Physical features of the Des Plaines Valley . with stratified sedimentsand a flood-plain is formed—a flat valley bottom, usually above theriver level but submerged whenever the river is swollen by rains suffici-ently to fill its channel to the brim. During low-water stages the river does very little work. It is too weakto carry any significant amount of sediment. Even at ordinary stagesthe river works slowly and laboriouslv: but during floods, when thevolume of the stream is considerably increased, its power as a carrier isenormously increased, and it is then that the cut-and-fill process isef
Physical features of the Des Plaines Valley . with stratified sedimentsand a flood-plain is formed—a flat valley bottom, usually above theriver level but submerged whenever the river is swollen by rains suffici-ently to fill its channel to the brim. During low-water stages the river does very little work. It is too weakto carry any significant amount of sediment. Even at ordinary stagesthe river works slowly and laboriouslv: but during floods, when thevolume of the stream is considerably increased, its power as a carrier isenormously increased, and it is then that the cut-and-fill process iseffective and flood-plains are constructed. It may be demonstrated thatthe transporting power of a river varies as the sixth power of its velocityand that its velocity varies as the cube root of the volume, if the shapeof the channel be disregarded. In other words, the carrying power varies.
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