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1) required a deep soil: this is not typical in the catchments and a vegetation stress factor should probably be incorporated into the grass model. However, the fact that most summers during the measurement period have been wet suggests that such a factor could be small. Other important sources of uncertainty are total evaporation losses from bilberry and mesomires and evaporation from snow cover on rough moorland vegetation. the transpiration of upland grass. The work losses and the areal cover of each vegetation type in different altitude zones.

1993) prior to the land-use changes. After partitioning effective rainfall between surface runoff and infiltration, transpiration loss, soil moisture changes and recharge to ground water under each vegetation area are computed on a daily basis. The surface runoff and the recharge components are then lumped and reservoir and delay functions similar to those incorporated in the HYRROM version are used to compute the rapid response and baseflow contributions to streamflow. These are then combined to give predicted daily streamflow values.

The land-use model was developed to extend the usefulness of the lumped conceptual model by incorporating the physical process models of evaporation from each major vegetation type (forest, grassland and heather) into the general model stucture. , 1989). In this version (Figure 18) the loss functions used for transpiration and ~~~"\kRnf -\ 4 inerepio A$ Interception Ru~~~~ntereon, Runol I (Flow) Rainfall Evaporation Time Store Time SFooe ~~~~~~~~~~~~~~ ~t ren FLo Transpiration Dclay Sodl Sto'e I 1 Groundwater figure 18 The HYRROMmodel 25 ~~~Time | Delay P Time possible to follow the model calibration by a model validation, in the strictest sense, on a comparable run of data.

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