When I saw your question, the first thing I thought of was using water pipes to divert the water.
Solution: You can combine water pipe drainage and hand pump. After this prompt, what do you think?
If draining water pipes makes absorbing water painful, you can use your hand to pump the water to absorb the water for you. Specific operation method: 1. If the diameter of the water pipe for drainage is relatively large, you must first block the lower end of the water pipe for drainage (to ensure that the water level at this end is low), then lift the cave end (to ensure the water level at this end is high), use a hand pump to fill the water pipe with water (this that is, the water pipe drains and absorbs water after the water pipe is filled). The water, of course, is blocked then placed in the cave. This solves the problem of water pipe drainage and water absorption. 2. If the diameter of the water pipe for drainage is relatively small, directly connect the drainage pipe to the outlet of the hand-pressurized water pump, and use the hand-pressed water pump to suck the water into the drainage pipe when there is one. water flowing from the lower end of the drainage pipe, block it (make sure the end is at low water level). At this time, you can stop the operation of the hand-pressed water pump and remove the drainage pipe from the). the outlet of the water pump squeezed by hand (to ensure a high water level at this end). Of course, block it then place it in the cave. This will solve the problem of water pipe drainage and water absorption.
If the water absorption problem is solved, then your problem is solved too!