Question of the day: 1. What are some examples of

local dams and reservoirs? 2.What are the benefits of dams? 3.What are the disadvantages of

dams?

Local examples

Dams and Reservoirs

• Benefits:– Ensure year-round supply

of water with regulated flow

– Generate electricity– Provide recreational

activities• Disadvantages– Alter the ecosystem– Reduce sediment load

Dams and Reservoirs- Problems created by them

• Salmon Population in Columbia River very low due to dams that impede migration

• Fish ladders help, but are not effective enough

Movement of Dam Removal

• http://www.youtube.com/watch?v=H9wJOAtSk6s&safety_mode=true&persist_safety_mode=1&safe=active

Salmon Run Game

Dams and Reservoirs• Glen Canyon Dam

– Regulated flow has changed ecosystem• To rectify situation

– Canyon has been flooded several times– Small floods compared to natural floods– Still helps rebuild habitat

Read pgs. 340-347• Questions: Who is in charge of building dams

in the US?• What was one main reason for the building of

dams? Which rivers/river communities were they trying to protect?

• What is the controversy behind the Meramec Dam? What was a local controversy over dam building?

• Explain our states unique circumstances with the Delaware River Basin.

Questions from pg. 340-347

• Describe how dams provided easier travelling along the river.

• What are the advantages/disadvantages of hydropower?

The plight of the salmon

Delaware River Basin Commission Report on Gas well drilling in the basin

• http://www.phillyburbs.com/news/news_details/article/28/2010/december/10/debate-expected-over-gas-drilling-rules.html