Government, lay before the Board a supplementary Budget and the provisions of section 22 and 23 shall apply to such Budget.

The Board may, at any time, vary any Housing Scheme Variation of orany part thereof included in the Budget as sanctioned Housing by the State Government: Scheme by

Provided that no such variation shall be made the Board if it involves expenditure in excess of 10 per cent of after it has the amount as originally sanctioned for the execution been sanc- of that particular housing scheme included in the tioned.