Forest physiography; physiography of the United States and principles of soils in relation to forestry . Fig. 217. — One of the Red River rafts after partial recutting of filled channel, 1873.(Veatch, U. S. Geol. Surv.) ATLANTIC AND GULF COASTAL PLAIN 537 material in that direction until in the latter part of the fifteenth cen-tury it had reached a point near iVlexandria. The effect of the naturaldam which the raft created was to raise the level of the river on theupstream side of it and cause a ponding not only of the main river but. Fig. 218. — Showing diversion of Red River below Alexandria
Forest physiography; physiography of the United States and principles of soils in relation to forestry . Fig. 217. — One of the Red River rafts after partial recutting of filled channel, 1873.(Veatch, U. S. Geol. Surv.) ATLANTIC AND GULF COASTAL PLAIN 537 material in that direction until in the latter part of the fifteenth cen-tury it had reached a point near iVlexandria. The effect of the naturaldam which the raft created was to raise the level of the river on theupstream side of it and cause a ponding not only of the main river but. Fig. 218. — Showing diversion of Red River below Alexandria, La., and location of rapids. Map alsoshows typical drainage features in the Red River and Mississippi River flood plains. (Veatch, U. Surv.) also of the tributaries within the reach of the ponded portion of themain stream. In some cases the rise of water in the main stream wassufl&cient to cause it to discharge about the natural dam and throughthe timbered bottom lands on one side or the other. Driftwood wouldbe quickly accumulated about the new point of discharge and again the 538 FOREST PHYSIOGRAPHY channel would be shifted. At the end of about 200 years (estimated)the lower part of the raft began to decay and the front of it to moveupstream as a great irregular accumulation of log jams and open water about 160 miles in average rate of advancewas about four-fifths of amile a year during theperiod between 1820 and1872, though the rate wasintermittent and to a largeextent dependent upon thedischarge
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
