We study the diurnal streamflow cycles in a high altitude catchment where a large field campaign has been undertaken. In one monitored sub-basin, the cycle is evapotranspiration-dominated, in another, the cycle is icemelt-dominated. The two processes happen at the same time of the day but with opposite signs. Our results suggest that the amplitude of icemelt dominated streamflow is damped by evapotranspiration in the riparian area.