Rice Terrace Water Budget

Rainfall in, evaporation and seepage out, irrigation to make up the difference.

This is a real budget with real numbers and it produces a genuine surprise, which is how much water a rice system uses. The figure changes how children think about the crop they eat daily.

The page has the calculation frames, regional rainfall figures, and an evaporation estimate method. It also has a scenario where rainfall drops twenty percent, which children then have to solve. Their solutions, shorter season, fewer plots, better sealing, are the same options real farmers have.