. Determination of stream flow during the frozen season . 3000 4-000 5000 6000 CU. FT. PER SEC. 1904 DISCHARGE MEASUREMENTS = O 1905 = 9 1906 = • • FIGURES DENOTE DISTANCE FROM WATER SURFACE TO BOTTOM OF1CT. Fig. 5.—Rating curve under ice cover, Kennebec River at North Anson RIVER AT NORTH ANSON, ME. The effect of varying thickness of ice on discharge for a given gageheight is clearly shown (fig. 5). No one curve can be drawn through thepoints plotted for the gage heights to the water surface, although a few STATION RATING 0URVE8. 45 more gagings would, perhaps, enable a scries of
. Determination of stream flow during the frozen season . 3000 4-000 5000 6000 CU. FT. PER SEC. 1904 DISCHARGE MEASUREMENTS = O 1905 = 9 1906 = • • FIGURES DENOTE DISTANCE FROM WATER SURFACE TO BOTTOM OF1CT. Fig. 5.—Rating curve under ice cover, Kennebec River at North Anson RIVER AT NORTH ANSON, ME. The effect of varying thickness of ice on discharge for a given gageheight is clearly shown (fig. 5). No one curve can be drawn through thepoints plotted for the gage heights to the water surface, although a few STATION RATING 0URVE8. 45 more gagings would, perhaps, enable a scries of curves to be drawnfor different distances from the water surface to the bottom of theice. It is preferable to use these distances rather than thickness ofthe ice, for the position of the bottom of the ice with reference tothe water surface is not only dependent on the ice thickness (ingeneral being about 92 per cent of it), but will also vary with the. 2000 3000 4000 DISCHARGE-CU. FT. PER SEC. 5000 6000 1903 DISCHARGE MEASUREMENTS = © 1904 = O 1905 = O 1906 = •FIGURES 0ENOTE DISTANCE FROM WATER SURFACE TO BOTTOM OF ICE Fig. 6.—Rating curve under ice cover, Connecticut River at Orford, N. H. snow load and thus include its effect. If gage heights to the bot-tom of the ice are used a fairly consistent curve is obtained for thisstation. CONNECTICUT RIVER AT ORFORD, N. H. The same general results appear here as in the case of the Ken-nebec, although the range of ice thickness is less (fig. 6). The gagings of1903 and 1904 are open to some question, owing to the manner in 46 STREAM FLOW DURING THE FROZEN SEASON. which they were made, and have been given little weight in draw-ing the curve as shown. GENERAL FORM OF RATING CURVE FOR ICE COVER. The curve, as constructed with gage heights to the bottom of theice, in general lies to the left of the open-water rating curve, buttends to approach it in its lower portion and perhaps to cross i
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