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.
A dam can also be used to collect water or for storage of water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees (also known as dikes) are used to manage or prevent water flow into specific land regions.