Area separation of streamflow in an upland catchment with partial peat cover

The problem considered here is: how to measure the discharge from a raised mire in terrain that is only partly mire-covered. The approach involves comparison of the stream discharge from a mixed mire and mineral-soil sub-catchment with that from a neighbouring non-mire sub-catchment. Inconclusive results have previously been obtained using naturally occurring chemical tracers, and the validity of an alternative area-separation method is now examined.