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 waste weir provides a means of removing excess water from the canal, and provides a means of draining a section of the canal for repairs, for winter, or in anticipation of flooding. Because rising canal waters could overflow the banks, eroding them and causing a break in the canal, waste weirs were an important safety feature of early canals.