Bexar County Flood Warning System. Curtis Beitel, PE, CFM, Anthony Henry and Wayne Tschirhart, PE, PMP
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1 Bexar County Flood Warning System Curtis Beitel, PE, CFM, Anthony Henry and Wayne Tschirhart, PE, PMP
2 Software Overview 2 Processes Hydrometric DB Event Manager Automatic Low = Every 6 hours High = Every 15 minutes 24/7 Runs InfoWorks RS InfoWorks CS InfoWorks SD Source: FloodWorks Version 13.0 Users Manual, Innovyze, July 2012 Bexar County Flood Warning System May
3 Future Rainfall System Overview NEXRAD 15 min from NWS Rain Gages Level Gages SAOEM EOC NWS Hydrometric Database Western Configuration FloodWorks Server at SARA office Website Central Configuration XML Website Parser Eastern Configuration SARA Web Server Bexar County Flood Warning System May
4 Warning Locations Selected by SAOEM based on historic operations Upper San Antonio River 46 locations Leon Creek 30 locations Medina River 20 locations Cibolo Creek 13 locations Salado Creek update 14 pilot + 19 new locations Total of 142 locations Upper San Antonio River Scoping Map Bexar County Flood Warning System May
5 RS model available (at 74 locations) Elevation / Depth Flow Velocity Location Map Inundation Map No RS Model (at 68 locations) Flow only Location Map Warning Locations Bexar County Flood Warning System May
6 Hydrology 2 Processes Probability Distributed Model Simplified Runoff Model Probability Distributed Model Estimates soil moisture from gaging station Simplified Runoff Model Uses soil moisture to generate runoff hydrographs at ungaged locations Runoff Rainfall and Potential Evaporation Probability Distributed Model (PDM) Routing Reaches (Olmos Watershed) Soil Moisture Simplified Runoff Model (SRM) Runoff RS Hydraulic Model (SAR Watersheds) Rainfall Bexar County Flood Warning System May
7 Hydrology - PDM Calibration Developed by CEH Wallingford Requires real time gaging station Estimates soil moisture Rainfall Evaporation Direct Runoff Surface Runoff Probability Distributed Soil Moisture Storage Surface Storage Recharge Groundwater Storage Baseflow Total Stream Flow Upper San Antonio River Gages Bexar County Flood Warning System May
8 1/1/1998 7/2/1998 1/1/1999 7/2/1999 1/1/2000 7/1/ /31/2000 7/1/ /31/2001 7/1/ /31/2002 7/1/ /31/2003 6/30/ /30/2004 6/30/ /30/2005 6/30/ /30/2006 6/30/ /30/2007 6/29/ /29/2008 6/29/ /29/2009 6/29/ /29/2010 6/29/ /29/2011 6/28/ /28/2012 Daily Mean Discharge (cfs) Hydrology PDM Calibration 18,000 16,000 14,000 USGS Discharge Data SAR Lower SAR Upper Olmos Calibration Event 12,000 10,000 8,000 6,000 4,000 2,000 0 Date Bexar County Flood Warning System May
9 Discharge (cfs) Rainfall Rate (in/hr) Hydrology PDM Calibration 9, ,000 7,000 6,000 Observed Flow (cfs) Computed Flow (cfs) Rainfall Rate (in/hr) ,000 4,000 3,000 2, , Date / Time Olmos Creek at Dresden Drive - September 2010 Event Bexar County Flood Warning System May
10 Discharge (cfs) Rainfall Rate (in/hr) Hydrology PDM Calibration 16, ,000 12,000 Observed Flow (cfs) Computed Flow (cfs) Rainfall Rate (in/hr) , , ,000 4,000 2, Date / Time San Antonio River at Mitchell Street - September 2010 Event Bexar County Flood Warning System May
11 Discharge (cfs) Rainfall Rate (in/hr) Hydrology PDM Calibration 70, ,000 50,000 Observed Flow (cfs) Computed Flow (cfs) Rainfall Rate (in/hr) , , , , Date / Time San Antonio River at Loop September 2010 Event Bexar County Flood Warning System May
12 Hydrology - Simplified Runoff Model Generates runoff hydrographs for each basin Basin average rainfall Effective rainfall Based on soil moisture deficit Converts to runoff Q Q input into InfoWorks RS At a point Distributed over reach Upper San Antonio River Subbasins Bexar County Flood Warning System May
13 Hydraulics - Overview Upper San Antonio River 72 miles Leon Creek 66 miles Medina River 19 miles Cibolo Creek 0 miles Salado Creek 24 miles Total = 181 miles Upper San Antonio River Main RS Bexar County Flood Warning System May
14 Hydraulics Development DFIRM RAS models As detailed as possible Steady peak flow rate Focused on 100-year 1D flow Hydrologic routing English units InfoWorks RS models Match RAS within 0.5 feet Unsteady, Full range of flows Balanced focus (low & high) 1D with multiple flow paths Dynamic channel routing Metric units Bexar County Flood Warning System May
15 Hydraulics - Development Simplified RS models Run within 15 minute window Starts with DFIRM RAS Review / refinement Delete unnecessary sections Import into RS Steady RS (low flows) Unsteady RS (HMS hydrographs) Add structures 1 at a time Compare RAS vs. RS Optimization Bexar County Flood Warning System May
16 Hydraulics - Capabilites Complex split flow areas Martinez Creek Bexar County Flood Warning System May
17 Hydraulics - Capabilities Apache Creek Undersized storm drains 10-year flow in storm drain Rest of 100-year overland Bexar County Flood Warning System May
18 Hydraulics - Capabilities Concepcion Creek 100-year flow is completely contained in a large box culvert system Bexar County Flood Warning System May
