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Evaluating the long-term future of fine sediment in Lake Powell

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Presentation on theme: "Evaluating the long-term future of fine sediment in Lake Powell"— Presentation transcript:

1 Evaluating the long-term future of fine sediment in Lake Powell
Madeline Friend CEE 6440 December 7, 2017

2 Overview Introduction: Where? When? Who? Purpose: Why? Analysis: How?
Lake Powell Aerial View Overview Introduction: Where? When? Who? Purpose: Why? Analysis: How? Case Study Summary: What? Beyond this course: What’s next?

3 Introduction Lake Powell and Glen Canyon Dam
Second-largest reservoir in the United States Supports more than 38 million people Upper Basin water repository on Colorado River Law of the River mandates 8.23 million acre feet transferred from Lake Powell to Lake Mead annually Photo: Bureau of Reclamation

4 Introduction Downstream importance: Grand Canyon and beyond
Photo: Amy Martin

5 Purpose How much storage capacity of Lake Powell is filled with sediment? Relationship between changing reservoir levels, catchment input, and geology

6 Analysis: Data Sources
Elevation ArcGis online servers Streams NHDPlus USGS Stream Stats, Version 4 (Beta) Valuable for understanding basin characteristics of ungaged sites Geology USGS integrated geologic databases

7 Analysis: Basin Delineation
Upstream of Colorado River at Lees Ferry USGS Gage

8

9 Analysis: Stream Properties & Hydrologic Terrain

10

11 Analysis Calculated contributing catchments at various reservoir levels Full pool (3,700 ft. = 1,128 m) Minimum power pool (3,490 ft. = 1,064 m) Dead pool (3,370 ft. = 1,027 m)

12

13 Analysis: Area

14 Analysis: Length

15 Analysis: Drainage Density

16 Analysis: Case Study

17 Analysis: Case Study

18 Analysis: Case Study North Wash Geology

19 Analysis: Case Study Erosion rates
Non-linear function of sediment supply, grain size, and bedrock tensile strength Sklar and Dietrich (2001) Tensile strength of Glen Canyon Group Bursztyn et al. (2015) Sklar and Dietrich (2001)

20 Summary Necessity of Colorado River water management Analysis
Climate change, increased demand, less available water Analysis Interoperability with online and desktop services Overlaying various physical data sets Rainbow Bridge, 1962 Photo by Philip Hyde

21 Beyond this course… Focus on full pool to minimum power pool
Relevant parameter for policy discussion and adaptive management Categorize watershed by erodibility Calculate total volume available for tributary sedimentation Pre-dam topography and full pool Evaluate total volume filled for erodible and resistant rock

22 Questions? Thank you!

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