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Drain Gauge User's Manual <br />2. Installing the Drain Gauge <br />Figure 6. Initial excavation above DCT bole. <br />The depth of the Divergence Control Tube (DCT) hole <br />depends on the depth of the root zone. The objective of <br />the installation is to place the middle plate of the Drain <br />Gauge below the root zone of the cover vegetation. Thus, <br />the depth of the hole will vary between installations, but it <br />must be at least 70 cm deep. The DCT should be com- <br />pletely buried below the soil surface. <br />There are two different methods (see above) for installing <br />the drain gauge, depending on whether you use a dis- <br />turbed sample (Method 1) or an intact monolith (Method <br />2). <br />Method 1 Disturbed Sample). <br />Digging the hole for the Drain Gauge is most effective <br />with a sharpshooter shovel or post -hole digger and an <br />orchard auger with a long extension. <br />1. Make the initial vertical hole (for the divergence con- <br />trol tube) about 25 cm (10 in.) in diameter (slightly <br />larger than the tube itself) and at least 70 cm (27.5 in.) <br />deep. <br />4 <br />