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Henry Philibert Gaspard Darcy (born with Dijon the June 10th 1803 and died with Paris the January 2nd 1858) was a hydraulician French. General engineer of the Highways Departments, it is at the origin of the adduction of Eau (derivation and distribution of sources of drinking water) and of the passage of the Railroad in Dijon, contributing largely to the urban development.

After studies with the Royal College of Dijon (today college Marcelle Pardé), it enters in 1821 to the Polytechnic school, then in 1823 with the National school of the Highways Departments. It is named in 1827 candidate-engineer in Gold Coast.

It Marie in 1828 with English (Henriette Carey).

March 5th, 1834, he addresses a report/ratio to Mister the Mayor of Dijon on the means of providing water necessary to this city. Its project is to build a conduit of 12 km length subterranean water, since the source of Rosoir in the Valley Suzon to Dijon. Work begins in 1839. It is named chief engineer of the department of the Gold Coast the same year. Work is completed on September 6th, 1840. After 3 hours of course, 7000 liters of water arrive each minute in the tank of the Door Guillaume (today Place Darcy). July 18th, a water jet 9 height meters spouts out basin of the Place St-Pierre (today Place Wilson). This water provision contributed largely to the development of Dijon and the health of its inhabitants. In 1847, the running water arrives on all the floors of the buildings of Dijon, doing this one the second town of Europe best served after Rome.

Darcy is named city council man of Dijon on December 10th, 1834. It will remain until 1848. It is named Chevalier of the Légion of honor on August 31st, 1842 in recognition for the services of the engineer and those of the good citizen .

In 1845, he becomes member of the Academy of Science, arts and the humanities of Dijon. By recognition, in 1846, the town of Dijon grants to him during the remainder of its life a free supply water for its house.

Darcy also contributes on arrival of the railroad in Dijon. In 1844, it draws the layout of the railroad Paris-Lyon via Dijon. One owes him the creation of the tunnel of Blaisy-Bas, near Dijon.

In 1848, Darcy, considered to be unfavorable to the new capacity, is transferred of office by the provisional government to Bourges, with the service of the Canal of Berry. It remains there only little of time because as of on June 16th, 1848, it is transferred with the title of engineer as a chief-director to the head of the service of water and the roadway system of Paris. During its short stay in Bourges it is brought to work with the project of Canal of Sauldre through the Sologne, carried out as from the summer 1848.

In 1850, it is named General inspector of second class, but must ask a setting of availability the end of the year for health reason.

In 1856, it publishes its treaty on the public fountains of the Town of Dijon , where the formula appears which bears from now on its name. A measuring unit results from this: a darcy corresponds to the permeability of a body compared to a continuous and isotropic medium to through which a homogeneous fluid of viscosity equal to that of water with 20°C (one centipoise) moves there at the speed of 1 cm/s under the influence of a gradient of pressure of 1 atm/cm. It publishes another treaty in 1857, on the experimental Recherches relating to the movement of water in the pipes .

Shortly after its death in 1858, its name is given by the town of Dijon to the Place of the water Tower.

See too

External bonds

Obituary Very complete
the phenomenologic law of DARCY
Conference Darcy, Dijon 2006
Lessons of maths

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