WSP07449

• File Number: 8056
• Description: Drought Preparedness
• State: CO
• Basin: Statewide
• Date: 7/1/1985
• Author: Resource Consultants
• Title: Droughts and Their Effect on the Water Supplies for the City of Fort Collins Colorado
• Water Supply Pro - Doc Type: Report/Study

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LIST OF FIGURES

1.

Drought Terminology.............................................

Page

3

2.

8

Location Map................ ....................................

3.

Comparison of Annual Virgin Flows for Poudre and
Colorado Rivers Using Historic Period of Record.................

13

4.

16

Probability Plot of Poudre River Annual Virgin Flows 1884-1983..

5.

Bar Graph of Stochastically Generated Poudre
River Virgin Flows from Data Set 2..............................

19

6.

Comparison of Annual Poudre River Virgin Flows and Average
Tree-Ring Indices for Estes Park and Owl Canyon Stations........

21

7.

Bar Graph of Poudre River Virgin Flows
Generated from Tree-Ring Records................................

22

8.

Historic Droughts on the Poudre River...........................

28

9.

Graphical Representation of Different Drought Types.............

32

10.

Representative Droughts Selected from
the Stochastically Generated Record.............................

34

11. Allotments from C-BT System..................................... 43

12. Historic Diversions by C-BT System
Versus Poudre River Virgin Flows................................ 44

13. Network Configuration for River Basin Model..................... 47

14. Calibration Results for Storage and Irrigation Demands.......... 55

15. Calibration Results for River Gages............................. 56

16. Calibration Results for Return Flows and C-BT Inflows........... 57

17. Basin Model Results for 1: 20 Drought............................ 59

18. Basin Model Results for 1:50 Drought............................ 60

19. Basin Model Results for 1:100 Drought........................... 61

20. Basin Model Results for 1:500 Drought........................... 62

21. Network Configuration for Ft. Collins Model..................... 64

22. Summary of System Operation Studies
for Droughts Assumed to Begin in 1985........................... 79

23. Demand-Drought Relationships.................................... 81