Distributions of BOD and DO in Rivers and Lakes

by Robert B. Banks, (M.ASCE), Prof. of Environmental Engrg. and Research Engr.; Inst. of Engrg., National Autonomous Univ. of Mexico, Mexico,

Serial Information: Journal of the Environmental Engineering Division, 1976, Vol. 102, Issue 2, Pg. 265-280

Document Type: Journal Paper


The differential equations for horizontal distributions of biochemical oxygen demand (BOD) and dissolved oxygen (DO) are presented. In general, these equations cannot be solved. Therefore, a mixing cell model is developed which is based on the assumption that the concentrations of BOD and DO throughout a cell are equal to their concentrations in the effluent from the cell. Two examples are given: (1) Flow from a source and (2) flow from an infinite row of sources. Results obtained with the mixing cell model agree closely with results given by solutions to the differential equations. The method is employed to determine distributions of BOD and DO in Lake Chapala, Mexico. Computed values are in fair agreement with measured values.

Subject Headings: Rivers and streams | Lakes | Differential equations | Oxygen demand | Dissolved oxygen | Effluents | Developing countries | Agreements and treaties | Mexico

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