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When is a person liable for damage caused by water he released? The shiur builds a fundamental chakira: liability requires either one's direct force (koach rishon) or one's ongoing action (ma'aseh). Pouring water (pote'ach mayim) creates force only initially, while diverting water (heitze'iv/hifnah) makes the entire flow one's action—a distinction the Rambam (רמב"ם) encodes across Hilchos Chovel U'Mazik, Rotze'ach, and Shechitah.
This shiur provides an in-depth analysis of the Gemara (גמרא)'s discussion of koach rishon (first force) versus koach sheini (second force) in the context of liability for damages, particularly focusing on the case of poter mayim (releasing water). The fundamental question is: when is a person held liable for damage or death caused indirectly through water he released? Rabbi Zweig begins by examining the Chazon Ish's question on the concept of grama b'ama (indirect causation that nevertheless creates liability). The Chazon Ish in Bava Kamma asks: if moving a concealed object to an exposed place where an animal then damages it is considered the person's action (not grama), why is releasing water considered grama when the person didn't act directly on the water itself? The Chazon Ish answers that there's a fundamental distinction: when you physically move the object, you performed a ma'aseh (action) on the object itself, but when you release water, you're not acting directly on the water—you're merely removing an obstacle. The Chazon Ish further distinguishes between two understandings of koach sheini: is it the second water that comes out, or the first water that reaches a second location? He argues that the first water in the second place is considered your action (yormaisa), but the second water in the first place is merely groma.
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Bava Kamma 4b
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