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Quantity and Quality of Runoff from a Beef Cattle Feedlot in Southern Alberta

^a Agriculture and Agri-Food Canada, P.O. Box 3000, Lethbridge, AB, Canada T1J 4B1
^b Alberta Agriculture, Food and Rural Development, Lethbridge, AB, Canada T1J 4V6
^c Department of Biological Sciences, 4401 University Drive, University of Lethbridge, Lethbridge, AB, Canada T1K 3M4
^d Department of Renewable Resources, General Services Building, University of Alberta, Edmonton, AB, Canada T6G 2H1
^e Chinook Regional Health Authority, 960-19th Street South, Lethbridge, AB, Canada T1J 1W5

View larger version (41K): [in a new window]   Fig. 1. Layout of the beef cattle feedlot in southern Alberta that was used in this study.

View larger version (32K): [in a new window]   Fig. 2. Runoff hydrographs for 2-yr (Event 2) and >50-yr (Event 11) return period events in relation to daily rainfall for a beef cattle feedlot in southern Alberta. The hydrographs for west and east alleys for Event 11 on 8 June 2002 are incomplete because water in the catch basin rose to the level of the weir, and runoff could not be measured thereafter. Note that the scales for the y axis are different for Events 2 and 11.

View larger version (22K): [in a new window]   Fig. 3. Relationship of runoff and rainfall for 10 runoff events from a beef cattle feedlot in southern Alberta. Event 11 is not included because only partial runoff was measured.

View larger version (28K): [in a new window]   Fig. 4. Persistence of E. coli, total coliforms, and total heterotrophs at 27°C in effluent of a feedlot catch basin over a 2-yr (1998–1999) period. Gray arrows indicate times when the catch basin was dry, and black arrows indicate times when the catch basin was replenished with feedlot runoff.

View larger version (25K): [in a new window]   Fig. 5. Persistence of E. coli, total coliforms, and total heterotrophs at 27°C in catch-basin soil over a 2-yr (1999–2000) period. Arrows indicate times when the catch basin contained water. The term MDL is the minimum detection limit.