. Bulletin of the Department of Agriculture. Agriculture; Agriculture. WET LANDS OF SOUTHERN LOUISIANA. 33 lias been made harder because the land near the railroad is from 1 to 2 feet lower than that near the lateral canal. As a result the ditches have had to be 5 feet deep near the lateral canal in order to give a scant 2 feel of draipage near the railroad. While the surface of most all the prairie lands is nearly flat, it is best to take advantage of the natural slopes in laying out the field ditches. Ditching operations were started in 1911 and continued through the following years as
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. WET LANDS OF SOUTHERN LOUISIANA. 33 lias been made harder because the land near the railroad is from 1 to 2 feet lower than that near the lateral canal. As a result the ditches have had to be 5 feet deep near the lateral canal in order to give a scant 2 feel of draipage near the railroad. While the surface of most all the prairie lands is nearly flat, it is best to take advantage of the natural slopes in laying out the field ditches. Ditching operations were started in 1911 and continued through the following years as the land was desired for cultivation. All of the land between the main reservoir canal and the railroad had been drained in 1915 with ditches spaced 210 feet apart, and the land on the other side of the main canal had been par- tially drained with ditches spaced about S40 feet apart. As soon as this land is needed for cultivation it will be ditched completely. Pumping Plant. The pumping plant is located about 300 feet back from the bayou front, on a leveed outfall canal. This location was selected that advantage might be taken. Pig. 8.—Sketch plan and elevation of one unit in pumping plant on Des Allemands Drainage District. of a firm ridge of silt as a foundation for the machinery. The arrangement and character of the foundation are shown in figure 8. There are two duplicate units, each consisting of a 24-ihch, cast-iron, double-suction, horizontal, centrifu- gal pump, direct connected by means of a flexible coupling to a 12 by 12 inch, ver- tical, slide-valve steam engine. The suction and discharge pipes are tapered their entire length, so that the area of the end of the intake is four and one-half times and the area of the discharge pipe three times that of the discharge opening on the pump. This enlargement of the pipes probably reduces the friction and velocity head losses to less than foot, while if they were not enlarged the losses would amount to nearly 4 feet. Th
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