A cross drainage work is a structure carrying the discharge from a natural stream across a canal intercepting the stream. Canal comes across obstructions like rivers, natural drains and other canals. The various types of structures that are built to carry the canal water across the above mentioned obstructions or vice versa are called cross drainage works. It is generally a very costly item and should be avoided by:
- Diverting one stream into another.
- Changing the alignment of the canal so that it crosses below the junction of two streams.
Types of cross drainage works
Depending upon levels and discharge, it may be of the following types:
- Type – 1: Cross drainage work carrying canal over the drain.
- Type – 2: Cross Drainage work carrying Drainage over the canal.
- Type –3: Cross drainage works admitting canal water into the canal.
- Type – 1: Canal over drainage [HFL < FSL]