It is suggested that DN 100 pipeline should be used at the inlet and outlet of Pool A, and the outlet pipe of Pool A should be installed in the middle and upper part of Pool A, which is about lower than the water level that Pool A needs to maintain, so that Pool A will not dry up. Install a valve at the entrance of pool A, and adjust the inlet water by adjusting the valve size, so that the inlet water and outlet water can reach a balance, so that pool A will not overflow, pool B and pool C will not dry up, and the power of the pump can be reduced.