Table of Contents
CHARACTERISTICS OF INUNDATION CANALS
- Inundation canals are mostly used in deltic and alluvial regions of the river.
- As river course here is generally at a higher level and the course is maintained between dykes or embankments.
- The section of the canal is not regular.
- The banks are not very strong and may breach if not properly looked after.
- These canals have longitudinal, slopes varying from 25 cm to as much as 1 m per kilometer length.
- Depth of the canal maybe 1.5 m to 3.5 m.
- Like regular canal system inundation canal system may also have the main canal and then smaller canals.
- The bed level of these canals should be kept at the most at the level of minimum water level in the river.
- Lower the bed level of the canal, more will be the time for which water will remain available.
- An inundation canal may be provided with two or three heads.
- It is done that if one head is washed away water may be taken from the other head.
- The head reach of the canal may extend to several kilometers.
- At the end of the head reach, a flood regulator is constructed.
- An escape should be provided near the regulator, so that if more water gets entered into the canal.
- It may be taken out and discharged into the river D/S.
- A lot of silt is deposited in the canals and as such silt clearance should be done after every flood.