American Society of Civil Engineers


Residence Time Distributions of Shallow Basins


by Edward L. Thackston, F.ASCE, (Prof. and Chmn., Dept. of Civ. and Envir. Engrg., Vanderbilt Univ., Nashville, TN 37235), F. Douglas Shields, Jr., M.ASCE, (Acting Chf., Water Resour. Engrg. Group, Envir. Lab, U.S. Army Corps of Engrs., Waterways Exp. Station, Vicksburg, MS 39180), and Paul R. Schroeder, M.ASCE, (Envir. Engrg., Envir. Lab, U.S. Army Corps of Engrs., Waterways Exp. Station, Vicksburg, MS 39180)

Journal of Environmental Engineering, Vol. 113, No. 6, November/December 1987, pp. 1319-1332, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9372(1987)113:6(1319))

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Document type: Journal Paper
Abstract: An analysis of data from a variety of basins showed that the strongest influence on hydraulic efficiency, t¯/T, was that of the length-to-width ratio, L/W. Wind and depth also had some influence. Equations were derived to show these influences and to predict t¯/T, so designers can know how much to increase the ideal retention time. The L/W ratio can be increased, and the adverse effects of wind can be decreased, by the use of baffles. Two baffles, producing an L/W ratio of 5–10, are usually sufficient.


ASCE Subject Headings:
Retention basins
Sediment
Water depth
Water treatment
Wind