Use a Tee on the inlet with 5 foot long sections to lay flat on the bottom...For a 6 inch pipe or larger, you should drill 3 inch holes to allow leaf debris to easily flow in. You can cap and drill the ends of the Tee'd pipes, or I use expanded aluminum mesh. The larger holes will not clog..1 inch holes will clog with leaves. The larger holes and the TEE do not allow larger branches to get in the siphon that will get caught in the pipe bends (if something can get past a 90 degree angle, it will get expelled at the outlet)