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Drowning In A Dry Creek Bed

Drowning In A Dry Creek Bed. Bob DeVyldere OWRD. Providing tools to help people deal with water quantity extremes. Peak flow estimator Peak discharges from a gaging station Peak discharges from prediction equations Water availability modeling. Peak Flow Estimator.

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Drowning In A Dry Creek Bed

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  1. Drowning In A Dry Creek Bed Bob DeVyldere OWRD

  2. Providing tools to help people deal with water quantity extremes • Peak flow estimator • Peak discharges from a gaging station • Peak discharges from prediction equations • Water availability modeling

  3. Peak Flow Estimator • Accessed from the Oregon Water Resources Department web page,http://www.wrd.state.or.us/OWRD/SW/index.shtml#Estimation_of_Peak_Streamflows • www.wrd.state.or.us Surface WaterEstimation of Peak Streamflows • Adobe Acrobat reader required

  4. Five ways to obtain estimates of peak discharges • From estimates of peak discharge at a gaging station • From among unmeasured, but already defined watersheds • By manually entering the required characteristics • By submitting a user-delineated watershed • By using the auto-delineation program

  5. Estimates of peak discharge at a gaging station • Measurements of peak discharges have been made on a systematic basis • Estimates of peak discharges at specified frequencies have been made • Estimates may be viewed by selecting a gaging station from list of measured watersheds

  6. From among unmeasured, but already defined watersheds • OWRD has delineated and calculated characteristics for approx. 1,200 watersheds in western Oregon • Estimates of peak discharge may be obtained by selecting a watershed from an interactive on-screen map

  7. Manually entering the required characteristics • User supplies eight watershed characteristics necessary to determine peak discharge estimates • Making appropriate and reliable estimates of watershed characteristics may be difficult for most users

  8. Submitting a user-delineated watershed • User supplies watershed delineation • Delineation must be submitted as a "shape file" in Oregon Lambert coordinates • A shape file is an open specification for a GIS theme developed by Environmental Systems Research Institute, Inc. (Redlands, CA)

  9. Using the auto-delineation program • User selects a point on a stream where the peak discharge estimates are desired • Selection of the point is done interactively from topographic maps displayed on-screen • Delineation of the watershed above the selected point, calculation of the watershed characteristics, and calculation of the peak discharges are done automatically

  10. Delineated watershed

  11. Things to be aware of • Select point well away from confluence • Avoid bridges, dams or large road fill • Areas of low relief or urbanization • Always check resulting characteristics and graphic

  12. Future development • East side of state • Provide shapefile • List of (93) watershed characteristics • Faster processing?

  13. Water Availability Tool • Primarily used in decision making for evaluation of new water right applications • Also used to identify areas for stream flow restoration efforts • In use for over 10 years • Simple web interface and more complex telnet interface

  14. Uses combination of technologies • Used GIS to determine geographical units • GIS based characteristics data sets • Good old blackboard math equations to bring it all meaning

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