Gis assessment of water supply damage from the northridge earthquake

ABSTRACT

The 1994 Northridge earthquake results in the most extensive damage to a US water supply system since the 1906 San Francisco earthquake. Three major transmission systems, which provide over three-quarters of the City of Los Angeles, were disrupted. los Angeles Department od Water and Power (LADWP) and Metropolitan Water District (MWD) trunk lines (nominal pipe diameter >600 mm) were damaged at 74 locations, and the LADWP distribution system required repairs at 1013 locations. The widespread disruption provides a unique opportunity to evaluate the geographic variability of the damage, the most vulnerable pipelines, and the relationship among damage, transient motion, and permanent ground deformation. (AU)