Official Rule: The DMG p.303 state that falling damage is d6 per 10 foot increment to a maximum of 20D6.
House Rule: The DMG p.303 rule still applies, the only difference is that there is no maximum damage.
As per Dragon Magazine 327, a character will fall 500 feet the first round of falling, the second round round will fall 850 feet, any subsequent rounds a character will fall 1200 feet.
For example, Lidia falls 350 feet, under the official rule; she would get 20D6 of damage, under the house rule she would get 35D6 of damage.
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