Flooding tendencies for the city of Ensenada, Baja, California, Mexico, 1948-2004

Abstract

Precipitation data collected from 4 stations located in the city of Ensenada, Baja California Mexico from 1948 to 2004 were analyzed and associated with damaging floods. Precipitation values from 1948 to 1977 did not exceed 35mm. in 24 hours; however, rainfall daily reports of 51, 52 and 81mm. were found in 1978, 1979 and 1980, respectively, exceeding the 50mm. of water/day capacity of the sewage system for the city causing considerable infrastructure damage and even the loss of lives. No values greater than 46mm have been observed from 1981 to 2004 yet landslides have been frequently observed in areas with steep slopes and alluvial material in some parts of the city. Floodplain occupancy, lack of maintenance of drainage systems as well as inundations in low land areas, account for the main flooding problems for the city. A map is developed in this study showing the different flooding zones associated with the amount of precipitation for the city. Remedial options are offered for city planners. © 2009 WIT Press.