48.4.4. Design Criteria

Try these first

1. 1.

   What defines a semi-modular outlet?

   Hint

   Think about how these outlets differ from others in controlling discharge.

2. 2.

   What is the importance of crest height in semi-modular outlets?

   Hint

   Consider what could happen if the crest is too low.

3. 3.

   What is a characteristic feature of semi-modular outlets?

   • They depend on both canal and watercourse levels
   • They operate independently of the watercourse level
   • They are the most complex type of outlet

   Hint

   Consider which types of outlets maintain independence.

4. 4.

   True or False: The crest height of a semi-modular outlet is crucial for controlling backflow.

   • True
   • False

   Hint

   Think about what happens when the water level rises behind the outlet.

5. 5.

   Design a semi-modular outlet for a hilly terrain. Explain how you'd address crest height and energy dissipation.

   Hint

   Consider how the terrain affects water flow.

6. 6.

   Analyze a failed irrigation project that used non-compliant semi-modular outlets. Identify and explain at least three issues caused by improper design.

   Hint

   Reflect on how the lack of design criteria could have affected the farmers.