Dike
or DYKE, a word variously used to represent a ditch or trench, and also an embankment, rampart, or wall.
It is specially applied to an embankment raised to oppose the incursions of the sea or of a river, the dikes of Holland being notable examples of works of this kind. Laws concerning dikes are found in the old Saxon and Swabian codes. The ancient ordinances concerning dikes rest for the most part on the unwritten law or autonomy. The most important and complete code of regulations is the ordinance of the Duchy of Bremen of 1743. Of later ordinances the Prussian law of Jan. 28, 1848, and the so-called "Deichordnung" for the Duchy of Oldenburg, June 8, 1855, are notable. Owing to the possibility of great loss of property and of life, the punishment of all neglect or for malicious mischief to dikes is extremely severe. The dikes which protect the Netherlands and the German coasts of the North Sea go back to the old Roman times. Apparently_even before the Romans appeared the Batavians at the mouth of the Rhine protected themselves by dikes. Drusus after the conquest of Holland, 10 в. c., built an elaborate system of artificial canals and dikes. Pliny the Elder gives interesting descriptions of the artificial hills, which were erected at places of refuge during the floods. In the 10th and 11th centuries the archbishops in Bremen summoned the native inhabitants to the building of dikes to protect the marshes of Bremen.
Among the provinces in north and south Holland which have been protected by dikes may be mentioned the province of Hanover, 618 miles, protecting 770,000 acres of marsh land. On the left bank of the Oder river there is a dike which protects more than 170,000 acres of land.
The dike at the delta of the Vistula proare 115,000 acres protected by dikes. Along the Loire river are 280 miles protecting 230,000 acres. there are 310 miles protecting 850,000 Along the Po acres. In England there are 1,750,000 acres protected by dikes.
In the United States the term dike is almost wholly restricted to the structures of more or less permanence built in varegulate its flow, narrow the low water regulate its flow, narrow the low water cross section, concentrate the current, increase its local scouring effect and thereembankments designed to restrain the embankments designed to restrain the flood waters are called levees. The most notable examples are found along the Mississippi river where it winds its way built up below the mouth of the Ohio river. These levees are placed some little distance back from the river, and according to the local conditions vary in height from two or three feet to over 20 feet. In 1850 the General Government granted to some of the States certain public swamp lards, the revenue from which was to be used in levee building.
With the exception of this aid from the United States, all levees up to 1882 were built by funds raised by local taxation of the lands to be benefited and administered by levee boards organized under State laws. Since 1882 the General Government has pursued the policy of aiding the local levee boards in raising and strengthening their levees.