The earth gods at Shui-t'ou Fu-teh Temple are responsible for ensuring that the paddy fields have adequate sources of irrigation, a duty that fits in with a Hakka saying that the earth god "holds the mouth of the water."
水頭福德祠，顧名思義，其實就是負責鎮守水田源頭，頗符合客家人所謂土地公「把水口」的說法。