Yosef Karo

“ What are we talking about? When a yard is adjacent to the public domain, but if it is adjacent to the karmelit, even if it is tiny, it doesn't need a pit even in the summer (and see below chapter 377) . ”

“ Every pit that is one half amah by one half amah and three-fifths amah deep can hold two seah (Ramba"m) . This is true whether he makes the pit in the yard or outside. If he makes it outside, he must cover it with boards to make it a place of exemption, and therefore the water will be falling from his hand to a place of exemption. Once he makes the pit, he can pour as much as he wants in. If it doesn't hold two seahs, he may not pour anything. ”