An irrigation canal turnout into a pond field; an interplot spillway, allowing water to spill from a pond field into one below.
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For someone (agent muɴ-) to unblock an irrigation canal turnout into a pond field, an interplot spillway or water (theme i-), to allow it to flow into a pond field.
For someone (agent; s agent maN-) to construct an irrigation canal turnout (theme) or an interplot spillway (theme) in an irrigation canal or pond field wall (loc ref -an), to allow water to flow into a pond field.