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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

6.6

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



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





SPILLWAY riverWITH

STEPPEDSTONES

AL ROMALYATRADITIONALWEIRREINFORCEDWITH CONCRETE


FLOOD CHANNEL riverINTAKE

TRADITIONAL ABUTMENT

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




TRADITIONAL INTAKE riverIN HADRAMUAT


MOZA SIBHAM DYKE REINFORCED WITH river

TRADITIONAL ABUTTMENTS






TRADITIONAL LOW RECHARGE WEIR (at wadi Dowan)

TO SLOW DOWN AND SPREAD FLOODS


Command area structures
COMMAND AREA STRUCTURES (at wadi Dowan)

  • Water distribution structures

  • Field to field flow structures

  • Low flow field intakes


WATER DISTRIBUTION: (at wadi Dowan)

WATER IS DIVIDED PROPORTIONALLY IN SMALL CHANNELS


WATER DISTRIBUTION: (at wadi Dowan)

GATES USED ON SOME OF THE SMALL CHANNELS

TO CLOSE SUPPLIES AFTER AREA IS SERVED


FIELD OVERFLOW STRUCTUR (at wadi Dowan)E


FIELD TO FIELD FLOW STRUCTURE (at wadi Dowan)S (SPILLWAY)


FIELD (at wadi Dowan)OUTLET STRUCTURE


FIELD TO FIELD FLOW STRUCTURE (at wadi Dowan)

(INLET OR OUTLET


UNDERFLOW STRUCTURE TO (at wadi Dowan)

CAPTURE VERY SMALL FLOWS


FIELD SYPHON FOR FIELD (at wadi Dowan)SHIGH ABUTMENT


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