<p>Reference(s):</p> <p>Schuster &amp; Turner (1996)</p> <p>Wyllie &amp; Mah (2009)</p> <p>&nbsp;</p> <p><strong>Method Summary</strong></p> <p>Installing a drainage system is one method of improving the stability of a rock slope. To measure the effectiveness of drainage, piezometers are used to measure the water pressure within the rock slope. Piezometers are buried in the slope to measure the water pressure in the immediate vicinity of the device. Differences in water pressure before and after drainage techniques were installed are observed.</p> <p><strong>Accuracy and Precision</strong></p> <p>Accuracy and precision are based on the calibration of the piezometers. As well as proper placement and installation of the device.</p> <p><strong>Adequacy of Coverage</strong></p> <p>Piezometer monitoring measures the local water pressure. A device is required for each point where there may be water pressure buildups, such as zones of fractured rock, sheared rock, or fault zones.</p> <p><strong>Implementation Requirements</strong></p> <p>A thorough understanding of the site&rsquo;s geology is required. This is so piezometers are placed strategically to monitoring positions where water pressure has a higher probability of causing slope instability.</p> <p><strong>General Comments</strong></p> <p>This test is a relatively simple and effective method. Other than being used as a quality assurance method for drainage systems, the test can be conducted before stabilization measures are taken for investigative purposes.</p>