How must the trenches in a recirculating design be connected?

In a recirculating design for septic systems, connecting the trenches at both ends ensures equal distribution of effluent. This connection allows the system to maintain a balanced flow across the entire trench network, which is critical for the efficient treatment of wastewater. By having both ends connected, the system can effectively circulate the effluent, preventing over-saturation in any single trench and promoting even soil loading. This method reduces the risk of clogging and optimizes the performance of the drainage field, ultimately enhancing the longevity and effectiveness of the septic system.

Other options may suggest different approaches, but they do not provide the same level of efficiency and balance in distribution necessary for a successful recirculating septic system design.