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Arc Hydro and Modeling

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Arc Hydro and Modeling. Intrinsic Modeling within a particular application eg Excel, ArcGIS ... Data Model Based on Behavior ... – PowerPoint PPT presentation

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Title: Arc Hydro and Modeling


1
Arc Hydro and Modeling
  • Intrinsic Modeling within a particular
    application eg Excel, ArcGIS
  • Dynamic Linked Library tightly coupled package
    of functions (e.g. LibHydro from HEC)
  • Independent Modeling separate hydrologic model
    with data exchange

2
Streams Drainage Areas Hydrography Channels
Terrain Surfaces Rainfall Response Digital
Orthophotos
Thematic Layers supporting the Arc Hydro data
model (from Michael Zeiler Modeling Our World
Volume 2)
3
Data Model Based on Behavior
Follow a drop of water from where it falls on the
land, to the stream, and all the way to the ocean.
4
Integrating Data Inventory using a Behavioral
Model
Relationships between objects linked by tracing
path of water movement
5
Intrinsic Hydrologic Modeling
  • Dr Tarboton
  • DEM-based hydrologic modeling
  • USGS
  • Stream Stats
  • Mean annual flows and pollutant loads

Streamstats
http//ststdmamrl.er.usgs.gov/streamstats/expert.h
tm
6
Dynamic Linked Library
Can have Fortran subroutines in a DLL
Muskingum flow routing
7
Independent Hydrologic Model
VB progam reads and writes text files
8
Interfaces to Arc Hydro Data and Models
Excel
ArcGIS
Relational Database (Access)
Visual Basic
9
ArcGIS Development at DHI
  • Extend the ArcGIS Hydro Data Model

10
DHI TimeSeries Package
  • TimeSeries Package Architecture

11
Three basic water problems
  • Too little water (Drought and water supply)
  • Too much water (Flooding)
  • Its dirty (Water Quality)

Also have significant GIS effort on environmental
issues related to water such as habitat
assessment
12
1996 Texas Drought
  • George W. Bush, (then Governor of Texas) asked
    Tell me how much water we have, how much water
    were using and how much water we need
  • State water officials did not have adequate
    answers

13
Texas Water Planning
  • 1997 Texas Legislature passed Senate Bill 1 which
    provided for
  • State-wide geospatial data development
    (topography, hydrography, land use, soils and
    orthophotos)
  • Water planning in 14 regions rather than
    state-wide
  • Assessment of water availability for all water
    permits

14
Hydrologic Cataloging Units (HUCS)
Hydrologic Unit Code 12100203
Guadalupe Basin (4 HUCs)
  • 2015 HUCs cover continental US
  • average area 1 county

15
Water Availability in the Guadalupe Basin
Estimate water availability at each legally
permitted water diversion point based on
naturalized flow at stream gages and the
effects of other permitted diversions
16
Digital Elevation Model
San Marcos basin
National Elevation Dataset 30m x 30m
cells 11,000,000 cells to cover San Marcos
basin 70,000,000 cells to cover Guadalupe basin
17
Drainage Area Delineated from the Digital
Elevation Model
Arc Hydro attribute DrainArea
18
Estimating Naturalized Flow at Diversion Points
Naturalized flow record at stream gage (50
years of monthly flows)
Qf
Af
Qd
Estimated flow record at diversion point
Ad
19
Length Downstream
Flow distance (D to F) Length Downstream
(D) Length Downstream (F)
Length Downstream (F)
F
D
D
Seepage losses
F
Length Downstream (D)
Arc Hydro attribute LengthDown
20
Water Availability Modeling
Letter to each water permit owner specifying of
permitted flow available during a drought
Completed for 10,000 water permit holders,
1998-2002
21
Water Availability Assessment (completed for
10,000 permit holders, 1998-2001)
Texas Natural Resources Conservation Commission
Hydrologic modeling by engineering consultants
Letter to each water permit owner specifying of
permitted flow available during a drought
Geospatial data development by Center for
Research in Water Resources, Univ. of Texas
22
Flood Hydrology and Hydraulics
ArcView Input Data DEM
ArcView Flood plain maps
HEC-GeoHMS
Hec-GeoRAS
HEC-RAS Water surface profiles
HEC-HMS Flood discharge
23
Status of the Software
  • HEC-GeoHMS ver 1.0 available from HEC for ArcView
    version 3 http//www.hec.usace.army.mil/software/s
    oftware_distrib/geo-hms4arcview/geohmsprogram.html
  • Arc Hydro terrain and watershed functions replace
    some but not all of HEC-GeoHMS
  • HEC-GeoRAS ver 1.0 http//www.hec.usace.army.mil/s
    oftware/software_distrib/geo-ras4arcview/georaspro
    gram.html
  • ESRI has developed a beta-version of GeoRAS for
    ArcGIS

24
Austin Digital Elevation Model
Waller Creek
25
Austin Watersheds
26
CRWR-PrePro (a precursor of HEC-GeoHMS)
Digital Elevation Model Stream Map
ArcView-based preprocessor for HEC-Hydrologic
Modeling System (HEC-HMS)
Control point locations
Soil and Land Use Maps
HMS Basin File
27
DEM Watersheds for Austin
28
Selected Watersheds and Streams
Mansfield Dam
Colorado River
29
HMS Schematic Prepared with CRWR-PrePro
Mansfield Dam
Colorado River
30
HMS Model of the Austin Region
31
HMS Results
Watershed 155
Junction 44
32
Flood Hydrology and Hydraulics
ArcView Input Data DEM
ArcView Flood plain maps
HEC-GeoHMS
Hec-GeoRAS
HEC-RAS Water surface profiles
HEC-HMS Flood discharge
33
Colorado River Network
1100,000 scale Developed from National
Hydrography Dataset
34
City of Austin Stream Network
Developed from 1100 Capco Areal
photogrammetry 11200 scale
35
Stream Definition Waller Creek
Austin Watersheds with Streamsderived from
Aerial Photographs
Streamlines generated by the aerial photographs
are not always continuous.
36
Information for Correcting Stream Network
  • DEM
  • Contours
  • Storm sewers
  • Orthophotos

37
Resulting Corrected Stream
  • Subsequent steps
  • Verification of corrected streams by flood
    hydrologists.
  • Running tracer program to connect arcs.
  • Burning of streams into DEM.

38
Waller Creek HMS Model
39
Flood Plain Mapping
40
Connecting HMS and RAS
41
Flood Hydrology and Hydraulics
ArcView Input Data DEM
ArcView Flood plain maps
HEC-GeoHMS
Hec-GeoRAS
HEC-RAS Water surface profiles
HEC-HMS Flood discharge
42
HEC-RAS Background
  • River Analysis System model of the U.S. Army
    Corps of Engineers
  • Input cross-section geometry and flow rates
  • Output flood water elevations

Cross-Section Schematic
43
Waller Creek
Watersheds
Network
Channel
44
HEC-RAS Cross-Section Description
  • Points describe channel and floodway geometry
  • Bank station locations
  • Water surface elevations and floodplain
    boundaries

45
Discharge at a Particular Cross-Section
46
HEC-RAS Output
  • Graphical
  • Text File

47
Floodplain Mapping Plan View
48
3D Terrain Modeling Ultimate Goal
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