SEP 23'28

LETTER OF TRANSMITTAL.

UNITED STATES DEPARTMENT OF AGRICULTURE,
WEATHER BUREAU, OFFICE OF THE CHIEF,
Washington, D. C., October 2, 1913.

The honorable the SECRETARY OF AGRICULTURE.

SIR: I have the honor to transmit herewith a report on the Ohio and Mississippi floods of 1912, prepared by H. C. Frankenfield, professor of meteorology, United States Weather Bureau. I recommend the publication of this report as a bulletin of the Weather Bureau.

LIST OF ILLUSTRATIONS.

CHARTS.

1. Drainage basin of the Mississippi River.

2. Weather map 8 a. m. March 11, 1912. and precipitation during following 24 hours. 3. Weather map 8 a. m. March 14, 1912, and precipitation during following 24 hours. 4. Weather map 8 a. m. March 20, 1912, and precipitation during following 24 hours. 5. Weather map 8 a. m. March 23, 1912, and precipitation during following 24 hours. 6. Weather map 8 a. m. March 28, 1912, and precipitation during following 24 hours.

7. Weather map 8 a. m. April 1, 1912, and precipitation during following 24 hours. 8. Depth of snow on ground March 4, 1912.

9. Depth of snow on ground March 11, 1912.

10. Depth of snow on ground March 18, 1912.

11. Depth of snow on ground March 25, 1912.

12. Normal and actual precipitation January, 1912.

13. Normal and actual precipitation February, 1912.

14. Normal and actual precipitation March, 1912.

15. Normal and actual precipitation January 1 to April 2, 1912.

16. Departure from normal precipitation January, 1912.

17. Departure from normal precipitation February, 1912.

18.. Departure from normal precipitation March 1 to April 2, inclusive, 1912.

19. Departure from normal precipitation January 1 to April 2, inclusive, 1912.

20. Normal and actual precipitation January, 1882.

21. Normal and actual precipitation February, 1882.

22. Normal and actual precipitation March, 1882.

23. Normal and actual precipitation January and February, 1882.

24. Departure from normal precipitation January, 1882.

25. Departure from normal precipitation February, 1882.

26. Departure from normal precipitation January 1 to February 28, inclusive, 1882.

27. Normal and actual precipitation January, 1897.

28. Normal and actual precipitation February, 1897. 29. Normal and actual precipitation March, 1897.

30. Departure from normal precipitation February, 1897.

31. Departure from normal precipitation March, 1897.

32. Departure from normal precipitation February 1 to March 31, inclusive, 1897.

33. Normal and actual precipitation January, 1903.

34. Normal and actual precipitation February, 1903. 35. Normal and actual precipitation March, 1903.

DIAGRAMS.

I. Crest stages in the Mississippi River during floods of 1882, 1897, 1903, 1912, and 1913.

II. Crest stages in principal tributaries during floods of 1882, 1897, 1903, 1912, and 1913.
III. Hydrographs for floods of 1912.
IV. Hydrographs for flood of 1882.
V. Hydrographs for flood of 1897.
VI. Hydrographs for flood of 1903,

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