Hydrogeology: Flow in Aquifers and Rivers
In this content, various scenarios involving flow in aquifers and rivers are discussed. From estimating travel times of water molecules in confined aquifers to determining flow rates in unconfined aquifers between channels and rivers, different hydrogeological concepts and calculations are explored. Equations for unconfined aquifer flow with recharge are also presented. The content covers topics such as steady flow, effective porosity, hydraulic conductivity, and water table elevation estimation. Illustrative images and equations aid in understanding the complex dynamics of groundwater movement.
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Presentation Transcript
Steady flow in a confined aquifer If the distance and the observed piezometric surface drop between two adjacent wells are 1000 m and 3 m respectively, find an estimate of the time it takes for a molecule of water to move from one well to the other. K is 3.5 m/day and effective porosity is 0.35 h x From Mays, 2011, Ground and Surface Water Hydrology
Steady flow in an unconfined aquifer A stratum of clean sand and gravel between two channels has K=0.1 cm/s and is supplied from a ditch ho=6.5 m that penetrates to the bottom. If the water in the second channel is h1=4 m deep above the bottom of the stratum, estimate the flow rate From Mays, 2011, Ground and Surface Water Hydrology
Unconfined aquifer between two rivers An unconfined aquifer of clean sand and gravel is located between two fully penetrating rivers. K=10-2 cm/s. L=460 m, W=1.6 m/yr, h1=10 m, h2=8.5 m, ne=0.35 Estimate - Maximum elevation of the water table - Daily discharge per km from the aquifers into each river From Mays, 2011, Ground and Surface Water Hydrology
Unconfined aquifer flow equation with recharge 2 2 ? = ? ? ??= ?? ?? ??? ? +?? ? ???? ?? ??= ? ?2 ??2 2 2 = ? ?
