The First Fork is next largest, with a watershed of  or 19.8% of the total. Roaring Run accounts for 5.7% of the total watershed with  and other tributaries are less than 5% of the total.
This passage describes the relative sizes of different watersheds within a larger system. The First Fork is the second largest, accounting for 19.8% of the total area. Roaring Run contributes 5.7%, while other tributaries make up less than 5%.