
An add-on for Modern Beta Forge for 1.12.2 (versions 1.8.0.0 or later) which adds river generation for Beta, Alpha, Infdev 20100611, and Pocket Edition terrain generators.
Navigate to the Add-on tab in the world customization GUI, enable river generation, and then tweak several settings to control river generation, including river rarity, depth, depth variation, and width/weight.
The following should be done in the server.properties file: