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Drain Gauge User's Manual <br />2. Installing the Drain Gauge <br />extreme cases, sediments can also enter the sampling res- <br />ervoir, leading to erroneous readings. This will not occur <br />once the soil has experienced moderate irrigations or rain- <br />fall events. <br />Figure 10: Final Drain Gauge installation <br />- P M. <br />We recommend that you install a sprinkler valve box next <br />to the Drain Gauge to provide easy access and protection <br />to the calibration and sampling tubes. Valve boxes are <br />readily available from sprinkler supply stores. The valve <br />box should be placed far enough away from the Drain <br />Gauge installation so it does not interfere with the site. <br />1. First, dig a hole large enough to accommodate the <br />valve box. <br />