Marsh Drainage

Marsh Drainage is a form of Technology and Culture.

Description
Much otherwise useful flat land is too water logged to allow farming or grazing. Although it is very labor intensive, it is possible to construct drainage works to control water flow into and out of a marsh, and thus convert it into a fertile plain that can be farmed or used for grazing flocks.

Effects

 * Enables Terrain Improvements: Drain Marshes