River Generation Dramatically Increased in Default World-Gen.

Comparing worlds generated with 14w17a with worlds made with the same seed in previous versions, there are now a lot more river biomes cutting through the land.

I am not using the customized world gen-option.

I've tried creating several random worlds (again not using the customized world type) and rivers seem to be much more frequent and often crisscross against themselves, causing unrealistic river behavior.