Module 2 (part 2)
description
Transcript of Module 2 (part 2)
Initial layout for Al Mossefiyah Intake
Wadi
flow
Gabion wall
Al Mossefiyah canal
Another canal
Curved gabion wall
Gabion wall to restrict intake opening size
Width ~100m
Suggested layout for Al Mossefiyah Intake Possible bed bar
if acceptable to downstream
users
Gravel embankment to
be constructed by farmers
Gabion wall designed as spillway
Intake structure with orifice
Wadi bank
Obar Fareed (Wadi Tuban)
Armoured head of intake
Spillway
Head regulator
Obar Al Sadain – Wadi Tuban
Bed bar
Armoured head of intake
Spillway
Head regulator
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)
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
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
Skimming weir
Skimming weir constructed in front of head regulator. However, water is needed
for flushing
Sediment in canal
Gravel in canal reduced, but not avoided
The end of module 2
Thank you