An application of a physically based semi-distributed model to the Balquhidder catchments

A physically based semi-distributed model, TOPMODEL, is applied to the two catchments at Balquhidder. The model uses a topographic index which highlights hydrologically significant areas within the catchments. The model is used to simulate runoff and to compare the behaviour of the two catchments. The results indicate that a large proportion of stream water is generated from saturated contributing areas (source areas); the Monachyle has higher contributions of water of this type. The results may also indicate that the hydrology of the Monachyle catchment has changed following agricultural improvement by increased drainage; a damped subsurface response is observed.