Water System at San Diego.
On July 31, 1901, the city of Sail Diego, Cal., acquired by purchase the ownership of the system of waterworks within the corporate limits of the city. From August 1, 1901, to August 13, 1906, the source of supply was from the sands and gravel of Mission Valley, in and near the channel of San Diego river. A series of wells, 3 to 7 inches in diameter and from 25 to 40 feet deep, constituted the plant. A small amount of water was also pltrehased from the San Diego Flume Company. Their supply proved inadequate, however, and frequently unfit for drinking purposes In 1906 the California Mountain Water Company completed its sup ply system, and on August 13, of the same year, entered into a ten-year contract with the city to supply all the water required by the city up to the maximum amount of 7.776.000 gallonin one day of twenty-four hours Since that date the city has been adequately supplied with pure water and the substantial and continuous growth of the city can be directly attributed to the excellence of its water and abundant supply.
Under the system of pumping water from Mis sion Valley by the city, consumers were re quired to pay twenty cents per one thousand gallons. The Southern California Mountain Water Company agreeing to furnish all the water the city needed at four cents per thousand gallons enabled the department to reduce the cost to consumers to approximately ten cents per one thousand gallons. The supply is of the pun mountain variety. Before passing into the city’s reservoirs, on University Heights, it is filtered through one of the most modern filtration plants, located on Chollas Heights. The system of mechanical filtration in use insures the removal of iff per cent, of the bacteria and all microscopic organisms, odor, color and offensive matter held in suspension. It is one of the most modern purification systems known to science, combining sedimentation, filtration and aeration. By its use pure, sparkling water is always assured. The filter automatically deans itself every twenty-four hours According to the annual aeport for 1910, the increase in the receipts of the department for the year 1910, from water amounted to $2l.935,32, from installation if meterand connections made, $5.076,25, from service renewals. $124.05, or total increase over the receipts of 1909 of $27,135.62. The amount of water purchased from the Southern California Mountain W ater Company was 1.653,920,000 gallons, an increase of 242,540,000 gallons over the quantity purchased in 1909.
The average daily distribution of water was 4,531.000 gallons, a per capita of 117.27, on a basis of 40.000 population. The amount of water furnished by meter measurement and flat rate was approximately 1.550,031 gallons; deduct ing this amount from the total amount purchased we have 103,337,443 gallons, which is the approximate amount of water furnished fur street sprinkling, sewer Hushing and other city uses, being an increase in daily per capita of 1.94 gallons. One hundred and nine fire hydrants of the California Iron Works pattern were placed and fifty-two old pattern one and two way hydrants removed, making a total number in use December 31. 1910, 023 The city laid during the past year 49,522 feet of east-iron pipe and 93,054 feet of two-inch and less for mains, making a total of 142,576 or twenty-seven miles of pipes laid. The greater portion of the pipes laid were for extensions and services and were laid by the regular construction force of the department. There were 41,322 feet of eastiron pipe and 0,120 feet of two-inch wroughtiron pipe removed during the year, and 3,264 feet of old kalamcined and other pipe abandoned. The construction of two elevated steel tower tanks was commenced early in the year. One of 490,000 gallons capacity on University Heights adjacent to the old reservoir, and one of 440.000 gallons capacity near the upper Point Loma reservoir. These tanks were practically completed on December 31, 1910; the final coats of paint were being applied, this completed, nothing remains hut final acceptance. The elevation of the steel tank on University Heights is sufficient to give ample pressure for all needs in that section of the city lying east of the University Heights reservoirs. heretofore insufficiently provided with water. The tank on Point l.oma will provide sufficient water and good pressure for the resident section of the city on Point l.oma Heights. All the water used by the city is purchased under a ten year contract with the Southern California Mountain Water Company, which expires May 1. 1916, and stipulates the price to he paid by the city: the city agreeing to purchase all water supplied through its works during the full ten-year period, “up to the maximum amount of 7.776,000 gallons of water in one day of twenty-four hours, should so much he required,” the company is required to provide and maintain sufficient storage, so that there shall be on hand March 31, each year, at least two years’ supply at this rate in excess of that to he furnished by the company to other consumers; and the company is required to maintain its works so as to be capable of delivering at till times any quantity up to the maximum specified for any period of twentyfour hours. The company is required to keep the city’s reservoir at University Heights and its mvn reservoir at Chollas Heights, tilled at all times, and in the event of there being less than two years’ supply stored in the Otay reservoir in the spring of any year, to provide for such supply by the diversion or the storage of the water of the Cottonwood river or other streams. The Southern California Mountain Water Com pane, has. since it entered into contract with the city for supplying its water, added to its chain of impounding reservoirs, several reset voirs of immense capacity The Morena reservoir. located some sixty miles from the city, at an elevation of 3,209 feet, is rapidly nearing completion, and will have, when completed, a capacity of 15,000,000,000 gallons, and the Bar rett reservoir, located ten miles below the Morena, will, when completed, have the same capacity; and with the impounding reservoirs completed to date, San Diego will have an adequate water supply for a city ten times its present size The average daily consumption for the past year was 4,529.779 gallons. The meter rate for all consumers is eight cents per 100 cubic feet, and minimum rate $1 per month for the first 1,250 cubic feet or less Including seventy lire services, there are 8879 consumers of city water, and 1,633 meters in use.