Title Advanced Hydraulic Modeling to Support Emergency Action Plans

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1 Title Advanced Hydraulic Modeling to Support Emergency Action Plans Abstract Freese and Nichols, Inc. (FNI) developed an Emergency Action Plan (EAP) for a Levee Improvement District (LID) located in a low-lying topographically challenged coastal community. The purpose of the EAP is to outline the actions that need to be implemented before, during, and after an emergency situation. In order to develop an effective EAP, it is necessary to have a good understanding of how the study area would respond to a situation such as a failure of the levee, failure of pump stations, or severe flooding. The study area is surrounded by a very complex hydraulic system encompassing a large river, large creeks, flood control structures, a couple of channels to divert flood waters, and a levee protecting $4 billion of infrastructure. The internal drainage system of the levee includes multiple canals and two pump stations. The study area is currently modeled with standalone HEC-1/HEC-HMS and HEC-2/HEC- RAS models representing individual components of the system. The results of these models may not take into account the effects of other system components, and may result in unrealistic flows or water surface elevations. In order to better represent the behavior of the hydraulic system, FNI developed a hydraulic model of the entire study area utilizing advanced hydraulic modeling techniques within InfoWorks Integrated Catchment Model (ICM). InfoWorks ICM is a state of the art hydraulic model that allows the user to route flows through different structures such as gates, pump stations, bridges, culverts, channels, etc. It also couples these elements with a two-dimensional (2D) mesh for areas where flowpaths are not clearly defined. The result is a seamless hydraulic model that better represents the interaction of the different flooding sources, drainage elements, control structures, diversions, and possible consequences of a levee breach. Simulations included a system analysis of design events, historic flood scenarios, system response to various storms on different flooding sources, filling related to direct rainfall deposition, breaches at various locations in the levee system, and exterior level of protection from overtopping. Results from each simulation provided detailed flow, depth, travel times, and velocity data useful to understand available time to evacuate residents and allocate resources. The knowledge gained from these results was used to make informed judgments on the Emergency Action Plan based on consistently flooded areas, situational flooding, and high ground good for staging a response. Name of Presenters Hector Olmos, P.E., CFM Jeremy Dixon, E.I.T., CFM Affiliation Freese and Nichols, Inc Town and Country Way Suite 600 Houston, Texas Telephone: (713) heo@freese.com

2 Presenter Bios Hector Olmos is an experienced Project Manager/Engineer and Certified Floodplain Manager. With ten years experience, he is experienced in small - and large-scale hydrologic and hydraulic modeling and his background includes basin-wide drainage master plans, preparation of CLOMRs, LOMRs, sizing of drainage structures for roads, channels and dams, unsteady-flow hydraulic models, dam breach analyses, inundation mapping, PMF development, development of gate operation policies, and calibration of hydrologic and hydraulic models. Jeremy Dixon is a Project Engineer and Certified Floodplain Manager. He has experience in hydrologic and hydraulic analysis ranging from standard modeling to complex 2D hydraulic modeling used for levee breach analysis. He is also proficient in FEMA submittals and has been providing support to Harris County Flood Control District on their LOMR delegation program by reviewing developer submittals.

3 Advanced Hydraulic Modeling to Support Emergency Action Plans HECTOR E. OLMOS, P.E., CFM JEREMY DIXON, E.I.T., CFM

4 PROJECT AREA

5 FLOODING SOURCES

6 ADDITIONAL LEVEES

7 CONTROL STRUCTURES

8 INTERNAL DRAINAGE

9 PROBLEMS WITH EXISTING MODELS Assumed boundary conditions No connectivity No way to account for undefined flow paths Diversion: Flows Assumed in Hydrologic Model Not included in Hydraulic Model

10 REASONS FOR ADVANCED MODELING Client had a number of questions: Are there any existing systemic vulnerabilities? How do these systems interact? What role does timing play in flooding? What would happen if?

11 ADVANTAGES OF ADVANCED MODEL Addresses the problems with the existing models Connectivity between all elements Only one assumed boundary condition 2D flow paths through mesh Ease of understanding output 2D animation replays Time-series data Results points Analyze multiple different scenarios Historic Events System Analysis Pump Station Failure Breach Analysis

12 WHY INFOWORKS ICM? Large 2D area Variable element area mesh Breach analysis capabilities GPU Processing (Simulations are faster)

13 MODEL DEVELOPMENT Hydrologic model developed from: HEC-HMS Models USGS Stream Flows Hydraulic model developed from: HEC2/HEC-RAS Models Plan Sets LIDAR

14 CHALLENGES BUILDING/RUNNING THE MODEL Size of the study area ±5,000 acres Importing geometry from RAS Mass balance (junctions, voids) Meshing Errors Initialization Operating Procedures Scheduling of runs & duration Elevation datum

15 RESULTS

16 ARE THERE ANY SYSTEMIC VULNERABILITIES? Levee has several feet of freeboard for 100-year event Reasonably safe from external events up to 600-year Some internal flooding due to decreasing bank elevations Inundation spreading through streets may prevent vehicular access

17 HOW DO THE SYSTEMS INTERACT?

18 HOW DO THE SYSTEMS INTERACT? Ditch H Inflow Oyster Creek

19 HOW DO THE SYSTEMS INTERACT?

20 WHAT ROLE DOES TIMING PLAY IN EVACUATIONS?

21 STAGING EVACUATION INUNDATION AT 1 HOUR

22 STAGING EVACUATION INUNDATION AT 4 HOURS

23 STAGING EVACUATION INUNDATION AT 8 HOURS

24 WHAT WOULD HAPPEN IF?

25 SUMMARY OF ADVANTAGES OF THIS MODEL Integrate existing models to allow connectivity between systems Informative and easy-to-understand results Scenario management and run scheduling Client now has a modeling framework that can be modified Develop a CIP Channel modification Levee improvements Pump improvements Add storm sewer lines Water quality modeling sediment Stormwater BMPs

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