Title: Theis type curve Author: Andre Lehre Subject: 5 x 9 log cycles for matching w/ drawdown plot Created Date: 1/12/2000 8:55:44 AM

The video presents the Theis (1935) non-steady-state method of pumping test analysis in confined aquifers. It shows how the Theis curve fitting method was used in the past to calculate Transmissivity and Storativity, and how a dynamic Excel spreadsheet can instead be used to determine these values based on real water level measurements.

The Theis (1935) solution (or Theis nonequilibrium method) introduced a groundbreaking tool for determining the hydraulic properties (transmissivity and storativity) of nonleaky confined aquifers. Analysis with the Theis method is performed by matching the Theis type curve to drawdown data plotted as a function of time on double logarithmic axes.

Pumping in an Infinite Confined Aquifer - The Theis Solution Theis (1935) presented an exact analytical solution for the transient drawdown in an infinite uniform confined aquifer (See Fig 1). Fig 1. Radial flow to a well in a horizontal confined aquifer (Freeze and …

Use active type curves for more effective visual matching with variable-rate pumping tests. Use parameter tweaking to perform visual curve matching and sensitivity analysis. Perform visual curve matching prior to automatic estimation to obtain reasonable starting values for …

To solve equation we need initial conditions (ICs) and boundary conditions (BCs) Identify pumping well and observation wells and their conditions (e.g., fully screened). Determine aquifer type and make a quick estimate to predict what you think will happen during pumping test. 4.

2018年1月14日 · Theis type curve. A log-log plot of the well function, W(u), versus the argument u, in which u describes for a confined aquifer the theoretical relationships among observation-well distance, time since pumping began, and the aquifer storativity coefficient and transmissivity .

14.2.1 Theis Type-Curve Method. It is a graphical method for analyzing time-drawdown data. In this method, the field-data curve is matched with the standard curve known as Theis type curve (Fig. 14.1) and then the hydraulic parameters of confined aquifers viz., T and S can be determined using the Theis equation [Eqn. (11.8)] as follows:

Theis type curve solution Reading: Fetter, pp. 166-177. Non steady-state flow to a fully confined well. Graphical solutions to flow equations: Theis type curve method, (Cooper) Jacob time drawdown and distance drawdown methods. Introduction: - Previous emphasis: Predicting drawdown based on known aquifer parameters. Examples:

This is the type curve matching solution to the Theis (1935) equation. The Theis equation describes unsteady-state (or transient) flow in a confined aquifer. The Theis equation is given as: where: and: The Theis type curve is displayed on the …