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dc.contributor.authorBidwell, Vince J.
dc.date.accessioned2011-04-06T23:19:33Z
dc.date.available2011-04-06T23:19:33Z
dc.date.issued2004
dc.identifier.urihttps://hdl.handle.net/10182/3423
dc.descriptionOral presentation at the New Zealand Hydrological Society Annual Symposium, 16-20 November 2004, Queenstown, New Zealand.en
dc.description.abstractThe question of how much streamflow originates from groundwater is relevant to the issue of effects of land use on stream water quality. Whereas phosphorus from agricultural land is transported primarily by overland flow, nitrate is leached from the soil profile and moves to streams via saturated soil-water flow, installed drainage systems, and groundwater flow. The portion that is transported through groundwater is of particular interest because measurements of groundwater age show that average contaminant transport times, even in steep hillslopes (Mike Stewart, GNS Ltd), range from several to many years. This means that the response of nitrate concentration in streams to changes in land use in the catchment can be characterised by a time scale of years. The proportion of streamflow derived from groundwater is also relevant to streamflow quantity. The associated problems of quantifying baseflow separation, low flow recession, and relationships between streamflow and groundwater storage, have been the subjects of mathematical theories for the past 130 years.en
dc.language.isoenen
dc.publisherLincoln Ventures Ltd. Lincoln Environmental Research.en
dc.rightsCopyright © The Authoren
dc.subjectstream water qualityen
dc.subjectgroundwater dynamicsen
dc.subjectnitrate leachingen
dc.subjectgroundwater modellingen
dc.titleHow much streamflow is groundwater discharge? - a method for assessmenten
dc.typeConference Contribution - Unpublisheden
lu.contributor.unitLincoln Venturesen
dc.subject.anzsrc050205 Environmental Managementen
dc.subject.anzsrc050209 Natural Resource Managementen
lu.subtypeConference Oral Presentation


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