D.C. Code § 1-204.53

(a) In accordance with subsection (b) of this section and except as provided in subsection (c) of this section, the Mayor may reduce amounts appropriated or otherwise made available to independent agencies of the District of Columbia (including the Board of Education) for a fiscal year if the Mayor determines that it is necessary to reduce such amounts to balance the District’s budget for the fiscal year.
(b) (1) The Mayor may not make any reduction pursuant to subsection (a) of this section unless the Mayor submits a proposal to make such a reduction to the Council and the Council approves the proposal.
(2) A proposal submitted by the Mayor under paragraph (1) of this subsection shall be deemed to be approved by the Council:
(A) If no member of the Council files a written objection to the proposal with the Secretary of the Council before the expiration of the 10-day period that begins on the date the Mayor submits the proposal; or
(B) If a member of the Council files such a written objection during the period described in subparagraph (A) of this paragraph, if the Council does not disapprove the proposal prior to the expiration of the 45-day period that begins on the date the member files the written objection.
(3) The periods described in subparagraphs (A) and (B) of paragraph (2) of this subsection shall not include any days which are days of recess for the Council (according to the Council’s rules).
(c) Subsection (a) of this section shall not apply to amounts appropriated or otherwise made available to the Council, the District of Columbia Financial Responsibility and Management Assistance Authority established under § 47-391.01(a) , or the District of Columbia Water and Sewer Authority established pursuant to § 34-2202.02 .