Case hadramawt improved traditional engineering
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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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CASE: HADRAMAWT IMPROVED TRADITIONAL ENGINEERING

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Case hadramawt improved traditional engineering

6.6

CASE: HADRAMAWT IMPROVED TRADITIONAL ENGINEERING


Case hadramawt improved traditional engineering

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


Case hadramawt improved traditional engineering

MANY LARGE FARMER-BUILT STRUCTURES IN HADRAMAWT


Case hadramawt improved traditional engineering

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


Case hadramawt improved traditional engineering

Traditional dyke at Hadramaut


Case hadramawt improved traditional engineering

Traditional diversion dyke – at angle with the flow of the river


Case hadramawt improved traditional engineering

TRADITIONAL DYKE: SPILLWAY/ OVERFLOW


Case hadramawt improved traditional engineering

SPILLWAYWITH

STEPPEDSTONES

AL ROMALYATRADITIONALWEIRREINFORCEDWITH CONCRETE


Case hadramawt improved traditional engineering

FLOOD CHANNEL INTAKE

TRADITIONAL ABUTMENT

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


Case hadramawt improved traditional engineering

TRADITIONAL ABUTMENT


Case hadramawt improved traditional engineering

LIME MORTAR STRUCTURES


Case hadramawt improved traditional engineering

TRADITIONAL INTAKE IN HADRAMUAT


Case hadramawt improved traditional engineering

MOZA SIBHAM DYKE REINFORCED WITH

TRADITIONAL ABUTTMENTS


Case hadramawt improved traditional engineering

MODERN ABUTMENT FOLLOWING TRADITIONAL DESIGN


Case hadramawt improved traditional engineering

COMBINED GABION SPILLWAY WITH TRADITIONAL ABUTTMENT


Case hadramawt improved traditional engineering

GABION SPILLWAY


Case hadramawt improved traditional engineering

Gabion spillway and traditional intake at gar-Sudan area (at wadi Dowan)Hadramawt


Case hadramawt improved traditional engineering

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


Case hadramawt improved traditional engineering

WATER DISTRIBUTION:

WATER IS DIVIDED PROPORTIONALLY IN SMALL CHANNELS


Case hadramawt improved traditional engineering

WATER DISTRIBUTION:

GATES USED ON SOME OF THE SMALL CHANNELS

TO CLOSE SUPPLIES AFTER AREA IS SERVED


Case hadramawt improved traditional engineering

FIELD OVERFLOW STRUCTURE


Case hadramawt improved traditional engineering

FIELD TO FIELD FLOW STRUCTURES (SPILLWAY)


Case hadramawt improved traditional engineering

FIELD OUTLET STRUCTURE


Case hadramawt improved traditional engineering

FIELD TO FIELD FLOW STRUCTURE

(INLET OR OUTLET


Case hadramawt improved traditional engineering

UNDERFLOW STRUCTURE TO

CAPTURE VERY SMALL FLOWS


Case hadramawt improved traditional engineering

FIELD SYPHON FOR FIELDSHIGH ABUTMENT


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