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 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.