The wetlands of southern Louisiana and their drainage . at along the eastside as a highway. The levee alongLake Pontchartrain was built withwheelbarrows, of a soil that is veryporous and contains a high percent-age of vegetable material, and asthere is a canal quite close to theinside slope it is reasonably certainthat the seepage is fact that underlying this thicklayer of muck there is a subsoil ofporous sand would make seepageprobable, not only under the smalllevee along the lake, but also underboth wide levees along the interior drainage canals havebeen cut to th
The wetlands of southern Louisiana and their drainage . at along the eastside as a highway. The levee alongLake Pontchartrain was built withwheelbarrows, of a soil that is veryporous and contains a high percent-age of vegetable material, and asthere is a canal quite close to theinside slope it is reasonably certainthat the seepage is fact that underlying this thicklayer of muck there is a subsoil ofporous sand would make seepageprobable, not only under the smalllevee along the lake, but also underboth wide levees along the interior drainage canals havebeen cut to the sizes shown in figure17. and have been maintained nearlyto their original size. Their averagedepths are from 6 to 8 feet. About2 feet of water is kept in the canalsto check the growth of extensive system of lateralditches has yet been constructed on this tract, only a few in the immediatevicinity of the improved section having been dug; these, however, drain buta small percentage of the total area. When the entire tract is well drained. Fig. 17.—Sketch map of area No. 8, New Or-leans, La., showing arrangement of ditchesand levees. AreaNo. Parish. Town. 1 Area. Depth ofmuck. Eleva-tionabovemeangulf. Spac-ing oflat-erals. To] 1 23 Jefferson do Waggaman— Lockport Raceland do Allemands Poydras Gueydan Morgan Paradis La Rose do (Golden Mead-\ ows. a* 9402,400 1,880 2,500 2,840 640 2,560} 1,780 Feet. 0 -3 1 -21 -2 0 -1 0 -20 -3 0 -30 -2 -2-2 0-30-3 0-2 0-1 1-41-6 0-30-3 0-30-2 Feet. : 5 2 4 2I 4 Feet. 1 100I 450 160 200210 210 165 330330 330210 210200 Fee } 45 6 79 1011 1213 do do St. Vermilion St. Mary St. Charles La do do 22 6 24 23 35 44 56 44 46 1 Maximun 25102°—Bull. 71—14. (To face page 53.) DRAINAGE OF WET LANDS OF SOUTHERN LOUISIANA. 53 the run-off probably will be more rapid than at present. The drainage waterdischarges by gravity through th
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