Flood Forecast Mapping in AHPS October 28, 2003

Flood Forecast Mapping in AHPS

October 28, 2003

10/28/2003 MARFC/NWS/NOAA

Outline• Definition• Requirements• Processing Tasks

– One-time– Routine

• Test Area• Presentation Methods• What next?


Definition

• Provide areal extent of flooding referenced against well-understood markings (streets, structures, landmarks) for water elevation forecasts

• At multiple locations along river reach


Requirements

• Water Surface Profile– FLDWAV, SHRT, other

• DEM Data

• Processing Tools

• Presentation Methods


Requirements

• Water surface profile– NWS FLDWAV

• Data collection• Calibration• Verification• Routine generation

– deterministic– probabilistic


Requirements

• Digital Elevation Data– High-resolution most effective

• Reference Overlays– Orthophoto (geo-referenced images)– USGS Quad Sheets– TIGER Data– Utility Plans


Requirements

• Processing Tools– Process static data

• Create ground grid

– Process dynamic data• Create water surface grid

• FLDVIEW– Arcview based


Test Area


Processing – Ground Grid


Processing – Water Surface Grid


Samples (Jan ‘96)


Samples (Jan ‘96 Zoom)


Highwater Comparison (‘84)


Samples (4 layer zoom)


Presentation

• Water surface profile

• Water surface grid– Shapefile

• Static web images

• Web-based image generation

• Policy issues for new product category


Web-based Image Generation

• Internet map service

• User interaction– User selectable layers– Zoom

• Prototype site:– http://nwshqfld.nws.noaa.gov– Autodesk plug-in required


Prototype Map Service


Status

• Single location– Lewistown on Juniata River

• Daily Background processing– After routine operations– Cron initiated– FLDWAV on Linux– FLDVIEW on HP WS


Stats

• Space Requirements– On AWIPS, Lewistown - ~1 GB– On FLDIMS - ???

• FLDWAV performance - Linux– Deterministic, entire Susq. – few seconds– Probabilistic, 7 day PQPF – 35+ seconds– Probabilistic, 30 day - ~ 3 minutes


Stats (cont’d)

• FLDVIEW performance – HP WS– Fully automated– 7+ minutes deterministic (one layer)– 35+ minutes, 5 layer probabilistic (5 layers)

• FLDVIEW performance – P3, 1 GHz, 512 MB– ~1’ 10” per layer


Stats (cont’d)

• Automated process– Within Linux scripts

• OFS, PQPF, ESPADP, FLDVIEW, FTP

– MARFC-developed queuing system – MARFC-developed auto-X-Display– Expect-based FTP transfer of modified

shapefiles


What next?• Sequencing

– From peak value to 6 hour values– Animation?

• New location– Coding and structure changes– Other Susq. FLDWAV calibrated reach

• OHD prepared– Resources and methodology for entirely new

location• Data, software, code, training, documentation• In-house vs. AHPS funded


What next? (cont’d)• Simplified Hydraulic Routing Technique

(SHRT)– Mapping for locations without backwater, without

junctions• NWS Policy

– Products• Water surface profiles, shapefiles, images, internet

mapping services• Official communications methods

• PC-based FLDVIEW execution– Currently coded for either HP-UX or PC


What next? (cont’d)• Internet map service selection

• User feedback– Design– Performance– User-friendliness

The End

Flood Forecast Mapping in AHPS October 28, 2003

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