Iron-enhanced sand filters are not designed to discharge a part of the effluent to groundwater nor are they designed to treat all runoff events. The water quality benefit of the iron-enhanced sand filter should only be accrued based on the volume of water that is treated by the BMP.
He immediately followed his initial reports with the announcement that Southwest Airlines is expanding into a new market in May, and that market is the new International Airport in Panama City Florida.
I don't know anything about boat service between the two, so the only suggestion I have is to look for deals on flights, which occur surprisingly frequently in Latin American countries. You can also drive or bus or boat to Panama from Costa Rica and fly from Panama to Colombia. If you don't care about safety, I've heard it's possible to hire Colombian guides and hike across the mountains separating Panama and Colombia.