Reference for Eruvin 173:9

<big><strong>מתני׳</strong></big> אמת המים שהיא עוברת בחצר אין ממלאין הימנה בשבת אלא אם כן עשו לה מחיצה גבוה י' טפחים בכניסה וביציאה ר' יהודה אומר כותל שעל גבה תידון משום מחיצה

UNLESS IT WAS FURNISHED<span class="x" onmousemove="('comment',' Within its banks.');">²⁴</span> WITH A PARTITION TEN HANDBREADTHS HIGH AT ITS ENTRANCE<span class="x" onmousemove="('comment',' To the courtyard.');">²⁵</span> AND EXIT.<span class="x" onmousemove="('comment',' From it. The walls of the courtyard under which the channel runs, since they were not originally made for the cannot serve as partitions for it.');">²⁶</span>

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