D.C. Mun. Regs. tit. 30, § 941
941.1 The prize pool for all prize categories shall consist of fifty percent (50%) of each drawing period's sales, including tax, after the prize reserve accounts are funded consistent with all agreements in place governing the conduct of Hot Lotto.
941.2 The prize money allocated to the Grand Prize category shall be awarded equally to the number of game boards winning a Grand Prize.
941.3 Any amount remaining in the prize pool at the end of each game shall be carried forward to a replacement game or expended in a manner consistent with all agreements in place governing the conduct of Hot Lotto and in accordance with District law.
941.4 An amount equal to up to one percent (1%) of sales, including tax, shall be placed in trust in one or more prize reserve accounts until the prize reserve accounts reach amounts designated pursuant to agreements governing the conduct of Hot Lotto. Once the prize reserve accounts exceed the designated amounts, the excess shall become part of the Grand Prize pool.
SOURCE: Final Rulemaking published at 51 DCR 2400 (March 5, 2004).