rational formula


Also found in: Medical.

rational formula

[′rash·ən·əl ′fōr·myə·lə]
(hydrology)
The expression of peak discharge as equal to the product of rainfall, drainage area, and a runoff coefficient depending on drainage-basin characteristics.
References in periodicals archive ?
Depending on local regulations, some landscape experts use the rational formula, a complicated mathematical calculation that's keyed to local conditions, to determine the garden's size.
The STORM program generates runoff using 49 years of hourly data from Jacksonville long-term rainfall records and the rational formula. If runoff exceeds the "treatment rate" (defined flow rate for settling) and the storage provided in the system, the excess runoff is shunted past the system and the runoff is considered untreated.
Sir Michael called on the Government to abolish the 'mumbo jumbo masquerading as a rational formula' and replace it with a procedure which was easily understood.
"Since some originative sources are present in soulless things, and others in things possessed of soul, and in soul, and in the rational part of the soul, clearly some potencies will be non-rational and some will be accompanied by a rational formula." In the production of works of art, non-rational potency may be attributed to chance.