. Geology and agriculture. ory can only be learned by deduction, havetaken place here within a few years. Lakes have been formedand destroyed ; stream beds formed and abandoned ; waterfallsproduced to destroy themselves ; new streams formed out ofparts of the beds of old ones; and temporary reversals of thedrainage systems have been effected. Present Topography and DrainageRed River Location of area.—The main region under discussion is anirregular area lying in the Red river valley between Shreveportand the line between Louisiana and Arkansas. Red river valleyin this region is from four and a
. Geology and agriculture. ory can only be learned by deduction, havetaken place here within a few years. Lakes have been formedand destroyed ; stream beds formed and abandoned ; waterfallsproduced to destroy themselves ; new streams formed out ofparts of the beds of old ones; and temporary reversals of thedrainage systems have been effected. Present Topography and DrainageRed River Location of area.—The main region under discussion is anirregular area lying in the Red river valley between Shreveportand the line between Louisiana and Arkansas. Red river valleyin this region is from four and a half to eight miles wide. Slope from the river.—As in other alluvial flood plains thegreatest elevation is along the present banks of the this line the plain slopes both ways to the bounding amount of this slope varies in different parts of the levels run by Lieut. E. A. Woodruff, U. S. Eng., in 1871-72, as plotted on a map in the archives of the War Department,show the following slopes :. in] Special Report No. 2 ; Shreveport Area 153 Sl^OPES OF lyAND FROM RiVER BANK TO BORDERING HiLLS Between Distance Inlet to Red bayou and Black lake bayou Inlet to Irishmans bayou and mouth of Dooleys bayou on Shift-Tail lake Inlet to Cottonwood bayou and mouth of Irish- inlet to Cottonwood bayou and Head of the Passes i Cold Point Bend to Albany Pandora Bend to Twelve Mile bayou. : Slopein feet 1-3 .46 .5 560 While the above table gives the average slope it gives no ideaof the slope curve, it is much greater near the river bankand less near the distant hills. The slope for the first thousandfeet from the river is generally at the rate of about 30 feet,although it is sometimes over 100 feet, to the mile. Width of the channel.—The variation in the width of the chan-nel of Red river, and its size in proportion to its tributariesfrom Shreveport to the State line must be a source of consider-able
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
