1. Vertical and horizontal drainage on the back and side ditches of various retaining walls of expressway;
2. Drainage of tunnels and underground tunnels;
3. Water supply and drainage of municipal works, water purification plants, sewage plants, garbage dumps, etc.
4. Drainage of golf courses, stadiums, parks and other recreational green spaces;
5. Developing slope soil and water conservation on hillside;
6. Underground drainage of land preparation works;
Cast iron drain pipe is suitable for pavement structure with waterproof layer. The lower end of the pipe should extend at least 0.15-0.20 m below the bottom of the lane board to prevent seepage on the rib surface of the main girder.
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