Chicago : Engineering and Contracting Pub. Co. · leaf 428
24 hours from the largersub-watersheds and V2 in. from the smallerwatersheds as a basis for planning suggesteddrainage improvements along the WestBranch of the Des Moines River. This depthmay safely be adopted as a standard averagefor watersheds of similar rates of maximumrainfall and similar… … I-2j II on 15 SewerPipeT. EncjUContg Fig. A—Design for Inlet Located to OneSide of Tile Line. records should be kept of natural stream dis-charges over as long periods of time as pos-sible and the known discharge of similarwatersheds investigated and compared. Al-though a large number of ditches…
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