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A B S T R A C T The concept of effective discharge, Q e , was introduced by Wolman and Miller (1960) as that stream discharge that transports the most sediment over time. Recently, the validity of Q e as an overall descriptor of sediment transport has been questioned because of its various interpretations and methods of calculation. A new discharge index-termed the "half-load discharge," Q 1/2 -was introduced as the discharge above and below which half of the total sediment load has beendoi:10.1086/657258 fatcat:jmcfckguufdlfb65psck2w24wi