Increased Logarithmic Weir Profiles

by D. Chandrasekaran, Assoc. Lect.; Hydr. and Water Resour. Dept., Coll. of Engrg., Madras, India,
N. S. Lakshmana Rao, Prof.; Civ. and Hydr. Engrg. Dept., Indian Inst. of Sci., Bangalore, India,

Serial Information: Journal of the Hydraulics Division, 1974, Vol. 100, Issue 11, Pg. 1583-1599

Document Type: Journal Paper

Abstract: The reverse problem of computing the shape of a weir profile for achieving an assumed discharge-head relation is solved. In a logarithmic weir, the discharge is proportional to the logarithm of the head measured from a certain datum. This weir needs a compensating bottom since its discharge-head relation involves a term of head which has less than 3/2 power. Different shapes of compensating bottoms as provided earlier in a linear proportional weir are also fitted for the logarithmic weir. The ranges of logarithmic weir profiles have been increased for the purpose of passing a design discharge under weir flow condition. This has been achieved with the help of an arbitrary number introduced into the discharge-head relation. Experiments were conducted on two typical logarithmic weirs that yielded a value of 0.60 for the coefficient of discharge.

Subject Headings: Weirs | Head (fluid mechanics) | Water discharge measurement | Geodetic datum | Linear functions | Flow profiles | Arbitration |

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