20251031 18424000 1.0 TRUE DPW.Final_85th_Percentile_Isohyet Rainfall gages throughout the County were selected based on spatial distribution and rainfall record length to determine the 85thpercentile, 24-hour rainfall. The 85thpercentile, 24-hour rainfall can be used to determine the stormwater quality design volume per DPW’s Low Impact Design Manual. Martin Araiza County of Los Angeles Department of Public Works Water Resources Division 900 S. Fremont Ave Alhambra, CA 91803 maraiza@dpw.lacounty.gov 626-458-6152