Laserfiche WebLink
CDBG-MIT Acti®n Plan <br />City of San ars , TX <br />According to the NOAA Storm Events Database, there were eight (8) documented flood events <br />listed for the City of San Marcos and 69 documented events listed for Hays County from year <br />1997. While NOAA Storm Events Database lists events since 1997 for the County, events were <br />not documented perjurisdiction until 2004. The flood events reported for the City of San Marcos <br />are shown in Table 7. <br />Table 7 Flood Events, City of San Marcos <br />Location <br />San Marcos <br />Date <br />11/14/2004 <br />Type <br />Flash Flood <br />San Marcos <br />9/8/2010 <br />Flash Flood <br />San Marcos <br />5/13/2014 <br />Flash Flood <br />San Marcos <br />5/27/2014 <br />Flash Flood <br />San Marcos Lowman AR <br />5/30/2015 <br />Flash Flood <br />San Marcos <br />6/28/2015 <br />Flash Flood <br />San Marcos <br />5/19/2016 <br />Flash Flood <br />San Marcos <br />9/26/2016 <br />Flash Flood <br />Source: City of San Marcos Hazard Mitigation Plan <br />According to NOAA Storm Events Database, in October of 2013 (Disaster 4159 -DR), a surface <br />trough was the focus of trailing storms which produced heavy rainfall that led to major flooding <br />across the Onion Creek and Blanco/San Marcos River watersheds. Thunderstorms produced <br />heavy rain that led to flash flooding in Wimberley, San Marcos, Buda, and Kyle. Public reports <br />stated that 14 inches of rain fell near Wimberley and this rainfall made its way into the Blanco <br />River and Onion Creek Watersheds. The Blanco River flooded and major flooding occurred <br />downstream to San Marcos. The Blanco River crested at 26.74 feet in Wimberley. Flooding <br />then occurred in the San Marcos River as the flood wave crossed IH -35 in San Marcos. <br />Sections of San Marcos flooded near the Blanco River, including areas of Texas State <br />University and areas along River Road, where several evacuations of residences occurred. The <br />Blanco River was 100 feet out of its banks. In many areas along the Blanco River, debris was <br />found 15 to 20 feet off the ground. <br />In May of 2015 (Disaster 4223 -DR), a historic flash flood occurred on the Blanco River. <br />Hundreds of homes were destroyed along the river from the City of Blanco down into <br />Wimberley and San Marcos. The flood wave continued downstream for days, affecting <br />residents and homes along the San Marcos and Guadalupe Rivers. Thunderstorms produced <br />more heavy rain that caused flash flooding. Downstream from the bridge, the Blanco River <br />reached a record crest. The gage failed at 40 feet and the USGS later estimated the crest at <br />44.9 feet. This height was more than 10 feet over the previous record height of 33.3 feet from <br />1929. Homes along the banks of the Blanco River down to San Marcos experienced a historic <br />flood. Many homes were totally destroyed and swept downstream. Other homes were struck <br />by large debris, including full-sized cypress trees that typically lined the banks of the river. The <br />river experienced rises that exceeded 20 feet within 1 hour. <br />In October of 2015 (Disaster 4245 -DR), a warm front combined with an upper level trough and <br />deep moisture produced heavy rainfall and severe thunderstorms across much of South - <br />14 <br />