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Nutrient runoff from non-agricultural areas -- two catchments in Norway

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131618648,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Håkon Borch
Keywords:   Nutrient runoff forest areas water quality watershed reference studies.

Abstract. Reference values and runoff coefficients are relevant to the implementation of The European Water Framework Directive, and data presented here could be of great value for further assessment of reference conditions in lakes and waters. In two JOVA-catchments, Skuterud and Volbu, runoff has been monitored runoff of nutrients and SS from smaller sub catchments with non-agricultural areas, mainly forested area or barren land. Data from these catchments, together with compiled data from other Norwegian studies of runoff from non-agricultural areas, are presented and discussed in this chapter. The concentrations of nitrogen (N) from forested areas in Skuterud are over twice as high as in Nyhagabrøtin. Annual losses of phosphorus (P) from forest field Nyhagabrøtin are in average 43 g total (T) P / ha with an increasing trend. The average P concentrations from Skuterud are 2.2 times higher than in Nyhagabrøtin. This may indicate a level of P losses around 95 g TP / ha. Annual average loss of suspended solids (SS) from Nyhagabrøtin is 13 kg SS/ha. These data helps to understand the complex variability of runoff depending on soil characteristics, precipitation and temperature.

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