GEOL 3030 Intro to Hydrogeology, Assignment #3 Tuesday, September 25, 2018 1. Th

Question

GEOL 3030 Intro to Hydrogeology, Assignment #3 Tuesday, September 25, 2018 1. The term water table refers to a. all of the water within the zone of saturation. b. all of the water within the soil c. the boundary between groundwater and surface water d. the boundary between the unsaturated and the saturation zones. 2. The configuration of water tables is usually: a. opposite to the topography, with highs in valleys and lows under hills. b. following the topography, with highs under hills and lows in valleys. c. flat, because water seeks its own level. d. random and unpredictable 3. A perched water table is a water table: a. that lies at an extremely high angle b. that is found high in the mountains. c. that sits on top of the zone of saturation. d. found on top of an isolated region of saturation above the normal water table. 4. The hydraulic conductivity to horizontal flow at a point in an aquifer is 5.0x10 cm/sec. The porous medium is anisotropic with K, (horizontal) five times greater than K (vertical). Measurements indicate a horizontal hydraulic gradient of 0.002 and a vertical hydraulic gradient of 0.0006. Calculate the x and z components of the specific discharge 5. (Fetter P148, 8) An aquifer has a hydraulic conductivity of 12 fiday and an effective porosity of 17% and is under a hydraulic gradient of 0.0055 a). Compute the specific discharge b). Compute the average linear velocity c). The water temperature was 14 C and the mean pore diameter was 0.33 mm. Was it permissible to use Darcy's law under these circumstances? What is the reason for your answer? 6. (Fetter P148, 2, added c)) A fluid in an aquifer is 23.6 m above a reference datum, the fluid pressure is 4390 N/m2, and the flow velocity is 7.22 104 m/s. The fluid density is 1000 kg/m. a) What is the total energy per unit mass? b) What is the total energy per unit weight? c) What is the hydraulic head? 7. (Freeze & Cherry, p77, 1) The following field data were taken at a nest of piezometers installed side by side at a site: Piezometer Elevation at surface (m.a.s.I) 450 Depth of piezometer (m) Depth to water (m) A, B, and C are the points of measurement for piezometers A, B, and C. Calculate: a). The hydraulic head at A, B, and C b). The pressure head at A, B, C c). The elevation head at A, B, C d). The fluid pressure at B e). The hydraulic gradients between A and B and between B and C. 150 27 450 100 47 450 50 36

Explanation / Answer

1 d.the boundary between the unsaturated and the saturation zones.

Note: Water table refers to the boundary between the unsaturated and the saturation zones.Beneath the water table rocks /soil are filled with water.Regions of water below the water table are called as aquifers.

2.b.following the topography ,with highs under hills and lows in valleys

Note: The configuration of the water table is usually of the same model of topography as the surface of land with highs under hills and lows in valleys .

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