. Determination of stream flow during the frozen season . s 2 6 n CUD 0^ can; *±a% ?r. -=? +»i ? 05 Si oc„ w oj p 05 o c 3 05 >- —c 05 +J -o s 2 05 J > °s a > 05 — g M j ^ 3 T3 mt3 a-a t; —— 05 rr b—. O - 05 05^X2 ii^5 m > > m >xS > 05 >a3c3S3c3GG3;>03 *j •» -^ * — g a sgO WINTKK RECORDS. 43 STATION RATING CURVES FOR ICE CONSIDERATIONS. At several stations sufficient data Lave been gathered to con-struct a rating curve for conditions of ice cover, applicable to aver-age ice conditions within the range of winter gage heights, hut thevariation in for
. Determination of stream flow during the frozen season . s 2 6 n CUD 0^ can; *±a% ?r. -=? +»i ? 05 Si oc„ w oj p 05 o c 3 05 >- —c 05 +J -o s 2 05 J > °s a > 05 — g M j ^ 3 T3 mt3 a-a t; —— 05 rr b—. O - 05 05^X2 ii^5 m > > m >xS > 05 >a3c3S3c3GG3;>03 *j •» -^ * — g a sgO WINTKK RECORDS. 43 STATION RATING CURVES FOR ICE CONSIDERATIONS. At several stations sufficient data Lave been gathered to con-struct a rating curve for conditions of ice cover, applicable to aver-age ice conditions within the range of winter gage heights, hut thevariation in form of curve with change in thickness of ice is stilluncertain, and the proper rating curve or coefficient to apply for thetime when the ice is thin has not been sufficiently verified by station rating curve for conditions of ice cover must evidently beconstructed on one of the following bases: (1) Gage heights to thesurface of the water as determined from a hole cut in the ice, or2) gage heights to the bottom of the N VELOCITY - FT PER SEC. Fig. 4.—Rating and velocity curves under ice cover, Wallkill River at Newpaltz, N. Y. In figs. 4 to 6 are shown the results of such gagings as have beenmade under ice cover at three gaging stations, the gage heights beingplotted in each of the above ways and the open-water rating curvebeing shown for comparison. WALLKILL RIVER AT NEWPALTZ, N. Y. So far as can be determined at present, the rating curve based ongage heights to the water surface seems to give the best results;that is, the points lie more nearly on a smooth curve (fig. 4). There isno great difference, however, except in the case of the lowest gag-ing, in which the thickness of the ice was perhaps only half of the 44 STREAM FLOW DURING THE FROZEN SEASON. distance, feet, from the water surface to the bottom of the ice,indicating that the water below the ice was under some will be noticed that the range in ice thickness is not la
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