COMPARING
DSS-WISE-LITE TO OTHER DAM
BREACH SOFTWARE
National Dam Safety Program Technical Seminar No. 22 Dam Breach Modeling and Consequence Assessment
National Emergency Training Center February 18-19, 2015 – Emmitsburg, MD
Brian Shane Cook, PE, LSIT
formerly – Engineering Supervisor – KY Division of Water - Dam Safety currently – Assistant Dam Safety Engineer - North Carolina - Land Quality
Project Background
History
Purpose of Study
Key Considerations
Criteria for Comparison
Testing the FEMA
and DHS/USACE toolboxes
GeoDam-BREACH
DSAT (DSS-WISE-Lite)
Results & Conclusions
Final Results of Study
Lessons Learned
The history, purpose, key considerations, and criteria for comparison of our project
FEMA Hazard Mitigation Grant Rapid Inundation Mapping
180 models using Geo-Dam-BREACH
Enhanced Inundation Mapping
7 models using HEC-RAS 1D
2 models using FLO-2D
Questionable Inundation Results:
Low Head dams
Dams in areas of flat topography
Dams that are small in size
FEMA’s development of GeoDam-Breach
DHS and USACE’s development of DSAT (DSS-WISE-Lite)
Questions about models and their intended use Which models should be used in what situations?
Pilot study
Compare several software packages
Some you may have used BOSS DAMBRK (1-D)
HEC-RAS 4.1 (1-D, unsteady-state)
FLO-2D (2-D)
… and some that are newly released/being released GeoDamBreach (1-D)
DSS-WISE-Lite (2-D)
HEC-RAS 4.2 Alpha (1-D unsteady-state)
HEC-RAS 5.0 Beta (2-D unsteady-state)
Help to inform dam safety community as to key issues/considerations in selection of models
In assessing dam breach software, what
questions are we trying to answer?
How much time/money is involved?
Is the accuracy of the model acceptable?
Can the software produce the end products I
need?
Which models can be used to produce an
Emergency Action Plan?
Which models are appropriate for hazard
classification?
Investment
Software licensing fees
DSS-WISE-Lite is free
Time to setup and run model
DSS-WISE-Lite can be setup in and ran in minutes
Accuracy
Compare results
Water Surface Elevation or Depth of flooding
Inundation area or boundary
Arrival times
Model Limitations
End products
Output data
DSS-WISE-Lite shape files are available to download in minutes to a few hours
Additional shape files can be uploaded into DSS-WISE-Lite
Supplementary tools
DSAT provides additional tools such as population at risk from LandScan dataset, view critical infrastructure, economic consequence assessment model, etc.
GeoDam-BREACH and DSS-WISE-Lite
TESTING THE FEMA AND
DHS/USACE TOOLBOXES
DSAT (DSS-WISE)
DSS-WISE = “The Decision Support
System for Water Infrastructural Security”
Funded by DHS and USACE,
developed by the NCCHE at Ole Miss
Web-based platform, DSS-WISE-Lite operates within DSAT (Dams Sector Analysis Tool) Viewer
Uses 2-d computational engine (CCHE2D-FLOOD)
Input:
Automatically pulls data from National Inventory of Dams based on ID of dam or user input
Input:
Types of dam failures
Total and Sudden dam failure
Partial dam failure
Types of Partial Dam Failures
Embankment (overtopping or piping)
Concrete
Spillway Gate failure
Typical breach parameters are provided (based on type of failure)
User can input breach parameters
Output:
Output data files are downloaded from Server
Shape file of depths of flooding
Shape file of total extent of flooding
Shape file of arrival times of flooding
Summary report
Shape files can be opened in DSAT or
imported into ArcGIS, GeoDam-BREACH, etc.
