ABSTRACT
Floods, average annual flows, and low flows of streams are used for various hydraulic design and water-resources planning purposes. There are many US Geological Survey gaging stations with adequate records available for use, but there is considerable uncertainty involved in predicting flows at sites some distance from those gaging stations. A goal of many hydrologic engineers and scientists is to better understand, and to be able to predict, various components of precipitation—runoff (or basin system input- output) relationships. The investigation of the landform features of drainage basins has developed from the early works of philosophers and geologists. The more specialized fields of physical geography and hydrology were combined into the concepts of a morphometric system during the past 30 yrs. (Chorley, 1969). The introduction of precipitation from a specific storm tends to increase the potential variability in the precipitation—runoff relationship. In the past few years new methods of hydrologic analysis have been developed in the state of Washington.
