Talmud for Eruvin 8:10

רַבִּי אֱלִיעֶזֶר בֶּן יַעֲקֹב אוֹמֵר, בִּיב שֶׁהוּא קָמוּר אַרְבַּע אַמּוֹת בִּרְשׁוּת הָרַבִּים, שׁוֹפְכִין לְתוֹכוֹ מַיִם בְּשַׁבָּת. וַחֲכָמִים אוֹמְרִים, אֲפִלּוּ גַג אוֹ חָצֵר מֵאָה אַמָּה, לֹא יִשְׁפֹּךְ עַל פִּי הַבִּיב, אֲבָל שׁוֹפֵךְ מִגַּג לְגַג, וְהַמַּיִם יוֹרְדִין לַבִּיב. הֶחָצֵר וְהָאַכְסַדְרָה מִצְטָרְפִין לְאַרְבַּע אַמּוֹת:

R. Eliezer b. Yaakov says: A rut [made for the water spilled out in the courtyard to flow into the public domain], vaulted [a distance of] four by four cubits into the public domain, [four cubits being sufficient to absorb the two sa'ah of water sufficient for a day's use] — water may be spilled into it on Shabbath, [for the water ends and does not go out into the public domain.] The sages say: Even if the roof or the courtyard were a hundred cubits, one may not spill (water directly) onto the rut. [For if he spills the water onto the rut, it flows straight into the public domain, and the onlooker assumes that he spilled it from roof to roof so that the water flows down to the rut. The courtyard and the achsadrah (see 8:4) combine for (the requisite) four cubits. [If there are in the courtyard together with the achsadrah four by four cubits, they combine, and it is permitted to spill water there without making a hole (see 8:9).]

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