. Mosquito control in Panama; the eradication of malaria and yellow fever in Cuba and Panama. Mosquitoes; Public health. Attack by Drainage 143 Where sharp bends or curves occur in lined ditches, and especially on heavy grades, provision must be made to prevent storm water climbing out of the ditch, and undermining a considerable section of the lining. This is easily arranged by introducing one or more key walls on the outer side of the curve, widening the ditch near the point of curvature, or by raising the outer wall in. Goncrete Lining EelnforcingTViro Reinforced Goncxete Tlnlng, J Junction
. Mosquito control in Panama; the eradication of malaria and yellow fever in Cuba and Panama. Mosquitoes; Public health. Attack by Drainage 143 Where sharp bends or curves occur in lined ditches, and especially on heavy grades, provision must be made to prevent storm water climbing out of the ditch, and undermining a considerable section of the lining. This is easily arranged by introducing one or more key walls on the outer side of the curve, widening the ditch near the point of curvature, or by raising the outer wall in. Goncrete Lining EelnforcingTViro Reinforced Goncxete Tlnlng, J Junction of branch ditch with a lined ditch. the vicinity of the point of curvature. In small ditches the same result is obtained by decreasing the slope of the outer wall, or making it vertical near the point of curvature. It is not advisable to have a branch ditch meet a larger ditch and be at right angles to it. It is better to curve the small ditch near the junction of the two so that they meet in a Y joint. If this is not done, much vegetable debris, mud, and stone may be deposited in the smaller ditch. It is well to make the main ditch somewhat wider at junc- tion points, sharp bends, and points of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Le Prince, Joseph Albert Augustin, 1875-; Orenstein, Alexander Jeremiah, 1879-. New York London, G. P. Putnam's sons
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