Cecil county . FIG. 1.—BOHEMIA RIVER, WITH THIN FRINGE OF SHORE-TIMBER. Fig. 2.—little elk creek, with river birch and sycamore. HYDROGRAPHY OF CECIL COUNTY. MARYLAND GEOLOGICAL SURVEY 265 the revolutions per second being plotted as abscissae, and the velocitiesper second as ordinates. A smooth curve is then drawn through thesepoints, and any desired intermediate velocities can then be interpo-lated. A rating table is then constructed, taking the data from thiscurve. When the measurement of a stream is made and the number ofrevolutions of the wheel noted, the velocity of the flow can be deter-
Cecil county . FIG. 1.—BOHEMIA RIVER, WITH THIN FRINGE OF SHORE-TIMBER. Fig. 2.—little elk creek, with river birch and sycamore. HYDROGRAPHY OF CECIL COUNTY. MARYLAND GEOLOGICAL SURVEY 265 the revolutions per second being plotted as abscissae, and the velocitiesper second as ordinates. A smooth curve is then drawn through thesepoints, and any desired intermediate velocities can then be interpo-lated. A rating table is then constructed, taking the data from thiscurve. When the measurement of a stream is made and the number ofrevolutions of the wheel noted, the velocity of the flow can be deter-mined at once by reference to this table. Knowing the velocity ineach of the smaller sections across the stream, and the area of each,the quantity of water passing can be found by multiplying the twotogether, and the total flow past the station is found by the summa-tion of the flow through all partial areas. In this way the actual flowof the river can be found on various days. A list of measurementsmade in this way of the Octoraro is given on one of the followingp
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectgeology, bookyear1902
