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7. Adequate preventive maintenance of equipment is essential. <br />Current meters should be cleaned and oiled each time they are <br />used, and frequently during use if the stream is carrying much <br />sediment. Also, current meters should be spin-tested prior to <br />each use (see Appendix B). Levels should be calibrated once a <br />year, and immediately if dropped or knocked over. <br />8. Under no circumstance should taglines or boats be anchored to <br />headstakes. <br />g. It is always better to enter a river measurement exercise <br />over-equipped than under-equipped. This is particularly <br />appropriate when using a boat in the collection of data. If a <br />stream section or river stage appears to be unsafe to work in, <br />do not work in it. Even if the data can be collected without <br />drowning anyone, it is likely to be somewhat sloppy and of <br />limited value in the hydraulic simulation. Suggested types of <br />equipment for work in various sizes of river are listed in <br />Appendix 0. <br />10. A good rule of thumb is to collect data in the upstream <br />direction; however, when using a tagline, start measurements <br />at the upstream cross section and move downstream. This way <br />the tagline may be moved with, not against, the current. <br />v <br />?J <br />?1?