Impacts of Low-Flow Rates on Recreational Rafting Traffic on the Colorado River in Grand Canyon National Park Catherine A. Roberts Joanna A. Bieri.

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Presentation transcript:

Impacts of Low-Flow Rates on Recreational Rafting Traffic on the Colorado River in Grand Canyon National Park Catherine A. Roberts Joanna A. Bieri

Basic Information Bureau of Reclamation, Grand Canyon Monitoring and Research Center (IA # 00-AA ) Cooperative agreement between Grand Canyon National Park & Northern Arizona University (CA# )

Contact Information Catherine A. Roberts Dept. Mathematics & Computer Science Holy Cross College Worcester, MA Joanna A. Bieri Dept. Mathematics & Statistics Northern Arizona University Flagstaff, AZ

Low Summer Steady Flow (LSSF) 17, ,000 cfs in April and May Four days of 31,000 cfs in early May Steady 8,000 cfs June - September Four days of 31,000 cfs in early September Glen Canyon dam releases during summer 2000

Objective of Study To examine the impact of LSSF on recreational rafting traffic on the Colorado River within the Grand Canyon National Park.

Outline of the Study Collect Trip Reports during LSSF. Place information into database. Compare “low flow” data to “typical flow” data collected during 1998/1999.

Trip Report

Trip & Flow Classifications Commercial = C Private = P Trip Length = days between Lees Ferry (river mile 0) and Diamond Creek (river mile 225.7). Low Flow = LSSF (8,000 cfs) Typical Flow = 1998/1999 (19,000 cfs)

Four Trip Types Motor –Short 8 or fewer days –Long 9 or more days Oar –Short 14 or fewer days –Long 15 or more days

Low Flow Trip Reports Short Motor 61 C, 0 P Long Motor 3 C, 3 P Short Oar 23 C, 2 P Long Oar 10 C, 18 P TOTAL = 120 Trip Reports 599 launches 20% return rate

Typical Flow Trip Reports Short Motor 222 C, 7 P Long Motor 18 C, 9 P Short Oar 64 C, 24 P Long Oar 18 C, 125 P TOTAL = 487 Trip Reports 1,689 launches 29% return rate

Boat Speed Low vs. Typical Flow

Boat Speed: Short Motor

Boat Speed: Long Motor

Boat Speed: Short Oar

Boat Speed: Long Oar

Average Daily Miles

Daily Number of Activities

Daily Time Spent on Activities

Conclusions No change in number of activities/day No change in number of miles/day Boats spent more time on water Boat speeds slower 50% reduction in time spent on activities

What’s Next? Analysis of campsite and activity visitation frequencies for “low” and “typical” flows. Final report to GCMRC Several graphs posted on our website: