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Map-Based Flood Hydrology and Hydraulics. David R. Maidment Jan 10, 1998. Map-Based Hydrology and Hydraulics. Connecting ArcView with HMS for the Austin Region Flood simulation using Nexrad data in Houston HMS-RAS for Waller Creek in Austin Creating flood plain maps in Waller Creek.

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map based flood hydrology and hydraulics

Map-Based Flood Hydrology and Hydraulics

David R. Maidment

Jan 10, 1998

map based hydrology and hydraulics
Map-Based Hydrology and Hydraulics
  • Connecting ArcView with HMS for the Austin Region
  • Flood simulation using Nexrad data in Houston
  • HMS-RAS for Waller Creek in Austin
  • Creating flood plain maps in Waller Creek
map based hydrology and hydraulics3
Map-Based Hydrology and Hydraulics

ArcView

Input Data

DEM

ArcView

Flood

plain maps

CRWR-PrePro

HEC-RAS

Water

surface

profiles

HEC-HMS

Flood

discharge

crwr prepro
CRWR-PrePro

Digital Elevation Model

Stream Map

ArcView-based preprocessor

for HEC-Hydrologic Modeling

System (HEC-HMS)

Control point locations

HMS Basin File

presentation outline
Presentation Outline
  • Using GIS to connect hydrology and meteorology
  • Representation of spatial objects in GIS
  • Terrain analysis using Digital Elevation Models
  • Geodesy and map projections
study region in west austin
Study Region in West Austin

Hog Pen Ck

4 km

4 km

watershed delineation by hand digitizing
Watershed Delineation by Hand Digitizing

Watershed divide

Outlet

Drainage direction

dem elevations
DEM Elevations

720

720

Contours

740

720

700

680

740

720

700

680

dem elevations12
DEM Elevations

Contours

700

680

slide13

32

64

128

16

1

8

4

2

Eight Direction Pour Point Model

slide14

67

56

49

53

44

37

58

55

22

Direction of Steepest Descent

1

1

67

56

49

53

44

37

58

55

22

Slope:

slide15

2

2

4

4

8

1

2

4

8

4

128

1

2

4

8

2

1

4

4

4

1

1

1

2

16

Flow Direction Grid

austin west 30 meter dem elevations in meters ftp ftp tnris state tx us tnris dema html
Austin West 30 Meter DEMElevations in meters ftp://ftp.tnris.state.tx.us/tnris/demA.html
slide19

Flow Accumulation Grid

0

0

0

0

0

0

0

0

0

0

0

3

2

2

0

3

2

0

0

2

0

0

1

0

0

11

0

1

0

11

0

0

0

1

15

0

0

1

0

15

1

0

2

5

24

2

5

0

1

24

Link to Grid calculator

slide20

0

0

0

0

0

0

3

2

2

0

0

1

0

0

11

0

0

0

1

15

1

0

2

5

24

Flow Accumulation > 5 Cell Threshold

watershed and drainage paths delineated from 30m dem
Watershed andDrainage PathsDelineated from 30m DEM

Automated method is more consistent than hand delineation

dem data sources for texas
DEM Data Sources for Texas
  • Digital terrain models with 2’ or 4’ contours built from aerial photogrammetry
  • 10m DE-DEMs, from 1:24,000 scale maps with drainage enforcement (experimental)
  • 30m DEMs from 1:24,000 scale maps
  • 1” seamless DEM of Texas (March, 1999)
  • 3" (100m) DEMs from 1:250,000 scale maps (current state-wide coverage)
selected watersheds and streams
Selected Watersheds and Streams

Mansfield Dam

Colorado

River

hms schematic prepared with crwr prepro
HMS Schematic Prepared with CRWR-PrePro

Mansfield Dam

Colorado

River

hms basin file
HMS Basin File

Basin file is a text

description of all

hydrologic elements

155

33

87

Subbasin

39

Reach

Junction

hms results
HMS Results

Watershed 155

Junction 44

map based hydrology and hydraulics37
Map-Based Hydrology and Hydraulics
  • Connecting ArcView with HMS for the Austin Region
  • Flood simulation using Nexrad data in Houston
  • HMS-RAS for Waller Creek in Austin
  • Creating flood plain maps in Waller Creek
map based hydrology and hydraulics43
Map-Based Hydrology and Hydraulics
  • Connecting ArcView with HMS for the Austin Region
  • Flood simulation using Nexrad data in Houston
  • HMS-RAS for Waller Creek in Austin
  • Creating flood plain maps in Waller Creek
map based hydrology and hydraulics50
Map-Based Hydrology and Hydraulics
  • Connecting ArcView with HMS for the Austin Region
  • Flood simulation using Nexrad data in Houston
  • HMS-RAS for Waller Creek in Austin
  • Creating flood plain maps in Waller Creek
hec ras background
HEC-RAS: Background
  • Hydraulic model of the U.S. Army Corps of Engineers
  • Input = cross-section geometry and flow rates
  • Output = flood water elevations

Cross-Section Schematic

hec ras cross section description
HEC-RAS: Cross-Section Description
  • Points describe channel and floodway geometry
  • Bank station locations
  • Water surface elevations and floodplain boundaries
hec ras output
HEC-RAS: Output

Graphical

Text File

hec ras data translation
HEC-RAS: Data Translation
  • Data translation from HEC-RAS text file to dbase table
  • Bank and floodplain boundaries measured from stream centerline
digital stream mapping
Digital Stream Mapping
  • Digital orthophotograph and road coverage used as a base map
  • User digitizes stream with mouse
  • Boundary points define the RAS stream
slide58

Web Links

For more information about GIS and Hydrology, seehttp://www.ce.utexas.edu/prof/maidmentTo obtain CRWR-PrePro to link ArcView with HEC-HMS, seehttp://www.ce.utexas.edu/prof/olivera/prepro/prepro.htmTo take an online spatial hydrology course, seehttp://campus.esri.com/campus/home/home.cfm