regulation of cascade reservoir

例句：

1. 1.The cascade of leaves on the trees is breathtaking.
   树木上树叶的层叠美景令人叹为观止。
2. 2.The cascade of water from the mountain falls into the river below.
   从山上流下的水汇入下面的河中。
3. 3.The cascade of flowers in the garden was a sight to behold.
   花园中花朵的层层绽放是一道美丽的风景线。