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How to operationalize the metric
Method of data collection and data needed to compute the method:
A clearly observable metric of the lack of water for agriculture is the percent of plants or the percent of all land where plants are wilting due to drought. This metric is most comparable for one specific crop, as one variety may differ from another in when it wilts.
Farmers can also rate the frequency or severity of the wilting in their fields through a participatory rating exercise. See Metric 2 of the Crop Yield Indicator for details.
Unit of analysis:
Limitations regarding estimating and interpreting: