City Sanitation Plan, Uttarakhand Detailed Plan report, Muni Ki Reti 1

City Sanitation Plan, Uttarakhand
6. Wheel Holes
Weep holes have to be spaced at 1.5 meter horizontally and vertically and should be size 8X 5cm
having dry brick ballast 20x20x30cm padding.
7. Drain Section
Normally the specification for drain should be 1:6:12 cement concrete with brick ballast 8 cm thick at
bottom and brick on the edge flooring in cement mortar 1:6 the sides should be of dry on edge, at the
top bull nosed bricks in cement mortar 1:6 have to be provided. Flush pointing to be done with
cement mortar 1:3.
8. Drop in Bed
When a branch drain joins a main drain the discharge in the main drain or the bed of shape of a drain
changes from steeper to flatter at any section the size of the drain after that section has to be made
bigger. In case where the depth is increased to provide larger of flow then care should be taken that
the highest flood level on out going drain should remain lower or at the most same as the maximum
highest flood level of the incoming drain or otherwise a vertical drop in the bed of the drain has to be
provided. A vertical drop up to 4 cm should be accomplished by giving steps in the brick pitching
itself. The bed and sides of the drain 30 cm up stream and 60 cm down stream of the drop should be
provided with half brick masonry in cement mortar. In cases where drop is more than 4 cm, it should
be provided by constructing vertical masonry wall
9. Change in Velocity
The change in velocity inside the drain should not occur abruptly. For every increase in velocity by
0.3 meter per second the distance along the drain should be 4.5 metre.
10. Fall of a Branch Drain in to Main Drain
Where the fall from a branch drain to a main drain is above 15 cm 4cm cement concrete flooring over
10 cm. Lean concrete should be provided in the main drain bed in length equal to the width of water
surface in the branch drain plus 30cm.
The bed and side of the drain on up stream side of any culvert should be provided with half brick
masonry in cement mortar 1:4 for at least 1 meter length and the side plastered with cement mortar
Detailed Plan report, Muni Ki Reti
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