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<br />...... <br />-..1 <br />W <br />c;Q <br /> <br />From these measurements, coordinates can be calculated in <br />the office using triangulation formulas. In the case of <br />small streams, 50' or less in width, coordinates for <br />points A,B,C, & 0 may be measured directly in the field. <br />Incidentally, a hand lens is almost essential for accurate <br />reading of the Vernier scale on the clinometer. <br /> <br />. <br /> <br />6' Reconnaissance Data in Relation to Detailed Data <br /> <br />. <br /> <br />For the six selected reaches where existing cross-section <br />data were available, many points had been measured so as <br />to be able to reproduce an actual outl ine of the stream <br />bed. The reconnai ssance methodo 1 ogy does not attempt to <br />do this, but uses the points A,B,C, and 0 plus the loca- <br />tion and measurement of maximum water depth to outl ine a <br />geometric figure approximating the stream bed configura- <br />tion. Because this was a test of the methodology, only <br />these points on the cross-section and the resulting geo- <br />metric outline of a cross-section were used even in <br /> <br />instances where more detailed information was available. <br /> <br />7' Details of Cross-section Procedures <br /> <br />. <br /> <br />The general location of the segments cross-sectioned and <br />the procedures used in obtaining reconnaissance-level <br />cross-section data, recording field notes, and calculating <br />coordinates are presented in attachment C (2, 3, and 4). <br /> <br />27 <br />