Mesorat%20hashas for Mikvaot 5:3

מַעְיָן שֶׁהוּא מָשׁוּךְ כְּנָדָל, רִבָּה עָלָיו וְהִמְשִׁיכוֹ, הֲרֵי הוּא כְמוֹ שֶׁהָיָה. הָיָה עוֹמֵד וְרִבָּה עָלָיו וְהִמְשִׁיכוֹ, שָׁוֶה לְמִקְוֶה לְטַהֵר בְּאַשְׁבֹּרֶן, וּלְמַעְיָן לְהַטְבִּיל בּוֹ בְּכָל שֶׁהוּא:

A spring that flows like a centipede [i.e. with many smaller tributaries], if one added [drawn waters] upon it and it continued flowing, it is thereby [still] as it was. If it [the spring's water] was standing, and one added [drawn waters] upon it and it continued flowing, it is equivalent to a <i>mikveh</i> in that it purifies [only] while gathered in one place, and to a spring in that one can immerse [objects] in it in any amount [of water].

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