Résumé :
|
River floods are the result of many causes, and one of the primary objectives of scientific hydrology is the segregation and evaluation of the causative factors. The Geological Survey topographic maps study 340 drainage basins in the northeastern United States. The data were compiled in cooperation with the Work Projects Administration of the federal works agency and included information on drainage area, length of streams, stream density, land slope, channel slope, area-altitude distribution, and area of water bodies of basins that ranged in extent from 1.64 to 7.797 square miles.
|