ABSTRACT
This chapter reports and synthesizes results obtained from several laboratory and field projects that were completed recently. Rainwash (material entrained by direct drag forces, plus material entrained by splash and transported by wash) pertaining to an alpine podzolic soil from the Canadian Rockies was found to range from 5.62 to 10.78 g m-2 min-1 with a coefficient of variation of 18.4%. Minor design modifications were incorporated to improve the separation of materials transported by rainwash and splash-saltation. In the case of Pontypool, the increased variability in runoff had little effect on rainwash because entrainment by splash-saltation was dominant. Where the dominance of splash-saltation in causing entrainment was partially eclipsed by turbulence in the raindrop-disturbed flow as in the case of Lockport, some increases in rainwash variability were observed. Moreover, the lower rainwash-runoff relationship in these soils implies that splash-saltation was dominant over flow turbulence in the entrainment of surface particles or aggregates.
