What is the ruling concerning the maintenance of a shared well or river?

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Each co-owner has the right to contribute to the maintenance of a shared well or river. If one owner contributes, they cannot prevent the other owner from taking their allotted share of the water. This is because the water originates from their shared property, and the contributing owner's effort is limited to removing silt, not investing in the water source itself, resembling the case where one owner builds a shared wall using their own materials.