Arc Hydro Hydronetwork Drainage systems Channels Time Series Modeling Hydrologic integration. Arc Hydro: GIS for Water Resources. David R. Maidment, University of Texas at Austin. The Arc Hydro data model and application tools are in the public domain.
Arc Hydro design took 3 years from 1999 - 2002
CRWRGIS in Water Resources Consortium
Arc Hydro Data Model
Follow a drop of water from where it falls on the land, to the stream, and all the way to the ocean.
objects linked by tracing path
of water movement
National Elevation Dataset
National Hydrography Dataset
Elevation Derivatives for
National Application (EDNA)
Watershed Boundary Dataset
Flowlines through water body
(for topological connection of edges)
Basins – drainage areas for water
Watersheds – subdivision of Basin
for a particular hydrologic purpose
Catchments – subdivision of Basin into elementary drainage areas by physical rules
Digital Elevation Model –
land surface terrain grid cells
Study area only 1.4 km!
1/2 meter Digital Ortho Photography
The electronic depth sounder operates in a similar way to radar It sends out an electronic pulse which echoes back from the bed. The echo is timed electronically and transposed into a reading of the depth of water.
GPS gives the location of each point collected in terms of latitude and longitude. Two locations for differential GPS.
Each point has (x,y,z)
Points are interpolated in ArcMap to produce a continuous surface.
Define the centerline along the thalweg of the channel
Measures are assigned in meters
A PolylineM can store m-values at each vertex along with x and y coordinates.
m is measure along the centerline
r is distance across the river from the centerline
Sinuous river becomes straight when transformed into (m,r) co-ordinates.
Profile line and cross-sections
Profile lines and cross-sections in (x,y) created using FishNet in (m,r).
Original river in X,Y
Bird’s eye view!
Arc Hydro NWIS data
Web access to USGS
water resources data
Arc Hydro Time Series Table
Data from 14 radars calibrated with 435 rain gages
At end of month more careful calibration is done for historical rain map archiveNexrad Data for Florida
Average area = 14.5 km2
in a DLL
VB progam reads and writes
Interfaces to Arc Hydro Data and Models
Arc Hydro tools and data model are on CD at back of
Arc Hydro book and available on web at