The "five sons" in Sixty Jiazi Yinna's Five Lines belong to the five elements of fire (thunder and fire); But according to the positive five elements, water belongs to Pentecostal, and water belongs to Pentecostal, which is the water of heavenly stems and earthly branches on Pentecostal.

Wei Kun is the Eight Diagrams (Eight Palaces) and Twenty-four Mountains (Twenty-four Directions) in geomantic omen, belonging to Kun Palace in the southwest, and its five elements "Wei" and "Kun" belong to the earth.

I don't know where you come from. In a word: it should refer to Tuk water. Because Wu He is dirt, only Zi is water.