The integrated design process for ground leveling and layout of rainwater pipe

The optimal design of ground leveling is to find the elevation and slope for ground with minimal volume of filling-digging rock-soil. At the same time, we should consider the balance between filling and digging With the given slope in ground leveling design, the aim of rainwater pipe layout is to calculate the optimal pipe diameter, pipe slope and buried depth to make the investment of layout pipe system minimal. Typically, the design process is stepwise implemented with individual cost minimal. In this paper, we investigate the relationship between ground leveling and layout of rainwater pipe system and propose an integrated design for ground leveling and layout of rainwater pipe network. With the united model, we get a global optimal design scheme with minimal total cost. The illustrated example in last part verifies the efficiency of our design process.