What is water logging and how to prevent it||by civil Engineering

An agricultural land is said to be waterlogged, when its productivity gets affected by the high water

table.

* Wherever there is waterlogging, there will be salinity of soil also.

* If water table is more than 3 m, there is no danger of waterlogging.

* For reclaiming waterlogged area leaching followed by growing salt resistant crops like fodder,

berseem, bajra for one or two seasons is necessary.

* To remove excess rainwater or excess irrigation water drains are constructed. Types of drains are:

1. Surface drains

(a) Shallow surface drains

(b) Deep surface drains

2. Sub-surface drains or tile drainage.

* Suitable inlet and outlet arrangement are necessary for drains.

Rivers Training

The river training works serve the following objectives:

1. To prevent the river from changing its course

2. To prevent flooding of the surrounding

3. To protect river banks

4. To ensure effective disposal of sediment

5. To provide minimum water depth for navigation.

* River training works may be classified as

1. Training for discharge

2. Training for depth

3. Training for sediment

* Methods of river training, including bank protection are:

1. Marginal embankment or levees.

2. Guide banks

3. Groynes or spurs

4. Artificial cut-offs

5. Pitching of banks

6. Pitched islands