.

That, however, comes with an asterisk.

Public Works Director Mark Houghton noted as long as South San Joaquin Irrigation District is able to protect its water rights, the city will have enough water from the second phase of the surface water treatment plant expansion and seven additional wells to serve another 25,000 homes or 80,000 more residents. Manteca’s population as of Jan. 1 was 71,164.

A status report on Manteca’s long range water supplies was presented recently to the City Council.

Manteca currently has 16 water wells and is entitled to up to 11,500 acre feet of water annually from the Nick DeGroot South County Surface Water Testament Plant located just west of Woodward Reservoir. An acre foot is the equivalent of 325,900 gallons. The Department of Water Resources indicated a typical family of four living in a home with landscaping consumes 174,000 gallons of water a year.

Manteca has contractually secured another 7,000 acre feet of water a year when the treatment plant expands. Houghton stressed that is assuming the water rights that SSJID has aren’t compromised by the ripple effect of protecting the Delta if the Twin Tunnels are put in place. Based on that water and an additional seven to eight wells Houghton projects a 75 percent increase in the water supply that will support the development of 25,000 more homes.

Just as important, according to Houghton, is the city’s ability to meet peak demand. Manteca currently uses 4.835 billion of gallons a year at an annual average use of 9,200 gallons per minute. The maximum consumption for one day is 16,000 gallons per minute. But during peak hors the consumption rate is much higher. The highest peak hour in 2012 saw 26,000 gallons per minute being used.

That is why Manteca is adding a water tank on the northeast corner of Woodward Avenue and Atherton Drive in  Southeast Manteca that will have the ability to hold as much as 3.5 million gallons.

A 3.5-million gallon tank represents 2.3 million flushes of low flow toilets or 233,000 five-minute showers using low-flow showerheads. It is also the equivalent of 153.5 swimming pools that are 16 by 32 feet with 8.5 feet in the deep end and 3 feet in the shallow end.

By comparison, the 51-year-old water tower that no longer passes state-mandated seismic standard located on Wetmore Street near Main Street was designed to hold 300,000 gallons. That water tower is scheduled for demolition within the next year.

The water towers in Ripon that are visible on a clear day by motorists on Interstate 580 descending the Altamont Pass can hold 2.5 million gallons of water each or 200,000 gallons less than the proposed Atherton Drive water tank.

Manteca also plans to eventually build another storage tank near the intersection of Lathrop and Austin roads.

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