River Floods, 1. heavy rainfall or snowmelt during spring, 2. this goes to tributaries and flows into rivers, 3. water level in the river rises quickly, 4. overflows the banks, 5. river floods the areas near the banks, Flash Floods, 1. caused by extremely heavy rainfall over a short period of time, 2. occurs in dry area without enough soil or vegetation, 3. it will prevent water from infiltrating into the ground, 4. most of the rainwater will become surface runoff, Drought, 1. no rain for a long period of time, 2. not much water in the tributaries or streams, 3. river has less water due to less surface runoff, 4. water stores like groundwater dries up, 5. eventually there is no more water in the river

Variations in Rainfall

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