Correspondence should be addressed to

The Director,
United States Geological Survey,
Washington, D. C.

FOOTNOTES:

[A] At six-hour intervals.

[B] Approximately

[C] Including water discharged through fixed openings, in a flood similar to that of October, 1903. Maximum discharge, 12,000 cubic feet per second.

[D] Includes water discharged through fixed openings for a flood similar to that of October, 1903. Maximum flow, 12,000 cubic feet per second.