Abstract: A retrofit drainage system for removing excess water from sites having no built-in drainage system. The retrofit drainage system minimizes the risk of pollution in general and specifically avoids environmental spills from disposal equipment, while affording inherent water testing capabilities. The present invention does not use electrical or mechanical engines, but rather utilizes conduits extending between an inlet disposed in a body of excess water and an even lower outlet, therebetween the present invention provides an elevated funnel and funnel valve and shutoff valve for selectively controlling the flow of water from inlet to outlet.