English translation by VSARPJ from Stephen Wright Horn and Kerri L Russell "Semantic roles and case marking in Old Japanese":
It seems [they] are rowing along the canal to harvest reed.

English translation by Vovin from Vovin, Alexander. 2009-2013. A New English Translation Containing the Original Text, Kana Transliteration, Romanization, Glossing and Commentary. Folkestone, UK: Global Oriental Press.:
“(4/5) Until all people in the Great Palace will hear (3) the sound of rudders [of boats] (2) that are heard rowing in the [Nanipa] canal (1) to cut the reeds. (W)”