A blueprint of a map designed to show water table levels within the San Fernando Valley. Sixteen wells were examined with depths between 818 feet (central valley) and 404 feet (at the narrows). Rancho El Escorpion (Canoga Park) on the west, Verdugo wash and City of Los Angeles on the east and south, Sylmar area on the north. Area of Hollywood and Beverly Hills noted as "Cahuenga Valley." Routes of Pacoima and Tujunga Washes reinforces Los Angeles City claim to water underlying the San Fernando Valley. "L. Friel, C. E." Relief: hachures. Projection: Plane. Printing Process: Blueprint copy. Verso Text: MS notes: San Fernando Valley 446663.
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