Unified presentation of weir-aeration data

Abstract

The literature on reoxygenation studies on free overall weirs has been reviewed with the main objective of investigating model scale effects. A nomogram has been presented for constant values of (r - 1) as a function of the nappe Froude and Reynolds numbers. Analysis of the nomogram indicates that small-scale Froude model studies tend to underestimate prototype reoxygenation, whereas laboratory experiments at prototype heights of fall tend to overestimate the reoxygenation if no consideration of flow rate is made. Correction factors for temperature and water quality effects have been examined. It is hoped that this nomogram will serve as a guide to the complicated interrelationships involved in the reoxygenation process and as a method for uniform presentation for comparison of data acquired in the future.