Скачать или смотреть Specific Storage and Storativity

This video introduces important characteristics of subsurface flows. We discussed the notion of Porosity, Specific Yield and Specific Retention in the last couple videos. Specific yield (Sy) is the ratio of the volume of water that drains from a saturated sample because of gravity to the total volume of the rock. The corollary is that Sr is the water left behind, attached to the matrix as a film around the grains and retained by surface tension. In confined aquifers, water cannot drain by gravity and the elasticity of the matrix becomes important. This is captured in the definitions of specific storage and storativity that we describe in this video.