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Mary Guokas Montana Department of Natural Resources and Conservation

A Sample Power Point to Introduce the Floodplain Simulator to Your Students October, 2013 MEA-MFT Conference. Belgrade, Montana . Mary Guokas Montana Department of Natural Resources and Conservation. Which one makes a “bigger” flood? . Wetland (Sponges). Parking Lot.

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Mary Guokas Montana Department of Natural Resources and Conservation

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  1. A Sample Power Point to Introduce the Floodplain Simulator to Your StudentsOctober, 2013 MEA-MFT Conference. Belgrade, Montana Mary Guokas Montana Department of Natural Resources and Conservation

  2. Which one makes a “bigger” flood? Wetland (Sponges) Parking Lot

  3. 1964 Flathead County Flooding: In Evergreen, the water came up to La Salle Road (now U.S. 2). Getting from Woodland Park to East Reserve Drive required a boat. Photo credit: Possibly Daily Inter Lake Newspaper.

  4. Flooding causes hardship and a lot of extra work. 1986. Flathead County. Photo source: Unknown

  5. Montana Department of Natural Resources Floodplain Management Program

  6. What is a floodplain?

  7. What is a floodplain? An area that could flood.

  8. Floodplain Management Floodplains may not appear to be at risk of flooding. Floodplain near Lolo Creek in Ravalli County. Direction of flow. Lolo Creek going toward the Bitterroot River.

  9. Floodplain Management But even adding a “small” amount of water can put them at risk. Same floodplain as previous photo with “water added”, during a “10-year” flood event, a relatively minor flood event. May, 2008.

  10. Floodplain Management Flooding during a minor, approximate “10-year” flood event. No flooding. Depending on the shape of the floodplain, carrying capacity of the river, etc. generally… A “100-year” flood event (1% chance flood event) could be far more extensive. A “500-year” flood event (0.2% chance event) could be really extensive!

  11. What is a floodplain? Some floodplains are called Special Flood Hazard Areas (SFHA) by FEMA, many people commonly call these 100-Year Floodplains. Special Flood Hazard Area 100-Year Floodplain

  12. What is a floodplain? The term 100-year floodplains can be a misnomer as flooding in these floodplains may occur more or less often than 100 years. Special Flood Hazard Area 100-Year Floodplain

  13. What affects the severity of a flood? • Twin Bridges, Montana. Photo credit: Madison County DES

  14. What affects the severity of a flood? • Rain • Snowmelt • Twin Bridges, Montana. Photo credit: Madison County DES

  15. What affects the severity of a flood? • Rain • Snowmelt • Frozen Ground • Twin Bridges, Montana. Photo credit: Madison County DES • Water can’t penetrate frozen ground.

  16. What affects the severity of a flood? • Rain • Snowmelt • Frozen Ground • Recent Fires • Twin Bridges, Montana. Photo credit: Madison County DES • Water can’t penetrate frozen ground.

  17. What affects the severity of a flood? • Rain • Snowmelt • Frozen Ground • Recent Fires • Types of • Groundcover • Twin Bridges, Montana. Photo credit: Madison County DES • Water can’t penetrate frozen ground.

  18. What affects the severity of a flood? • We can’t do much • about these: • Rain • Snowmelt • Frozen Ground • Recent Fires • Twin Bridges, Montana. Photo credit: Madison County DES • Water can’t penetrate frozen ground.

  19. What affects the severity of a flood? We may be able to do something about types of groundcover • Twin Bridges, Montana. Photo credit: Madison County DES • Water can’t penetrate frozen ground.

  20. Natural Ground Cover i.e. Wetlands What’s the percent runoff with Natural Ground Cover? Above and following illustration based on “Stream Corridor Restoration: Principles, Processes, and Practices” 10/1998, by the Federal Interagency Stream Restoration Working Group.

  21. Runoff associated with Natural Ground Cover =10%

  22. Impervious Surface: Hard surface like concrete

  23. Runoff associated with 10% to 20% impervious surfaces =20%

  24. Runoff associated with 35% to 50% impervious surfaces 30%

  25. A “Very Impervious Surface” i.e. Parking Lot What’s the percent runoff on a “Very Impervious Surface?

  26. Runoff associated with “Very impervious surfaces” =55%

  27. Over natural ground cover such as wetlands, about 10% of precipitation runs across the land and may result in small floods. Over developed land surfaces where parking lots exist, 55% of the precipitation may run across the land, which likely results larger floods.

  28. Using a stream gauge to measure flooding severity.

  29. ?

  30. 5.10

  31. 4.96

  32. ?

  33. 5.24

  34. Floodplain Simulator Activity

  35. Entering data into spreadsheet with different flooding scenarios.

  36. Completed spreadsheet.

  37. Hydrograph created from data in spreadsheet.

  38. Blank data sheet is used to enter data as a backup to data entered on spreadsheet.

  39. Student reading the stream gauge during a simulation. Students from Mr. Slead’s class making observations during a flooding simulation. Helena. Student explaining a hydrograph created from simulations, to fellow students.

  40. Is there an alternate place to build? “Building in a floodplain is like pitching your tent on a highway when there are no cars coming”. Dr. Vicki Miller, University of Montana

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