Temporal variability of two contrasting transient pollution events in a pastoral stream

Simple item page
dc.contributor.authorMwetu, Kennedy K.
dc.contributor.authorYillia, PT
dc.contributor.authorKreuzinger, N.
dc.date.accessioned2014-11-07T08:34:49Z
dc.date.available2014-11-07T08:34:49Z
dc.date.issued2010
dc.description.abstractTwo transient pollution events were monitored in a pastoral stream in southwestern Kenya to evaluate their relative contribution to diffuse pollution. Peak loads of pollutants during storm-induced transients were within 3-4 orders of magnitude higher than the short-lived (30-60 minutes) diurnal episodes provoked by in-stream activities of people and livestock. Transient yields were striking during storm-induced events; 778,000, 8,400, 550 and 100 kg day(-1) for suspended solids, BOD(5), total P and total N, respectively, compared to wet weather base flow (150, 30, 0.8 and 1.4 kg day(-1), for the same parameters, respectively). Two forms of concentration-discharge relationships were observed: increases in concentration for turbidity, suspended solids, BOD(5), total P and the faecal indicator bacteria at the peak of the stream hydrograph, and concurrent decreases in concentration for conductivity and total N. Following each storm-induced transient event, a marked improvement in water quality was observed within 48-72 hrs of the receding limb of the stream hydrograph before the next base low was established. It was concluded that storm-induced transients are exceedingly important for the mobilization of pollutants from diffuse sources but both transient events affect stream-channel processes, especially water quality, with the possibility of attendant consequences on the health of riparian inhabitants.en_US
dc.identifier.citationWater Science and Technology 2010;61(4):1053-63. doi: 10.2166/wst.2010.566.en_US
dc.identifier.issn0273-1223
dc.identifier.other1996-9732
dc.identifier.urihttp://www.ncbi.nlm.nih.gov/pubmed/20182086
dc.identifier.urihttp://ir-library.ku.ac.ke/handle/123456789/11625
dc.language.isoenen_US
dc.publisherIWA Publishingen_US
dc.titleTemporal variability of two contrasting transient pollution events in a pastoral streamen_US
dc.typeArticleen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Temporal variability of two contrasting ....pdf
Size:
5.24 KB
Format:
Adobe Portable Document Format
Description:
Abstract
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
RP-Department of Agricultural Resources Management (ARM)