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sources. They are most likely to be a combination of single dwelling septic tanks
and farmyard infrastructure and the impact will be reach specific depending on
agricultural intensity and rural population density.
Figure 1: Hourly rainfall, discharge and TP concentration time-series from
April to October 2005 in a 5-km 2 agricultural mini-catchment
CONCLUSIONS
Routine monitoring of eutrophic streams on a weekly to monthly basis may largely
sample non-diffuse P transfers. In some agricultural catchments, where diffuse
sources are assumed to transfer most of the annual P load, monitoring on such a
coarse resolution will not adequately assess the effects of managing P loss from soils
after mitigation measures and are more likely to continue measuring the impacts
from rural point sources.
ACKNOWLEDGEMENTS
We acknowledge support from SEUPB (INTERREG IIIa 020204) and NERC (NER/H/
S/1999/00164) for personnel and infrastructure funding.
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