Mesorat%20hashas for Mikvaot 4:4

מַיִם שְׁאוּבִין וּמֵי גְשָׁמִים שֶׁנִּתְעָרְבוּ בֶחָצֵר, וּבָעֻקָּה, וְעַל מַעֲלוֹת הַמְּעָרָה, אִם רֹב מִן הַכָּשֵׁר, כָּשֵׁר. וְאִם רֹב מִן הַפָּסוּל, פָּסוּל. מֶחֱצָה לְמֶחֱצָה, פָּסוּל. אֵימָתַי, בִּזְמַן שֶׁמִּתְעָרְבִין עַד שֶׁלֹּא יַגִּיעוּ לַמִּקְוֶה. הָיוּ מְקַלְּחִין בְּתוֹךְ הַמַּיִם, אִם יָדוּעַ שֶׁנָּפַל לְתוֹכוֹ אַרְבָּעִים סְאָה מַיִם כְּשֵׁרִים, עַד שֶׁלֹּא יָרַד לְתוֹכוֹ שְׁלשָׁה לֻגִּין מַיִם שְׁאוּבִין, כָּשֵׁר. וְאִם לָאו, פָּסוּל:

Drawn water and rainwater that mixed in a courtyard, or in a hole, or on the upper steps of a cavern [and from there flowed into a <i>mikveh</i>], if the majority [of the water in the <i>mikveh</i>] is from the valid [waters], it is valid; if the majority is from the invalid, it is invalid; if it is half and half, it is invalid. When is this the case? At a time when they mix before they arrive at the <i>mikveh</i>. If they are flowing into the waters [of the <i>mikveh</i> directly, rather than first mixing together], if it is known that forty <i>se'ah</i> [a specific unit of volume] of valid water fell into it before three <i>log</i> [a specific measure of volume] of drawn water, it is valid; and if not, it is invalid.

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