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10 Job No. 2669.01 Water Systems Alternative Energy Feasibility Study
<br />SECTION 6:
<br />POTENTIAL FOR HEAD RECOVERY AT MWD CONNECTIONS
<br />6.1 METROPOLITAN WATER DISTRICT CONNECTIONS
<br />The Santa Ana water system has seven connection points with the Metropolitan Water District, SA -1 through SA -
<br />7. Each station contains a pressure reduction controller to convert from MWD pressure to city water pressure.
<br />MWD pressure typically ranges from 160 to 190 psig, per logs of plant operation. City water is typically
<br />controlled at 63 to 75 psig. There are one to three pressure reducing valves at each station to regulate pressure,
<br />sized for different flow rates. Flow at a station is typically manually set at a given rate for weeks or months at a
<br />time, counting on the booster pumps to automatically cycle or change speed, to fine tune pressure in the
<br />distribution system. A number of these pumps operate with Variable Frequency Drive controls to more closely
<br />match the loads.
<br />The flow through each of these connection points is shown in the following table, derived from the city's
<br />Monthly Production Reports. This is monthly data for calendar year 2017 and is taken to be representative of
<br />flows in typical years.
<br />Cubic Feet
<br />Jan -17
<br />SA -1 SA
<br />400
<br />-2 SA -3
<br />- 500
<br />SA -4 5A-5
<br />-
<br />SA76
<br />- 2,410,100
<br />SA -7
<br />2,402,400
<br />Tota I
<br />4,813,400
<br />Feb -17
<br />4,511,700
<br />- 2,399,600
<br />-
<br />- 13,949,500
<br />8,302,400
<br />29,163,200
<br />Mar -17
<br />5,350,500
<br />- 5,739,400
<br />-
<br />- 16,551,800
<br />-
<br />27,641,700
<br />Apr -17
<br />19,539,100
<br />- 6,567,100
<br />-
<br />- 25,336,200
<br />3,395,800
<br />54,838,200
<br />May -17
<br />20,903,300
<br />- 9,248,200
<br />-
<br />- 21,477,600
<br />-
<br />51,629,100
<br />Jun -17
<br />14,247,700
<br />- 9,197,300
<br />-
<br />- 21,670,300
<br />4,672,800
<br />49,788,100
<br />Jul -17
<br />21,471,100
<br />- 10,073,800
<br />-
<br />- 21,487,200
<br />-
<br />53,032,100
<br />Aug -17
<br />21,467,200
<br />- 7,686,100
<br />8,629,900
<br />- 26,616,400
<br />-
<br />64,399,600
<br />Sep -17
<br />20,771,300
<br />- 9,723,300
<br />16,652,200
<br />- 31,517,800
<br />143,900
<br />78,808,500
<br />Oct -17
<br />21,131,000
<br />- 17,444,100
<br />11,249,200
<br />- 32,394,700
<br />308,300
<br />82,527,300
<br />Nov -17
<br />20,539,500
<br />- 19,375,700
<br />-
<br />- 20,765,900
<br />-
<br />60,681,100
<br />Dec -17
<br />21,451,800
<br />- 19,702,700
<br />-
<br />- 21,367,300
<br />-
<br />62,521,800
<br />2017 Cubic
<br />Feet per Year
<br />191,384,600
<br />- 117,157,800
<br />36,531,300
<br />- 255,544,800
<br />19,225,600
<br />619,844,100
<br />Total water delivered by MWD peaks in the fall months and is close to zero during January. Note that some
<br />interconnection points were not used at all in 2017, and some were used minimally. (SA -5 was out of service,
<br />per the 2017 Water Master Plan.)
<br />The following table shows the Normal Operating Capacity for each MWD connection, as listed in the 2017 Water
<br />Masterplan, and its equivalent in CFS.
<br />CITY OF SANTA ANA 19H-18 Newcomb I Anderson I McCormick
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