PPT-Flow to Wells – 1 Steady flow to a well in a confined aquifer

Groundwater Hydraulics Daene C McKinney 1 Summary Some Information on Wells Steady flow to a well in a confined aquifer 2 Some Information on Wells 3 Domestic Hand Pumped Well Domestic dug well with rock curb concrete seal and hand pump. Groundwater Hydraulics. Daene. C. McKinney. Introduction. Review. Continuity in Aquifers. Steady flow to a well in confined aquifer. Superposition. Two Wells in an Aquifer. Image Well . for an Impermeable Boundary. Hydrogeology. Module 4. Flow to Wells. Preliminaries, Radial Flow and Well Function. Non-dimensional . Variables, . Theis. “Type” curve, and Cooper-Jacob Analysis. Aquifer boundaries, Recharge, . Groundwater Hydraulics. Daene C. McKinney. Summary. Confined Aquifer Flow. Continuity Equation. Steady Horizontal Flow. Transmissivity. Unconfined Aquifer Flow. Continuity Equation. Steady Horizontal Flow. Hydraulic Head. Bernoulli’s Equation. Hydrostatic Pressure. Hydraulic Head. Bernoulli’s Equation. Hydrostatic Pressure. Hydraulic Head. Total Hydraulic Head (drop velocity – why?). . Or. Hydrogeology. Module 4. Flow to Wells. Preliminaries, Radial Flow and Well Function. Non-dimensional . Variables, . Theis. “Type” curve, and Cooper-Jacob Analysis. Aquifer boundaries, Recharge, . By: Lauren Cameron. Introduction. Partially penetrating wells:. aquifer is so thick that a fully penetrating well is impractical. Increase velocity close to well and the affect is inversely related to distance from well (unless the aquifer has obvious anisotropy). Hydrogeology. Instructor: Michael Brown. brown@ess.washington.edu. Module 4. Flow to Wells. Preliminaries, Radial Flow and Well Function. Non-dimensional . Variables, . Theis. “Type” curve, and Cooper-Jacob Analysis. Groundwater Hydraulics. Daene C. McKinney. Summary. Confined Aquifer Flow. Continuity Equation. Steady Horizontal Flow. Transmissivity. Unconfined Aquifer Flow. Continuity Equation. Steady Horizontal Flow. By: Lauren Cameron. Introduction. Partially penetrating wells:. aquifer is so thick that a fully penetrating well is impractical. Increase velocity close to well and the affect is inversely related to distance from well (unless the aquifer has obvious anisotropy). Basic Assumptions. Aquifer bounded on the bottom. Horizontal Geologic Formations (with infinite extent). The potentiometric surface is horizontal and is steady prior to pumping. Any changes in potentiometric surfaces are due to pumping . From Mays, 2011, Ground and Surface Water Hydrology. 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 . Flow in Aquifers – 2 Unconfined Aquifer Flow Groundwater Hydraulics Daene C. McKinney 1 Summary Unconfined Aquifer Flow Continuity Equation Steady Horizontal Flow Steady Horizontal Flow with Infiltration Aquifer bounded on the bottom. Horizontal Geologic Formations (with infinite extent). The potentiometric surface is horizontal and is steady prior to pumping. Any changes in potentiometric surfaces are due to pumping . Methods for determining aquifer parameters. In Unit 2 we discussed about various lab and field methods for determining the hydraulic conductivity values for the soil/rocks.. Methods included the use of constant head Permeameter, falling head Permeameter and tracer tests for determining the K..