The trapezoidal concrete pond has a height of 160 cm, a longer base length of 3 cm and shorter base length of 1.7 cm; the total thickness of the substrate layer is 80 cm, and there is a 40 cm thick soil layer on the top of the substrate layer. The influent reservoir baffle has a height of 140 cm and the influent sediment pond baffle has a height of 120 cm. A large gravels layer stands beneath the influent sediment pond baffle, and there is a portion of connectivity between the influent channel and the large gravel layer. The effluent sediment pond baffle has a height of 100 cm and
the effluent reservoir baffle has a height of 80 cm.