Journal ArticleDOI
Nonpoint Source Loading Rates From Selected Land Uses
TLDR
For example, this paper found that barnyards in a dairying watershed are potentially a major source of sediment and nutrients, especially those dissolved fractions which have the potential for immediate water quality impacts.Abstract:
Loading rates derived from monitoring natural runoff from selected land uses are compared. Land uses selected for evaluation are construction sites, barnyards, and agriculture (dairying). Runoff volumes, sediment, and nutrient fractions were monitored and expressed as areal loadings for comparison purposes.
Sediment yield and total phosphorus (total P) loss was directly proportional to runoff (m3/ha). In decreasing order, the loadings for sediment and total P were as follows: construction site > barnyard > general dairying. Runoff from the barnyard area was approximately 10 times higher in soluble phosphorus and ammonium nitrogen than the other land uses under investigation. Areal loss for nitrate nitrogen was highest from the construction site and was attributed to the higher volume of runoff per unit area.
Results show that barnyards in a dairying watershed are potentially a major source of sediment and nutrients, especially those dissolved fractions which have the potential for immediate water quality impacts. Relative to general agricultural land, urban construction sites also appear to be a major source of sediment and nutrients. As with barnyard sites, however, the effect of such sites on water quality likely depends on proximity to surface water bodies and other watershed characteristics affecting delivery ratios of contaminants.read more
Citations
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Journal ArticleDOI
Nitrogen and phosphorus exportation in the Garonne Basin (France)
TL;DR: In this paper, the authors measured the discharge-concentration relationship and the behaviour of the concentrations during storm events in two basins of the southwest of France: the Garonne (52,000 km2) and one of its tributaries, the Girou (520 km2).
Journal ArticleDOI
Surface water hydrology—runoff generation and basin structure
TL;DR: In this article, it is suggested that the current generation of physically based models of basin hydrology cannot predict runoff generation in the field with any adequacy because they are not good descriptors of runoff processes except under some special circumstances.
Journal ArticleDOI
Towards restoring urban waters: understanding the main pressures
Sven Teurlincx,Jan J. Kuiper,Ellen C. M. Hoevenaar,Miquel Lürling,Robert J. Brederveld,Annelies J. Veraart,Annette B.G. Janssen,Wolf M. Mooij,Lisette N. de Senerpont Domis +8 more
TL;DR: In this paper, the authors identify six pressures that have strong links to anthropogenic forcing including: eutrophication, aquatic invasive species, altered hydrology, altered habitat structure, climate change, and micropollutants.
Journal ArticleDOI
Evaluation of regression methodology with low-frequency water quality sampling to estimate constituent loads for ephemeral watersheds in Texas.
TL;DR: The regression method was quite variable in its ability to accurately estimate annual nutrient loads from the study watersheds; however, constituent load estimates were much more accurate for the combined 3-yr period, and it is suggested that for small watersheds, regression-based annual load estimates should be used with caution, whereas long-term estimates can be muchMore accurate when multiple years of concentration data are available.
References
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Predicting rainfall-erosion losses from cropland east of the Rocky Mountains
W. H. Wischmeier,Dwight D. Smith +1 more
Journal ArticleDOI
Rainfall energy and its relationship to soil loss
W. H. Wischmeier,Dwight D. Smith +1 more
TL;DR: In this article, a relatively simple procedure is presented for computation of kinetic energy of a rainstorm from information on a recording-raingage chart, and an equation is developed describing rainfall energy as a function of rainfall intensity.
Journal ArticleDOI
Sediment yield prediction based on watershed hydrology.
James Williams,H D Berndt +1 more
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