10. Slum Level physical works - storm drainage

There is a common misconception that underground storm drainage is more expensive than open drains. As seen below, well designed piped drain can be cheaper.

ItemPiped Storm Drain (Rs. Per 100 m)Open Storm Drain (Rs. Per 100m)
Excavation17011302
Pipe17700-
Chambers6000-
Concrete (1:4:8)-8600
Brickwork-14880
12mm Plaster-5520
Total25,401 (£ 466)30,302 (£ 532)