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The Effects of Low Steady Summer Flows on Whitewater Boating Safety

The Effects of Low Steady Summer Flows on Whitewater Boating Safety in Grand Canyon National Park. Linda Jalbert National Park Service. Background - previous recreational boating safety studies: 1985 - 1987: GCES I @ Medium, High, Flood constant & fluctuating flows

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The Effects of Low Steady Summer Flows on Whitewater Boating Safety

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  1. The Effects of Low Steady Summer Flows on Whitewater Boating Safety in Grand Canyon National Park Linda Jalbert National Park Service

  2. Background - previous recreational boating safety studies: 1985 - 1987: GCES I @ Medium, High, Flood constant & fluctuating flows 1991 - 1992: GCES II @ 5,000 cfs 1996: GCDAMP - BHBF @ 45,000 cfs 2000: GCDAMP - LSSF @ 8,000 cfs (some ~30,000 cfs)

  3. Objectives - Assess the effect of the LSSF on whitewater boating safety as measured by accident/incident rates - Compare accident/incident rates at 8,000 cfs to rates at other flows

  4. METHODS - Observations at House Rock, Hance, Horn, Crystal, Dubendorff, Lava, 231 and 232 - Examine NPS records: River Trip Incident Reports and NPS Case Incident Reports

  5. RESULTS - OBSERVATIONS 314 TRIPS 1,025 BOATS 8 LOCATIONS 58 DAYS

  6. RESULTS - Reported Incidents 1. Examine NPS Records: Trip Leader River Incident Reports NPS Case Incident Files 2. Compare reports from same time period for 1999 and 2000

  7. REPORTED BOATING INCIDENTS: Percentage of Hours, percentage of incidents, and number of incidents by Flow Category: June - Sept 1999 and June - Sept 2000

  8. Conclusions Compared to other flows, the 8,000 cfs constant flow had the greatest impact on motorized rafts (and thereby the greatest number of recreationists) - more boats were grounded, more people terminated their trips, more equipment damage was reported

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