Q1: If the peak discharge of a storm water drain (S.W. Drain) is e.xpected to exceed 150 cumecs, the free board to be provided, is

ANS:A - 100 cm

When designing stormwater drains, it's essential to provide adequate freeboard to accommodate peak discharge and prevent overflow during storm events. Freeboard is the vertical distance between the water level and the top edge of the drain or channel. For stormwater drains where the peak discharge is expected to exceed 150 cumecs, a freeboard of 100 cm (or 1 meter) is typically recommended. This ensures that the drain has sufficient capacity to handle the peak flow without overflowing and causing flooding or damage to adjacent properties and infrastructure. Therefore, the correct option is: a. 100 cm