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<br />. <br /> <br />CONTENTS <br /> <br />Page <br />Foreword. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V <br />Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. B I <br />Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 <br />The flood problem in southern California .......................................... I <br />Flood-control facilities in southern California ....................................... 3 <br />Description of the southern California storms of January 18-26, 1969 . . . . . . . . . . . . . . . . . . . . 5 <br />Description of the southern California floods of January 18-26, 1969 . . . . . . . . . . . . . . . . . . . . 5 <br />Effect of flood-control measures on flood damage. . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . 8 <br />Effect of urban sprawl on flood damage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10 <br />Summary and conclusions ...................................................... 11 <br /> <br />ILLUSTRATIONS <br /> <br />AFrontispiece. Photograph showing floodwater rushing through doorway of home in Mandeville <br />. Canyon, a Los Angeles suburb. <br /> <br />Page <br />Figure 1. Map showing report area ............................................................................................... B2 <br />2-6. Photographs showing: <br />2. Result of mud flow in Glendora, January 22............................................................. 6 <br />3. Result of landslide (mudslide) in Glendora, January 26........................................... 7 <br />4. Street flooding in El Segundo................................................................................... 7 <br />5. Floodwater flowing down Casiano Road in Bel-AiL................................................ 7 <br />6. Inflow and outflow hydrographs of Santa Ana River at <br />Prado flood-control basin .............. ..... ..... ....... ............ ................... ............. ............ 9 <br /> <br />TABLES <br /> <br />Page <br />Table I. Summary of precipitation data at selected stations........................................................ B5 <br />2. Peak discharges at selected stations for the floods <br />of March 1938 and January 1969.................................................................................. 8 <br />3. Estimated physical damage in the report area in March <br />. 1938 and January 1969................................................................................................. 9 <br /> <br />VII <br />