AQTESOLV Tour--Automatic Curve Matching

Match any aquifer test solution objectively and efficiently using automatic curve matching. AQTESOLV uses nonlinear weighted least-squares with singular-value decomposition to determine the optimal match between an aquifer test solution and your data.

	Save time and increase precision when matching complex solutions with multiple type curve families!
	Apply weights to activate or deactivate measurements during estimation!
	Activate or deactivate individual wells to match groups of wells!
	Apply singular-value decomposition to achieve convergence on difficult problems!
	*Select a time window* to perform matching to a selected range of data!

Features
	nonlinear least-squares matching	singular-value decomposition
	match groups of wells	match within time window

Nonlinear Least-Squares Curve Matching

Since its first release in 1989, AQTESOLV has led the way with the integration of visual and automatic curve-matching methods into a single software package for the analysis of aquifer test data.

AQTESOLV employs a powerful method of nonlinear weighted least-squares curve fitting (Marquardt 1963) to find the optimal match between solution curves and aquifer test data.

Singular-Value Decomposition

AQTESOLV now includes singular value decomposition (SVD), a powerful technique that improves the convergence of automatic curve matching (Press et al. 2002). When SVD is invoked, parameter corrections are dampened by eliminating insensitive components from the updating equations. SVD can yield convergence in certain difficult problems where other algorithms may fail.

Match Within Time Window

In some instances, it is advantageous to match an aquifer test solution over a specified range of time. AQTESOLV makes it easy with a time window for automatic estimation.

Choose a time window for automatic curve matching.

Match Group of Wells

AQTESOLV allows you to analyze more than one observation well in pumping tests and slug tests. In the Active Wells properties, you may choose which wells to match during automatic estimation.

Quickly select wells to include or exclude from automatic curve matching.

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