Reference for Shabbat 16:13

אלא אסקופת כרמלית נוטל ונותן לכתחלה סוף סוף איסורא מיהא איתא

For we learnt: If there is a water pool and a public road traverses it, if one throws [an object] four cubits therein, he is liable. And what depth constitutes a pool? Less than ten handbreadths. And if there is a pool of water traversed by a public road, and one throws [an object] four cubits therein,<span class="x" onmousemove="('comment',' I.e., it travels four cubits before it alights. ');">¹³</span>

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