Reference for Moed Katan 9:2

אמר ר' יעקב אמר ר' יוחנן לא שנו אלא שאין רבים צריכין להם אבל רבים צריכין להם אפילו חפירה מותר

[That is to say only] to repair, but not to be dug [afresh]. Said R'Jacob as reporting R'Johanan: This was taught only where there is no public need; but where there is public need<span class="x" onmousemove="('comment',' Lit., 'where the public needs them.' Though there be no immediate need for it, yet 'cleaning out' may be done in the festival week.');">²</span>

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