1. Precipitation & Interception
Ali Fares
Chapter 2
11/15/2018
Watershed Hydrology NREM 662 Dr. A. Fares.

2. Watershed Hydrology NREM 662 Dr. A. Fares.
Finish the lecture
Lab: how to spatially distribute rainfall and calculate average rainfall rate using two methods:
Thiessen Polygon Method
Isohyeth method
Lab assignment.
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

3. Rainfall Spatial Distribution
PRIZM model Site-specific Interpolation
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

4. Precipitation Estimation
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

5. Precipitation Estimation
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Watershed Hydrology NREM 662 Dr. A. Fares.

6. Precipitation Estimation
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Watershed Hydrology NREM 662 Dr. A. Fares.

7. Precipitation Estimation
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

8. Precipitation Estimation
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

9. Precipitation Estimation
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

10. Precipitation Estimation
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

11. Precipitation Estimation
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Watershed Hydrology NREM 662 Dr. A. Fares.

12. Watershed Hydrology NREM 662 Dr. A. Fares.
Missing Data
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

13. Watershed Hydrology NREM 662 Dr. A. Fares.
Missing Data
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

14. Rainfall Interception
Interception: Ic = Pg – Th – Sf
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

15. Rainfall Interception
Conifer forests in North America Ic = 15-40% of Pg
Natural teak forests in Thailand Ic = 65% of Pg
Is influenced by rain:
amount,
duration,
intensity,
and pattern
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

16. Rainfall Distribution & Intensity
Watershed Hydrology NREM 662 Dr. A. Fares.

17. Rainfall Canopy Interception
60%
40%
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

18. Precipitation Measurement
Rain gauges
storage,
weighing,
tipping-bucket
Problems
obstacles,
wind eddies,
evaporation
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

19. Precipitation Measurement
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

20. Tipping-Bucket: Demonstration
From the Automated Flood Warning System web site.
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

21. Precipitation Measurement
Under Canopy
Outside Canopy
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

22. Watershed Hydrology NREM 662 Dr. A. Fares.
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

23. Watershed Hydrology NREM 662 Dr. A. Fares.
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

24. Precipitation Measurement
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

25. Precipitation Measurement
The Standard Fog Collector (Schemenauer and Cereceda, 1994)
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.

26. Precipitation Measurement
11/15/2018 Fall 2006
Watershed Hydrology NREM 662 Dr. A. Fares.