1. Improving Diversion Works
Module 2 (part 2)
Improving Diversion Works
John Ratsey

2. Initial layout for Al Mossefiyah Intake
Another canal
Curved gabion wall
Width ~100m
Gabion wall
Wadi
flow
Gabion wall to restrict intake opening size
Al Mossefiyah canal

3. Suggested layout for Al Mossefiyah Intake
Possible bed bar if acceptable to downstream users
Gabion wall designed as spillway
Intake structure with orifice
Gravel embankment to be constructed by farmers
Wadi bank

4. Obar Fareed (Wadi Tuban)
Spillway
Head regulator
Armoured head of intake

5. Obar Al Sadain – Wadi Tuban
Head regulator
Spillway
Bed bar
Armoured head of intake

6. Economics Building flood resistant structures can be expensive
The benefits, from reduced maintenance work and improved crops, may be moderate
Functional requirements may be changed after 25 or 50 years (higher command levels, even fewer floods)

7. Improvements to modern intakes
Works to improve sediment removal
Eg. skimming weir in front of intake
Removal of divide wall
Works to improve hydraulic performance and flow division
Weir crest raising to restore command
Works to help flow management

8. Waqar weir
The trash floating down the wadi cannot turn over the weir and goes straight to the intake. Difficult to fix, but note for future designs

9. Skimming weir
Skimming weir constructed in front of head regulator. However, water is needed for flushing

10. Gravel in canal reduced, but not avoided
Sediment in canal
Gravel in canal reduced, but not avoided

11. The end of module 2
Thank you