hha_jan31_gwmovement

# hha_jan31_gwmovement - Darcy Experiment Today (Jan 31):...

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1 Today (Jan 31): Groundwater Movement Weds (Feb 2): – Wells and Mapping hydraulic head – Homework 1 due (beginning of class) – Quiz 3 – In class: Start Homework #2 Darcy Experiment Darcy’s Law: q=K i O slope Or Q = KiA ι slope =K lower limit of Darcy’s law • probable that there is a “threshold gradient”, below which no flow will occur upper limit of Darcy’s law • the linear relationship between velocity and gradient true only for laminar flow • for turbulent flow, head losses are greater. Darcy’s law does not hold Q i laminar turbulent Hydraulic head includes both elevation and pressure: h = z + P/ ρ g h 1 h 2 Δ h l 1 l 2 Hydraulic head represents energy: -Potential energy due to elevation -Energy due to pressure Decrease in head during flow reflects loss of energy due to friction Lower permeability (or hydraulic conductivity) means more friction. h 1 h 2 Δ h l 1 l 2

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2 Measuring hydraulic head: Drill (or dig) well and measure water level.
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## This note was uploaded on 10/19/2011 for the course GLY 3882 taught by Professor Screaton during the Spring '09 term at University of Florida.

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hha_jan31_gwmovement - Darcy Experiment Today (Jan 31):...

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