Surface drains
What is surface drain?
These are open drains provided for conveying water from kitchens, bathrooms and rain water to main sewers. These are usually provided at sides of the road and along the boundary line of building. As far as possible drains should not be laid under the buildings. For efficient draining the surface drains should have certain qualities, such as should be laid in such a gradient to develop self-cleaning velocity, should have a reasonable free board at the top, joint should be smooth finished, easy curves, inner surface should be smooth, cheap in construction and maintenance. There are various shapes of surface drains as U-shaped, V-shaped, etc.
