Measured Leakage vs Avg Air Temp 6/19-7/21 100 160.0 140.0 90 120.0 80 100.0 80.0 70 60.0 60 Leakage 40.0 Temp Temperature (°F) Flow Rate (Gallons) with the onset of summer. Data collected during the period of time when ambient temperatures were increasing are shown in Figure 2. Because of the positive correlation with temperature, the phenomenon of surface tension went under the microscope. The unwillingness of the gravel to give up water has to do with surface tension of the water molecules. As temperatures increase, surface tension decreases, and the water is released more readily under the pull of gravity. The physical property affected by this is Sy. In fact, Sy is so temperature dependent that the testing temperature was standardized to 68°F (20°C) (Johnson 1963). An investigation of the property of Sy resulted in the discovery that it is not only temperature dependent 50 20.0 0.0 40 1 6 11 16 21 26 31 Days FIGURE 2 The correlation between leakage and temperature GeoForum is a highly technical geosynthetic short-course, where attendees hear from subject-matter experts about case studies of high profile projects which utilized geosynthetics, as well as cutting edge applications for geosynthetics. In addition to these informative talks, you will also enjoy a series of hands-on conceptual demonstrations. GeoForum 2020 marks the fifth occurrence of this HUESKER organized event, and for the first time, GeoForum is taking place in Washington DC. Don't miss the geotechnical event everyone is talking about. Visit www.GeoForum.us to register. www.HUESKER.us | E-mail: marketing.us@HUESKER.com | Toll Free: 800.942.9418 www.GeosyntheticsMagazine.com 0420GS_p16-23.indd 19 19 3/23/20 4:32 PMhttp://www.GeoForum.us http://www.HUESKER.us http://www.GeosyntheticsMagazine.com