Guide School - Basic Hydrology Quiz This form is used to gauge the student's basic understanding of hydrology and river features. An Advanced Hydrology Quiz will follow. Name* First Last Email* A rapid of any difficulty rating consists of 3 parts; without any one of them, a rapid cannot exist. Name the three parts and how changing quantities can make a rapid more or less difficult.*According to the International Scale of River Difficulty, there are 6 classes of rapids. Describe the differences between class 2 and 3, and between a class 3 and 4 rapid.*If this wasn't covered in Guide School, give your best attempt to answer the question. Name 5 different "features" you may find on a class 3 river?*Describe an "eddy". From up above, what direction does the water appear to be moving in an eddy? Why does this matter to you as a paddler?*Describe the difference between a wave and a hole. Which is more problematic and why?*Describe the difference between an eddy and an eddy line.*Do you have any questions on Basic River Hydrology the instructor(s) can address tomorrow?*EmailThis field is for validation purposes and should be left unchanged.