GIS for Faster Analysis of Dam-Break Flows .


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GIS for Faster Analysis of Dam-Break Flows. Steve Pitman GIS in Water Resources – Fall 2003 Dr. David Maidment – UT Austin. The Problem:. A breached dam releases large volumes of water very rapidly Can’t predict dam-break floods using observations of natural floods
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GIS for Faster Analysis of Dam-Break Flows Steve Pitman GIS in Water Resources – Fall 2003 Dr. David Maidment – UT Austin

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The Problem: A ruptured dam discharges substantial volumes of water quickly Can\'t foresee dam-break surges utilizing perceptions of normal surges Existing dam-break models Complex, precarious and tedious Not helpful for fast examination

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Approx. 77,000 aggregate Consider a most dire outcome imaginable: On the Colorado River, Glen Canyon Dam and Hoover Dam, 370 miles separated, made Lake Powell and Lake Mead with joined stockpiling equivalent to about four times the stream\'s yearly stream . Dams in the U.S. USBR Photo What might this water do if quickly discharged? Lake Powell USBR Photo

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Teton Dam, Idaho – June 5, 1976 Teton Dam, Idaho – present day

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GIS in Dam-Break Analysis Today Pacific Disaster Center utilizes the M2M interface to deciphers FLDWAV yield for showcase in ArcGIS NWS creating FLDWAV-GIS join for showing surge forecasts PBS&J (FEMA Contractor) has handled a Watershed Analyst expansion that computerizes pre-and post-preparing of watershed displaying information

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FLDWAV Input: Dam parameters Valley geometry Flood Routing Finite-distinction arrangement of element wave conditions Output: Flow rates & profundities at chose areas Estimate rupture attributes Geometry Formation time Outflow Hydrograph Current Dam-Break Models DWOPER & DAMBRK created by National Weather Service (NWS) in 1970\'s NWS discharged FLDWAV in 1990\'s Combined DWOPER & DAMBRK Added usefulness

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GIS Geospatial information Time Series information Geodatabase Adding Automation with GIS Interface Data Model Pre-Processing Post-Processing

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Example USGS – The National Map

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Resources Applied Hydrology , Chow et al, McGraw Hill (1988) U.S. Topographical Survey sites U.S. Agency of Reclamation sites National Inventory of Dams, U.S. Armed force Corps of Engineers Arc Hydro , Maidment, ESRI Press (2002) Source of photographs

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