Estimating confined aquifer parameters using a simple derivative-based method

Simulation of Seawater Intrusion in Coastal Confined Aquifer Using a Point Collocation Method Based Meshfree Model

Seawater intrusion caused by groundwater over-exploitation from coastal aquifers poses a severe problem in many regions. Formulation of proper pumping strategy using a simulation model can assure sustainable supply of fresh water from the coastal aquifers. The focus of the present study is on the development of a numerical model based on Meshfree (MFree) method to study the seawater intrusion p...

Estimating Streambed and Aquifer Parameters from a Stream/Aquifer Analysis Test

The Tamarack State Wildlife Area in eastern Colorado is being investigated as a possible managed recharge project to redirect flows in the South Platte River for water quantity management. Two primary surface water/groundwater interactions exist at Tamarack: (1) between the South Platte River and alluvial aquifer and (2) between backwater sloughs, or secondary river channels, and the alluvial a...

An EXCEL Tool for Teaching Theis Method of Estimating Aquifer Parameters

Hydraulic conductivity and storage coefficient of aquifers are often estimated from nonequilibrium well pumping test data using Theis method. This method requires matching a typecurve with time-drawdown data curve from a pumping well. Typically, this is done by using a type-curve plotted on a graph paper and the data curve plotted on another transparent graph paper, and superimposing and slidin...

A simple method for estimating relative risk using logistic regression

BACKGROUND Odds ratios (OR) significantly overestimate associations between risk factors and common outcomes. The estimation of relative risks (RR) or prevalence ratios (PR) has represented a statistical challenge in multivariate analysis and, furthermore, some researchers do not have access to the available methods. OBJECTIVE To propose and evaluate a new method for estimating RR and PR by l...

Simple method for estimating trypsin.