There should be a brass drain plug on lower face of the pump. Also a drain valve on the bottom of the tank.
The hose to the lake needs to be removed from the lake and drained. There should be a coupling in the hose that can be disconnected so that water will drain from the pump down to that point. The lower section can then be pulled for the lake, it will have a check valve on the end with a strainer. Take this end uphill so all the water drains out of this section. Cover the uncoupled hose ends with cloth and twine keeping the mice out.
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