sentences:  These changes, coupled with an increase of impermeable surface in the watershed has caused an increase in peak runoff levels, flooding and erosion of deeply incised channels up to deep.Most of the upper watershed is protected by San Pedro Valley County Park a park which has three perennial creeks, the south and middle forks of San Pedro Creek, and Brooks Creek.During the rainy, winter months, a special attraction is the beautiful Brooks Falls, which has a drop of in three tiers.