Active and passive wound drainage systems and method are provided. The end cover portion is configured to cover the park pawl system and allow access to the components of the park pawl system for assembly or service even as the end cover portion remains attached to the main housing of the transmission. A plug-in API is used to provide support for configuration, design, and run-time interactions between the process engine and a deployed plug-in. The layer of polymer-bound concrete allows the diffusion of water vapor, but does not allow liquid water to penetrate. The washed solid portion is then transferred to a letdown zone, which is at a pressure less than the zone in which the solid portion was collected.