# 1. Apply knowledge of the controlling variables for groundwater flow. 2. Demonstrate groundwater flow direction based on hydraulic head observations.

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1 .9-12 HYDRAULIC HEAD SUBJECTS: TIME: Science (Physical Science, Physics), Math 1 class period MATERIALS: Copies of student sheets and background information OBJECTIVES The student will do the following: 1. Apply knowledge of the controlling variables for groundwater flow. 2. Demonstrate groundwater flow direction based on hydraulic head observations. BACKGROUND INFORMATION The water in the ground (groundwater) fills pore spaces in the subsurface rocks and sediments. The water in the lower part of the zone of porosity fills all the pore spaces and creates a saturated material (Figure 1). The groundwater is stored or flows through the pore spaces and is acted on by three outside forces. These forces are: (taken from Fetter, 1988) 1. gravity- that which pulls water downward. 2. external pressure- a combination of atmospheric pressure and the weight of over lying sediments and water. 3. molecular attraction- that which causes water to adhere to other surfaces and to itself. 4-51

3 potential or towards the lower elevation head. The rate of groundwater flow towards a well or spring is proportional to the difference in elevation head between the source (high) and discharge (low) areas. Figure 3 Terms atmospheric pressure: the pressure or force per unit area, exerted by the atmosphere on any surface beneath or within it Bernoulli Principle: the statement in hydraulics that under conditions of uniform steady flow of water in a conduit or stream channel, the sum of the velocity head, the pressure head, and the head due to elevation at any given point is equal to the sum of these heads at any other point plus or minus the losses in head between the two points due to friction or other causes elevation head: the elevation of the point at which the hydrostatic pressure is measured, above or below an arbitrary horizontal datum fluid pressure: the mechanical energy per unit mass of a fluid, at any given point in space and time, with respect to an arbitrary state and datum (fluid potential) groundwater: water that infiltrates into the Earth and is stored in usable amounts in the soil and rock below the Earth s surface; water within the zone of saturation hydraulic head: the height of the free surface of a body of water above a given subsurface point; the sum of elevation, pressure, and velocity components at a given point in an aquifer pore space: the volume of the open spaces in rock or soil porosity: the spaces in rock or soil not occupied by solid matter 4-53

4 pressure head: the height of a column of liquid supported, or capable of being supported, pressure p at a point in the liquid by saturated zone: a portion of the soil profile where all pores are filled with water. Aquifers are located in this zone. There may be multiple saturation zones at different soil depths separated by layers of clay or rock. unconfined aquifer: an aquifer containing unpressurized groundwater, having an impermeable layer below but not above it unsaturated zone: a portion of the soil profile that contains both water and air; the zone between the land surface and the water table. The soil formations do not yield usable amounts of free-flowing water. It is also called the zone of aeration and vadose zone. water table: upper surface of the zone of saturation of groundwater ADVANCE PREPARATION A. Copy Background Information and Student Sheets for students. B. Copy or put on board terms and definitions for students. C. Enlarge and make transparencies of Figures 1-3 in Background Information. PROCEDURE I. Setting the stage A. Discuss Background Information using transparencies. B. Review vocabulary. 4-54

5 II. Activity A. Have students complete the Infiltration, Discharge, and Flow Direction Student Sheet by indicating the direction of flow of groundwater based on differences in elevation heads. Indicate, above the picture, points where water is likely to infiltrate the water table or discharge into a surface water body. B. Have students calculate the differences in head elevations between the highest point of the water table or h max and the water bodies, Lake 1 (h 1) and 2 (h 2 ), on either side of the island. Discussion questions: 1. Since h 1 is greater than h 2, does any water from L 1 flow across the island to discharge into L 2? Answer: h max is greater than h 1; therefore, water is flowing from the island into L 1, and the water from L 1 does not contribute to L If the island were to experience drought and there were no more precipitation, what would happen to the water table and groundwater flow conditions? Answer: The water table would decline, probably becoming a nearly flat surface, and provide a gradient of flow between L 1 and L 2. RESOURCES Bates, R.L. and Jackson, J.A., Editors, 1987, Glossary of Geology, 3rd Ed., American Geological Institute, p Driscoll, F.G., Groundwater and Wells, 2nd Ed., Johnson Division, 1986, p Fetter, C.W., Applied Hydrogeology, 2nd Ed., Merrill Publishing Co., 1988, p

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