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<br />Sa71 Marcos Floodplain Management Plan: A Sustainable Future for Floodplain Management <br />Application for Flood Protection Study Grant <br /> <br />following is a list of the more damaging storm events that have been documented in the San <br />Marcos area. <br /> <br />· October 18 to 20. 1909: The maximum recorded rainfall was 10 inches in San <br />Marcos in Hays-Caldwell County. Deaths and damages unknown. Reference: US <br />Army Corps of Engineers, unpublished data. <br /> <br />. December 1-6. 1913: Flooding resulted in 177 deaths, and losses exceeded $8.5 <br />million. Storm Centers: Hays Co., San Marcos 18.80 inches, Travis County, Austin <br />14.07 inches, Williamson Co., Leander 13.78 inches. Reference: Ellsworth,1923. <br /> <br />. May 14-15. 1970: Heavy rains began in the Sink, Limekiln and Willow Springs <br />watersheds near San Marcos near 6:00PM May 14, 1970. By 3:00PM May 15, <br />rainfall would range from 6.0 inches at the Sink and Purgatory Creek headwaters to <br />18.0 inches at radio station KCNY in downtown San Marcos. <br /> <br />Two children drowned and about 400 homes and many businesses and public <br />buildings flooded in the San Marcos area. Three elementary schools were flooded, <br />and students from one were rescued from the roof by helicopter. The Aquarena <br />Springs Administrative Building had 6 ft of water in it. The National Guard was de- <br />activated as their facilities flooded. Hundreds of cars were destroyed as tens of feet <br />of turbulent flow covered city streets. 18.00 inches of precipitation was reported in <br />downtown San Marcos. Reference: John Patton, National Weather Service, written <br />communication, 1999. <br /> <br />· Mav 11-12. 1972: 16 inches of rain fell in the San MarcoslNew Braunfels area in <br />Hays and Caldwell Counties during a 4-hour period. 17 lives were lost to the <br />rampaging floodwaters that inundated 400 homes and caused about $17.5 million in <br />damages. Reference: Co/wick and others, 1972. <br /> <br />· October 17, 1998: 15 inches of rain fell in a 24-hour period causing substantial <br />damage to university and municipal property. Rising water damaged 6 major <br />facilities at Southwest Texas State University. Water levels in Strahan Coliseum <br />crested at 5 11 feet. Residents in the Clear Springs apartment complex had to be <br />evacuated after two buildings received 8 feet of water and another approximately 8 <br />inches. Reference: Slade and Persky, 1999. <br /> <br />· June 30 - Julv 18. 2002: The main part of the storm event (June 29-July 6) was <br />concentrated in Kendall County and surrounding counties. The heaviest rainfall <br />occurred between early morning and noon of June 30th. Rainfall intensities of 3 <br />inches per hour were common. A volunteer weather observer in Waring. Texas <br />recorded 14.05 inches of rainfall during a seven-hour period on the morning of June <br />30th, and 45.41 inches total during the seven-day period. The National Weather <br />Service recorded total depths ranging from 12.27 inches at Ingram No.2 to 31.88 <br />inches at Bankersmith during that period. Reference: John Rael, PE, US Army Corps <br />of Engineers, 2002. <br /> <br />M:\activeI04P012 San Marcos M.D.P\Grant Applic-8Ma.dlxhitJIt A, Page 13 <br /> <br />December 16, 2004 <br />