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<br />CONTENTS <br /> <br />58. Photograph showing wading measurement using top-setting rod___________ <br />59. Photograph showing ice rod being used to support current meter for a dis.- <br />charge measurement and ice drill being used to cut holes_h__u___h.__ <br />60. Diagram showing method of computing meter settings for measurements <br />underice_~._______________________________________________.______ <br />61. Typical vertical-velocity curve under ice cover._________________________ <br />62. Sample sheet of part of notes for discharge measurement under ice cover _ _ __ <br />63-65. Diagrams: <br />63. Determining position in the cross section section, stadia method_ _ __ <br />64. Determining position in the cross section, angular method_ _ _ _ _ _ _ __ <br />65. Position of sounding weight and line in deep, swift water _ _ _ _ _ _ _ _ __ <br />66. Sketch of geometry of relationship of actual to measured vertical angle when <br />flow direction is not normal to meaauring sectiODnn_hh_nn_hh___ <br />67-69. Chorts: <br />67. Computation of weighted mean gage height____._________________ <br />68. Discharge measurement notes with discharge adjusted for channel <br />storage e1fect___ __ _ _ _ _ _ _ _ __ _ __ _ __ _ _ _ __ _ _ _ _ _ _ _ ___ _ _ _ _ _ _ _ _ ____ <br />69. Discharge measurement notes with mean gage height adjusted for <br />time.of.travel of flood wave_ ___ _____n___nn_n____n___h__ <br />70. Expanded plot of goge-height groph during measurement 264 ot Big Creek <br />near ])ogwood, Va______________________________________________~_ <br />71. Sketch showing portable weir plate sizesu_h__h_____n_h_n___n_nn <br />72. Photograph of modified 3-inch Parshall flume made of sheet iron__________ <br />73. Working drawing of modified 3-inch Parshall flume__n_hhU___________ <br /> <br />TABLES <br /> <br />vn <br />Pa.. <br />39 <br />42 <br />43 <br />44 <br />45 <br />46 <br />46 <br />48 <br />51 <br />55 <br />56 <br />58 <br />59 <br />60 <br />61 <br />62 <br /> <br />Pale <br />1. Sounding ~ doto_______________________________________________________ 14 <br />2. Current-meter and velocity-measurement method for various depthsn~_n_h___ 39 <br />3. Velocity-measurement method for various suspensions and depths_n_______n__ 40 <br />4. Air-correction table, giving difference, in feet, between vertical length and slant <br />length of sounding line above water surface for selected vertical angles__ __ ___ _ 49 <br />5. Wet.-line table, giving difference, in feet, between wet-line length and vertical <br />depth for selected vertical angles____hhhhh__h_unuu__nn__nuu 50 <br />6. Degrees to be added to observed angles to obtain actual vertical angles___n__n 50 <br />7. Summary table for setting the meter at O.8-depth position in deep, swift streams__ 52 <br />S. Rating table for 3-inr.1l modified Parshall flume__h___________h_____nn____ 61 <br />