EESB04H3 Lecture Notes - Lecture 9: Losing Stream, Hydrograph, Hydraulic Conductivity
1 Dec 2016
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Lecture 9 groundwater & initial forays into streamflow. Nests = multiple piezometers at different depths. Flow rate proportional to column diameter and gradient of head. Q = volume rate of flow (m3/d) Dh/dx = difference in total hydraulic head (h) over distance. A = area of porous medium through which flow occurs (m2) Porosity does not have good relationship with hydraulic conductivity. Porosity related to permeability (pore space)/bulk density. Homogenous k is same everywhere (same in two different locations) Isotropic k is same in all directions. Directional difference, hydraulic conductivity same left to right, up and down (rare) Arsenic in groundwater, doesn"t degrade easily since alloy. Contaminants can retains for years when there is longer reservoir storages. Groundwater movement depends on characteristics of system. Resembles ohm"s law = electrical current continuous circuit directly proportional to potential voltage difference and inversely proportional to resistance in.
