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6.6. CASE: HADRAMAWT IMPROVED TRADITIONAL ENGINEERING. YEMEN. WADI HADRAMAWT. Rainfall isohyets. Hadramawt: special characteristics. Extremely low rainfall (50 mm/year) Very irregular and often heavy floods

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Presentation Transcript
slide2

YEMEN

WADI HADRAMAWT

Rainfall isohyets

hadramawt special characteristics
Hadramawt: special characteristics
  • Extremely low rainfall (50 mm/year)
  • Very irregular and often heavy floods
  • Special efforts to avoid that large floods destroy command area and residential area) much attention for spillways(
  • Groundwater and hence recharge is important
slide5

Al Powirigat Traditional Dyke

Water Master

In many systems the traditionalstructures have been improvedthrough a mix of modern and traditional techniques

special structures
Special structures

Diversion structures

  • Bunds and dykes
  • Traditional abutments
  • Spillways
  • Recharge bunds

Command area structures

  • Water distribution structures
  • Field to field overflow structures
  • Low flow field intakes
diversion structures
DIVERSION STRUCTURES
  • Bunds and dykes
  • Traditional abutments
  • Spillways
  • Recharge bunds
slide11

SPILLWAYWITH

STEPPEDSTONES

AL ROMALYATRADITIONALWEIRREINFORCEDWITH CONCRETE

slide12

FLOOD CHANNEL INTAKE

TRADITIONAL ABUTMENT

BREACH-ABLE EARTHENBUND TO BREAK IN HIGHFLOODS AND RELEASE FLOOD WATER INTO THERIVER

slide16

MOZA SIBHAM DYKE REINFORCED WITH

TRADITIONAL ABUTTMENTS

slide21

TRADITIONAL LOW RECHARGE WEIR

TO SLOW DOWN AND SPREAD FLOODS

command area structures
COMMAND AREA STRUCTURES
  • Water distribution structures
  • Field to field flow structures
  • Low flow field intakes
slide23

WATER DISTRIBUTION:

WATER IS DIVIDED PROPORTIONALLY IN SMALL CHANNELS

slide24

WATER DISTRIBUTION:

GATES USED ON SOME OF THE SMALL CHANNELS

TO CLOSE SUPPLIES AFTER AREA IS SERVED

slide29

UNDERFLOW STRUCTURE TO

CAPTURE VERY SMALL FLOWS

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