In the Mississippi valley water is taken from the river by flumes in the levees or by siphons.
Nearly all of this vast flood-plain lies below the level of high water in the Mississippi, and, but for the protection afforded by the levees, every considerable rise of its waters would inundate vast areas of fertile and cultivated land.
The task of maintenance consists almost entirely in closing the gaps which occur when the banks on which the levees are built cave into the river.
Built in part upon "made land," well protected by levees, and lying within the richest cottonproducing region of the south, the rich timber country of the St Francis river, and the Mississippi "bottom lands," Helena concentrates its economic interests in cotton-compressing and shipping, the manufacture of cotton-seed products, lumbering and wood-working.
Some of the levees, especially those in swampy regions where outlet bayous are closed, are of extraordinary solidity and dimensions, being 20 to 40 ft.
The problem of inland waterways has always been a most important one in northern, eastern and southern Louisiana, where there are systems of improved bayous, lakes and canals which, with the levees, make this region something like Holland, on a greater scale.
Extensive levees, 15 m.
The storing of the floods in reservoirs at the headquarters of our rivers is but an enlargement of our present policy of river control, under which levees are built on the lower reaches of the same streams.
In the last Martial imagines his friend wandering about discontentedly through the crowded streets of Rome, and undergoing all the discomforts incident to attendance on the levees of the great.
With the exception of a few flat ridges running from north to south, it is so low that it requires, to protect it from overflows, an unbroken line of levees averaging 15 ft.
Of Mississippi river levees, within the state, was built almost entirely after 1866, and represents an expenditure of about $43,000,000 for primary construction alone; of this sum, the national government contributed probably a third (the state expended about $24,000,000 on levees before the Civil War).
Schools and levees absorb about half of all revenues, leaving half for the payment of interest on the state debt (bonded debt on 1st of April 1908, $11,108,300) and for expenses of government.
The leasing or hiring of state convicts is prohibited by the constitution, but parish convicts may be hired or leased for farm and factory work, work on roads and levees, and other public undertakings.
The lord provost and magistrates offer to him the keys of the city, and levees, receptions and state dinners revive in some degree the ancient glories of Holyrood.
"Levees" are formed, inside which the river usually flows, gradually raising its bed above the surrounding plain.