5. Hydroelectric power facilities are useful ways of generating renewable energies. Within a dam the water is walled off and creates a reservoir behind a river. Water is released from the reservoir and it flows downwards as it passes through turbines to generate electricity. The hydrostatic force of the reservoir acting on the dam wall is important to know when designing the system. Due to the linear nature of the pressure acting on the dam wall we can assume that the pressure acting on the entire wall is the midpoint of the dam (i.e. half way down the height of the dam). While hydroelectric power is praised for its low carbon footprint, it often has adverse effects to local communities who have considered the river basin home for hundreds or thousands of years. Within North Dakota we have the fifth largest earthen dam, built in 1947. The building of this dam displaced 80% of the Mandan Hidatsa Arikara (MHA) Nation's population from the fertile lands of the river valley to the rockier lands higher in elevation on the North end of the MHA Nation. Use this resource to learn about the effects of the Garrison Dam on the MHA Nation. You are only required to go through the first sections and you can stop when you reach the section titled: "Sovereignty and Oil at Fort Berthold". a. The Garrison dam is 210 feet high and 11,300 feet wide, what is the force (in psi) acting on the dam wall? Remember to account for atmospheric pressure. b. Use the interactive map to determine what communities (indicated in yellow) were flooded due to the creation of Lake Sakakawea from the building of the Garrison Dam.

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5. Hydroelectric power facilities are useful ways of generating renewable energies. Within a dam the water is walled off and creates a reservoir behind a river. Water is released from the reservoir and it flows downwards as it passes through turbines to generate electricity. The hydrostatic force of the reservoir actin