Reference for Chullin 213:5

ואיכא דאמרי

R'Papa said: A person may not wash the hands in a dike used for irrigation, because [the water] here does not run directly from the human act;<span class="x" onmousemove="('comment',' The water in the dike is supplied by buckets which a man fills from a river and empties into the dike, and thence it runs off in its courses over fields. It is therefore forbidden to dip the hands in the dike because the power of man has already spent itself at the beginning of the dike and the waters run now of their own impetus.');">³</span>

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