What is Gauge-Adjusted Radar Rainfall (GARR)?

GARR stands for Gauge-Adjusted Radar Rainfall. It is a product that combines information from both rain gauges and radar to generate an accurate, high-resolution rainfall dataset that is better than either source could produce alone.

A rain gauge network, when properly sited and maintained, can be a valuable tool in providing accurate rainfall information at specific point locations.
But precipitation can be highly variable, even over short distances, making it difficult to fully assess what is happening between the rain gauges. Solely relying on a rain gauge network could mean that the heaviest and most intense rainfall goes unobserved.

That’s where radar comes in.

Radars can detect and estimate precipitation from over 200 kilometers away, offering a high-resolution spatial picture of a rainfall event over a wide area.
But rainfall amounts derived from radars are just an estimation. They are very often biased either too high or low because translating radar reflectivity to rainfall is inexact.

However, by using ground-level data from rain gauges to calibrate a radar’s spatially complete rainfall estimations, GARR can offer a comprehensive, high-resolution, and accurate rainfall dataset in near-real time.

With GARR, emergency and water management teams have better insight into an unfolding rainfall event and can pinpoint exactly where and when action is needed. This improved visibility helps prioritize responses, reduces risks, and empowers teams to act with confidence when it matters most.

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