THE WATER SUPPLY IN LOS ANGELES.

THE WATER SUPPLY IN LOS ANGELES.

The topographic map of the Calabasas quadrangle, which extends from Santa Monica, Los Angeles county, Cal., west along the coast fifteen miles and as far north as Chatsworth, has recently been issued by the United States Geological Survey. The work done in this quadrangle completes the detailed survey of the drainage basin of the Los Angeles river, from which the present domestic water supply of the city of Los Angeles is derived. As a result of the survey, several facts of marked economic importance arc shown. A number of streams, including the Malibu and the Topanga, drain the precipitous face of the coast range and empty into the Pacific ocean. The coast in this vicinity is abrupt and inhospitable, and the water supply from these drainage basins is not utilised, but is lost in the sea. These streams are among the very few in Southern California that are not used to any material extent in connection with irrigation development. The topographic survey develops three important facts concerning these streams: First, that their drainage areas are of material dimensions; second, that reservoir sites of large capacity exist on their drainage lines; and, third, that it is possible to divert waters from these reservoir sites by a gravity canal line along the south face of the coast range to the fertile foot-hill lands lying between Santa Monica and Hollywood, in the suburbs of the city of Los Angeles, and even to supply, by gravity, a considerable portion of the city of Los Angeles with domestic water.

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