Abstract
The sediment‐load of a natural stream may be considered to be made up of two parts, the wash load and the bed‐materials load [see 1 of “References” at end of paper]. The wash load is the fine material washed into and through the reach under consideration by storm‐runoff. The bed‐materials load is derived from the bed of the stream and may be transported either by rolling along the bed or in suspension. The various particles moving in suspension come into contact with the bed with a frequency depending on their size.

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