Abstract
The basic principle of the index‐area was first set forth by H. R. Leach, H. L. Cook, and Robert E. Horton in 1933 [see 1 of “References” at end of paper]. The fact that the index‐area idea as applied in that case gave results that checked as closely as they did seemed to establish that there must be come fundamental validity in the method. The work of the Muskingum Watershed Conservancy District has afforded opportunity to work with the method and to attempt to eliminate certain flaws and shortcomings that appear in the principle as applied in the paper referred to. It is planned to apply the principle on quite a large scale in forecasting the volume of flood‐water that will need to be handled in the flood‐control reservoirs and the channels of the Muskingum Watershed. Some expeditious scheme is essential. The index‐area method combined with the distribution‐graph as evolved by L. K. Sherman, Merrill Bernard, and others [2] seems to offer advantages over every other method available at present.

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