In addition, rates will differ based on how often you want pros to clean. Generally, the more times a house cleaner comes in a month, the lower the price per visit, though this is often a matter of $5 or $10 per clean. Some cleaners offer a discount if homeowners are willing to pay for multiple visits upfront, or if they sign a long-term contract.
In 1903, the newly-independent Panama sold the rights to the canal to the U.S. for $10 million. The U.S. military had a strong presence in the Panama Canal Zone until 1999, when all U.S. military bases were closed. The canal is still used for the transportation of military water vessels.
Two of the most prolific uses for rivers are power generation and irrigation. Hydroelectric dams use rivers to spin turbines that are connected to generators, and nuclear power plants use a constant flow of river water to help cool reactors. River water is also pumped into farms and nurseries to irrigate crops and other vegetation and is used to develop and irrigate previously arid locations.