Laserfiche WebLink
In some cases, where not too far from a night's lodging, time can be saved by <br />taking the samples in the morning or evening instead of during the warm part of <br />r~ t he day. <br />t ~ C. Neighing the Sample <br />fore taking the sample, place the empty sample tube in the cradle hanging <br />fr m the scales. If the Mt. Rose scale is used, turn the pointer back to zero. <br />If the standard tubular scale is used, record the weight empty in proper column <br />in field book. When the sample has been taken, place the sampler in the cradle <br />and record the weight for tube and core. For the Mt. Rose scale this reading <br />equals the water content of the snow core. For the standard tubular scale the <br />water content is given by the difference between the reading empty and the read- <br />ing for tube and core. The zero setting in the case of the Mt. Rose scale, and <br />the "empty" reading for the standard tubular scale should be checked at frequent <br />intervals (not more than 5 measurements). <br />If dirt is picked up by the cutter it should be cleaned out with knife before <br />weighing the sample, and proper deduction made before recording length of core or <br />depth of snow. <br />D. Recording <br />The snow cover survey sheets are made in pads of two sizes, the smaller being <br />white and the larger pink. Only the white waterproof pads are to be used for <br />field notes. The larger pink pads are to be used to make copies from the white <br />field sheets as soon as possible after each survey. Instructions regarding the <br />disposition of the pink copy sheets will be issued for each State and where <br />necessary for each drainage basin, since the needs will require some variation in <br />this respect. <br />Appropriate covers are to be provided for protection of field notes. Sketch <br />maps showing points of observation are pasted to the inside of the covers. <br />Use pencil only for recording field measurements. fill in complete description <br />of course, party, date, etc. <br />If the depth of core is very much less than the depth of snow, the reason <br />should be determined and noted under "Remarks". Determine and record density of <br />each snow sample through use of the density nomogram. If any individual density <br />differs markedly from that of neighboring samples a new sample should be taken. <br />"Remarks" should include special items as to the character of ,snow, nature and <br />condition of soil or other bottom reached by the cutter, whether wet, dry, fro- <br />zen, etc. <br />Any extended remarks as to weather conditions at the time of survey or shortly <br />before the survey, unusual difficulties encountered, etc., may be placed on the <br />back of the sheet, as one side only is to be used in recording the snow measure- <br />ments. <br />.~= , <br />I Or paraffin. <br />2 If the cutter is broken or badly worn, send first tube section with cutter <br />attached to your regional snow survey office for repair or replacement. <br />3 A complete core is evidenced when length of core compared to snow depth is <br />approximately the same throughout a course. <br />.-,, • <br />l l~, <br />