I used two pieces of 1-meter trench drains (cemented together) cast into concrete, becoming a large inlet for rainwater that comes fast over the wide walkway. Establishing exact relative heights were important at every step during the installation. The step down and width of pour are essentially rise and run of stairs, so those minimum standards were considered. I kept the riser at four inches and gave the run a wide 13 inches.
All top surfaces were troweled with drainage in mind. The trench center was slightly depressed to take water from the ends. This is inlet side of the erosion-control drainage system. Connections embedded in concrete were cemented together. See the outlet side for more information.
At $100, these pieces were the most expensive parts of the system.
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