19 Hydraulics - Capabilities Flow through neighborhoods Apache Creek Concepcion Creek Series of storage areas in InfoWorks RS Bexar County Flood Warning System May
20 Hydraulics - Capabilities Flood Control Tunnel Operations San Pedro Creek Tunnel San Antonio River Tunnel Bexar County Flood Warning System May
21 Warning Thresholds Established for each location At least 1.0 foot between threshold elevations Stage-discharge rating curve at locations without RS models Bexar County Flood Warning System May
22 Warning Thresholds - Elevations At locations with RS model Used DFIRM RAS models at each location Depth = Elevation Datum (flowline) Detailed spreadsheets to document Bexar County Flood Warning System May
23 Warning Thresholds - Flows Only flows at locations without RS models Stage-discharge rating curve to relate flow and elevation Detailed analysis for San Antonio and Leon Creek watersheds Upper San Antonio River: 100 year - Routing Location Number Location Name HEC-RAS MODEL Threshold Elevation Threshold Discharge Watch Minor Major Watch Minor Major SAN012 D/S of N McCullough Ave & Barbara Dr Tributary A to Airport Tributary SAN044 Babcock Rd & Northill Dr Alazan Unamed Tributary SAN011 N McCullough Ave & Jackson Keller Rd Olmos Creek Lower SAN006 Avondale Ave & Hillje St State Hospital Creek SAN015 West Ave & Jackson-Keller Rd Olmos Creek Lower SAN039 Senisa Dr & Seeling Blvd Alazan Unamed Tributary SAN043 Overdale Pl & Laddie Pl East Woodlawn Ditch SAN007 School St & Monroe St Rockwood_Creek_LimDetail SAN014 Cornwall Dr & Thames Dr Tributary A to Airport Tributary SAN010 Rosemary Ave & N New Braunfels Ave BroadwayDrain_Detailed SAN009 Barilla Pl & Broadway St BroadwayDrain_Detailed Point in O Poor RS to Bexar County Flood Warning System May
24 Warning Thresholds Dam Safety Value added for dam safety in Martinez-B watershed Discharge thresholds Based on SARA design rating curves for pool elevations Q Outflow at Q Outflow at Q Outflow at Aux Spillway 3 feet < Top of Dam Top of Dam Watch Minor Major Martinez 1 Martinez 2 Martinez 3 Martinez 4 Martinez 5 Martinez 6a Rehab 65 2,066 8, , , ,359 10, ,624 14, ,181 51, Bexar County Flood Warning System May
25 Future Rainfall Quantitative Precipitation Forecasts 1 hour to 5 days GIS-based spatial/volume input Forecast information from NWS/NOAA Private sector Wanted to use NWS QPF product 2 total for May 25, 2013 event Actual total = 10 on San Pedro Creek Established flexible procedure with NWS Utilizes NWS WFO s judgment Applied USGS SIR Bexar County Flood Warning System May
26 SAOEM call with NWS WFO in New Braunfels NWS meteorologist discusses storm type, total rainfall and timing SAOEM requests SARA to add Library of profiles in FloodWorks from USGS SIR Future Rainfall Bexar County Flood Warning System May
27 Widespread Future Rainfall - General 6, 12 and 24 hour profiles 6 Hour Distribution Source: USGS Scientific Investigations Report Hour Distribution Bexar County Flood Warning System May
28 Future Rainfall - Convective Thunderstorm Most in 1 st quarter 3, 6, 12 and 24 hour profiles 3 Hour Distribution Source: USGS Scientific Investigations Report Hour Distribution Bexar County Flood Warning System May
29 Future Rainfall - Tropical Landfalling tropical systems Wide variety of historic profiles 1 st, 2 nd, 3 rd and 4 th quartile 24 hour profiles 1 st Quartile Distribution Source: USGS Scientific Investigations Report nd Quartile Distribution Bexar County Flood Warning System May
30 Future Rainfall - Tropical Landfalling tropical systems Wide variety of historic profiles 1 st, 2 nd, 3 rd and 4 th quartile 24 hour profiles 3 rd Quartile Distribution Source: USGS Scientific Investigations Report th Quartile Distribution Bexar County Flood Warning System May
31 Interactive Website at EOC Bexar County Flood Warning System May
32 Details at Warning Location Local web design firm Updated SAOEM site Current and concise data SAOEM EOC SAFD Dispatch Swift Water Rescue SAPD/Sheriff evacuations Bexar County Flood Warning System May
33 Location Maps Bexar County Flood Warning System May
34 Real Time Inundation Mapping Available at RS locations Maximum inundation in 48 hour window Road closures Evacuation limits Water Velocity Water Depth Overall Maximum Bexar County Flood Warning System May
35 Future Rainfall System Summary NEXRAD 15 min from NWS Rain Gages Level Gages SAOEM EOC NWS Hydrometric Database Western Configuration FloodWorks Server at SARA office Website Central Configuration XML Website Parser Eastern Configuration SARA Web Server Bexar County Flood Warning System May
36 BCFWS Operations Rainfall event is forecast SARA switches FloodWorks from 6 hours to 15 minutes SAOEM call with NWS WFO in New Braunfels NWS discusses type, total rainfall and timing SAOEM requests SARA to add for Western, Central, Eastern SARA adds from library of profiles in FloodWorks Provides 1 to 5 hours of lead time (NWS call & travel timing) Western Central Eastern Bexar County Flood Warning System May
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