The effects of clear-felling established forestry on stream-flow losses from the Hore sub-catchment G. Roberts1 and S. B. Crane2 1Institute of Hydrology, Wallingford, OX10 8BB, UK. 2Institute of Hydrology [Plynlimon], Staylittle, Llanbrynmair, Powys, SY19 7DB, UK.
Abstract. The effects on streamflow of clear-felling a substantial
part of the established forestry within the Hore sub-catchment at Plynlimon were estimated by a regression comparison
of pre-and post-felling rainfall/runoff relationships and by a model based
on evapotranspiration estimates from plot studies of established forestry and heather moorland. Increases
in streamflow were predicted using both methods, with those using the regression method
being substantially larger than those using the model. The largest increases using the regression
method occurred about 5 years after the end of felling, and amounted to 10.5% of the measured
On a seasonal basis, the largest increases using the regression method
occurred during the latter half of the year, whilst the model predicted the largest increases
during the summer months. These patterns are explained in terms of forest transpiration and canopy
Citation: Roberts, G. and Crane, S. B.: The effects of clear-felling established forestry on stream-flow losses from the Hore sub-catchment, Hydrol. Earth Syst. Sci., 1, 477-482, doi:10.5194/hess-1-477-1997, 1997.