. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . -zgI-o COCO Ooro. 222 RAILROAD CONSTRUCTION. § 191. between two parallel vertical head walls, as sketched in , a. From a hydraulic standpoint the design is poor, as thewater eddies around the corners, causing a great resistancewhich decreases the flow. Fig. 102, h, shows a much better de-

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