Assessing Accuracy
and Lessons Learned
KY 0043 – BEECH CREEK DAM
67 feet tall 400 feet wide Area at Normal Pool – 36.3 acres Volume at Normal Pool– 935.5 ac-ft Area at Crest– 46.5 acres Volume at Crest – 1600 ac-ftKY 0043 BEECH CREEK DAM COMPARISON: HEC-RAS 1D, HEC-RAS 2D, & DSS-WISE Legend HEC-RAS 1D DSS-WISE HEC-RAS 2D Value High : 27.04 Low : 0
KY 0103 – WILLISBURG LAKE DAM
77 feet tall 820 feet wide Area at Normal Pool – 126.1 acres Volume at Normal Pool– 2351.5 ac-ft Area at Crest– 244.2 acres Volume at Crest – 7591.1 ac-ftGAME FARM KY 0372 COMPARISON: DSS-WISE, GEO-DAM-BREACH SMPDBK, FLO-2D
KY 0155 - CAMPBELLSVILLE RESERVOIR DAM
49 feet tall 1070 feet wide Area at Normal Pool – 63 acres Volume at Normal Pool– 950 ac-ft Area at Crest– 84 acres Volume at Crest – 1300 ac-ft Low-head “run of river” dam
Simulated in:
SMPDBK
DSS-WISE-Lite
WHITESBURG KY 0075 COMPARISON: GEO-DAM-BREACH SMPDBK AND DSS-WISE-LITE
Lake s p ills o u t o n to ve r y f l a t to p o g r a p hy ( O h i o R i ve r f l o o d p la in ) O r i g i n al l y a t te m p te d i n B O S S - DA M B R K R a n u s i n g G e o d a m -B R E AC H D e t a i l e d m o d e l d o n e i n F LO - 2 D R a n u s i n g D S S - W I S E - L i te
KY 0012 - SCENIC LAKE
Insert Topography overlayed on aerial photography here to illustrate flat-nature of floodplain
SCENIC LAKE KY 0012 COMPARISON: DSS-WISE-LITE, GEO-DAM-BREACH SMPDBK, FLO-2D
KY 0307 – BIG BONE LICK STATE PARK DAM
65 feet tall 750 feet wide Area at Normal Pool – 8.9 acres Volume at Normal Pool– 185 ac-ft Area at Crest– 10.32 acres Volume at Crest – 213 ac-ftKY 1003 – SOUTH FORK BEARGRASS CREEK DAM
56 feet tall 560 feet wide Area at Normal Pool – 40 acres Volume at Normal Pool– 605 ac-ft Area at Crest– 76 acres Volume at Crest – 1462 ac-ftKY 0040 – GUIST CREEK DAM
60 feet tall 1010 feet wide Area at Normal Pool – 317 acres Volume at Normal Pool– 4832.5 ac-ft Area at Crest– ? acres Volume at Crest – 15,405.1 ac-ft Model limitations
DSS-WISE-Lite – Terrain data is limited to National Elevation Dataset
Breach width limited to minimum of 66 feet can effect results
NID data needs to be verified when running models (don’t rely on accuracy of data because it may have been entered wrong
originally when inputted into the NID or corrupt databases could have been used when uploading data into the NID)
Transferring data from one model to another (interoperability)
Import of hydrographs not currently available in DSS-WISE-Lite
Hard to make comparisons if input data can’t be compared
Export of cross section, WSEL, and/or depth grid data
DSS-WISE-Lite is limited to shape files of output Creation of end products
EAP are currently unavailable
Top 3 parameters for differences in models
Breach Parameters
Opinion of inputs varies by user
Hydrograph
Physical model output
HEC-HMS output
HEC-RAS inline structure output
DSS-WISE-Lite doesn’t allow for the input of a breach hydrograph
Terrain data
10 meter to 3 meter DEM from National Elevation Dataset (depends on location in the US)
5 feet LIDAR (Kentucky GIS dataset) was used in modeling project
Or other terrain data that you may have access to
Volume of Reservoir
If the actual volume differs from the volume calculated from the terrain data then the model may not run and an error message will be sent to you by email from DSS-WISE-Lite during the error check validation
Elevations
If known elevations vary from the terrain data then the model may not run and an error message will be sent to you by email from DSS-WISE-Lite during the error check validation
GIS can be a helpful tool to look at terrain data to verify elevations and volumes but not readily accessible by all users.
Bridges
If the bridges are in the National Bridge Inventory or you know the
location and size, then they can be removed when running DSS-WISE-Lite but there will be some differences in the output of the model since rating curves of bridges are not inputted into model
In the instances where there are culverts or bridges at road crossings that are not removed when running DSS-WISE-Lite, the model could show a backwater effect
If I were cutting trim for my house, which is the “right” tool ?