Summary

Ari Enkin Translation:Shulchan Aruch/Yoreh Deah…

Only if cut with a knife will you have to go back and re-wash, because through the pressure of a knife, blood is brought up to the surface. However, according to the Ran who holds the reason for the washing is to soften the meat, it would make no difference how many cuts are made, and re-washing would not be required. However, halacha follows the opinion that the rinsing is due to blood, therefore re-washing will be required even post facto.
Source: Wikisource

Ari Enkin Translation:Shulchan Aruch/Yoreh Deah…

Rema: An especially smooth surface that water would flow from need not be placed in a slanted position. however if it’s not this smooth it must be placed slanted so that the water flows out. Even in a vessel with holes, one should be careful to make sure the holes are open, therefore it should not be placed on the ground, for then it is as a vessel without holes. As a result of this some people are stringent and place straw or shavings because even the meat can close up the holes.
Source: Wikisource

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