Section 40(2)(h) in The Punjab Scheduled Roads and Controlled Areas Restriction of Unregulated Development Rules, 1965
(h)the levels of the site and of the plinth of the buildings in relation to those of the neighbouring streets, also the levels of all courtyards and open spaces in relation to the bed levels of the existing drains and sewers in the street or streets into which the building or site is to be drained; and