federal emergency management agency automated hydrology and hydraulics john liou fema region viii

FEDERAL EMERGENCY MANAGEMENT AGENCYFEDERAL EMERGENCY MANAGEMENT AGENCY

AUTOMATED HYDROLOGY AND AUTOMATED HYDROLOGY AND HYDRAULICSHYDRAULICS

John LiouJohn Liou

FEMA Region VIIIFEMA Region VIII


Automated H&H Automated H&H RequirementsRequirements

• Existing, advanced Geographic Information Existing, advanced Geographic Information System (GIS)System (GIS)

• Recent aerial surveys in digital formatRecent aerial surveys in digital format

• Good digital land use informationGood digital land use information

• Fairly clear watershed boundariesFairly clear watershed boundaries

• Major restudy needsMajor restudy needs


Advantages of Automated Advantages of Automated H&HH&H

• Economies of scale realized with large Economies of scale realized with large drainage basinsdrainage basins

• Enhanced ability to perform “what-if” Enhanced ability to perform “what-if” scenariosscenarios

• Easily integrates with GIS forEasily integrates with GIS forhouse-by-house flood zone warnings, house-by-house flood zone warnings, targeted buyouts, or other planstargeted buyouts, or other plans


Advantages of Automated Advantages of Automated H&H (Continued)H&H (Continued)

• More readily integrates with FEMA digital More readily integrates with FEMA digital mapping standardsmapping standards

• May ultimately lead to real-time forecastingMay ultimately lead to real-time forecasting


Disadvantages of Automated Disadvantages of Automated H&HH&H

• Quality of topographic input data and land use Quality of topographic input data and land use datadata

• Integration of field-surveyed cross sections with Integration of field-surveyed cross sections with DEM data DEM data

• Time required for pre-processing and mappingTime required for pre-processing and mapping

• Layer controlLayer control

• ExpenseExpense


Automated HydrologyAutomated Hydrology

• GIS allows for automatic determination of GIS allows for automatic determination of watershed characteristics needed in modelingwatershed characteristics needed in modeling

• Land and channel slopes, surface flow Land and channel slopes, surface flow connectivity, and watershed boundaries can connectivity, and watershed boundaries can be determined from DEM, DTM, or TIN databe determined from DEM, DTM, or TIN data

• Land use or soil characteristics can be Land use or soil characteristics can be determined from other GIS-based datadetermined from other GIS-based data

Overview of Automated H&H Overview of Automated H&H

Hydrologic Modeling

Hydraulic Modeling

Floodplain Mapping

Input data: Cross sections

“n” values

Input data: DEMs, Soils

Streams Land use

Automated HydrologyAutomated Hydrology


Frequently Used Automated Frequently Used Automated Hydrology ProgramsHydrology Programs

• HEC Pre-Pro, University of TX (HEC-HMS)HEC Pre-Pro, University of TX (HEC-HMS)• BASINS, Environmental Protection Agency BASINS, Environmental Protection Agency

(HSPF)(HSPF)• GIS Hydro, University of MD (TR-20, USGS GIS Hydro, University of MD (TR-20, USGS

Regr.)Regr.)• WMS, Brigham Young University (TR-20, HEC-WMS, Brigham Young University (TR-20, HEC-

HMS, HEC-1, TR-55, Rational Method, USGS HMS, HEC-1, TR-55, Rational Method, USGS Regr.)Regr.)

• MMS, USGS (PRMS)MMS, USGS (PRMS)

Automated H&HAutomated H&H

Watershed Modeling System (WMS) Watershed Modeling System (WMS) picture courtesy of BOSS International.picture courtesy of BOSS International.

Used by permission.Used by permission.


Available Automated Available Automated H&H PackagesH&H Packages

• Watershed Modeling System (WMS)Watershed Modeling System (WMS)

• River Modeling System (RMS)River Modeling System (RMS)

• RiverCADRiverCAD

• Arc-SWMMArc-SWMM

• MIKE11 GISMIKE11 GIS

• HEC GeoHMSHEC GeoHMS

• GIS WeaselGIS Weasel


Available Automated Available Automated H&H PackagesH&H Packages

• Watershed Information System (WISE)Watershed Information System (WISE)

• Surface Water Modeling System (SMS)Surface Water Modeling System (SMS)

• HydroCADHydroCAD

• PC SWMMPC SWMM

• RiverToolsRiverTools

• BASINSBASINS

• HEC-RAS/12DHEC-RAS/12D


Online Information on Online Information on Automated H&H Automated H&H

• FEMA Flood Hazard Mapping Web Site FEMA Flood Hazard Mapping Web Site –http://www.fema.gov/mit/tsd/mm_ahh1.htmhttp://www.fema.gov/mit/tsd/mm_ahh1.htm

• BOSS International WMS Web SiteBOSS International WMS Web Site–http://www.bossintl.com/html/wms_overview.htmlhttp://www.bossintl.com/html/wms_overview.html

• BOSS International RMS Web SiteBOSS International RMS Web Site–http://www.bossintl.com/html/rms_overview.htmlhttp://www.bossintl.com/html/rms_overview.html

Note: This does not constitute an endorsement of any Note: This does not constitute an endorsement of any specific product by FEMA.specific product by FEMA.


Automated Floodplain Automated Floodplain MappingMapping

• Applies automated H&H model resultsApplies automated H&H model results

• Automates floodplain delineationsAutomates floodplain delineations

• Provides for rapid map updatingProvides for rapid map updating

• Georeferences floodplain boundaries and Georeferences floodplain boundaries and model parametersmodel parameters

federal emergency management agency automated hydrology and hydraulics john liou fema region viii

Documents

automated hydrology

gisbased data slide

needs slide

usgs prms slide

soils streams land use

tin data land use

realtime forecasting

modeling land