Akva

What Akva does

Columns matched by name

Import analyses from CSV, tab-separated files or SQLite. Columns are found by name, not by position, so the order does not matter and extra columns are ignored. A blank or non-numeric cell is reported as missing rather than guessed at.

The ion balance first

The charge balance error is computed from the eight major ions in meq/l, against the tolerance you set. A sample outside it stays in the table but can be left out of the aggregates and the diagrams.

Water type, facies and irrigation indices

Each analysis is named by its dominant cation and anion and by its Piper facies, and scored with SAR, Na %, RSC, the Kelly ratio, magnesium hazard, permeability index, hardness and — with conductivity — the USSL class.

Aggregate by point or category

Earliest, latest, minimum, maximum, mean or median, so you can ask what a spring is like rather than what one bottle was like. Each aggregate says how many samples it came from.

Piper, Schoeller and USSL diagrams

The three diagrams hydrochemists expect, each available as a quick result that builds the plot and the analysis behind it in one step. Export to SVG, HTML or image formats.

Samples next to model results

Plot field samples and PHREEQC results in the same figure, so calibration is a visual check instead of a spreadsheet exercise.

Typical uses

• Screen a sampling campaign for analyses that do not balance
• Classify groundwater by hydrochemical facies
• Judge irrigation suitability on the USSL diagram
• Prepare measured data for PHREEQC calibration