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Trenchify trench drain can be pre-sloped or flat. All varieties are available in flat, however not all make and models do. The bottom of the Trenchify trench drain channel has the same depth on both ends of the run in a flat trench drain. Water will naturally flow to the outlet. Preloped refers to the fact that as the run continues, the bottom of the trench drain gradually gets deeper. As a result, the water can flow to the outflow by going downhill. Each channel in the trench drain run is made differently as a result to achieve this. Each channel has a number between 1 the shallowest and 10 on it or 25 or 30 or 40 depending on manufacturer and style.