Karkheh Irrigation & Drainage Projects,

Feasibility Studies and Detailed Design of Gravitational Water Offtake and Conveyance to Azadegan and south Karkheh Lands.

Client:
Khuzestan Water and Power Authority

Contractors:

>  Kosaran Pars Institute (MC1 canal and EMD drain)
>  Islamic Revolution Housing Foundation of Khuzestan Province (AMC Canal Reach I)
>  Pars Garma Constructional and Industrial Institute (AMC Canal Reach II)
>  Javadolaemeh Institute (Hamoodi Development Unit)|
>  Kosaran Pars Institute (Koot Development Unit)
>  Soil and Water Infrastructural Services Jihad Institute (Abuhomeizeh and Jalalieh   Development Units)
>  Soil and Water Engineering Services Institute of Iran (Ahmadabad and Jalalieh Development Units)
>  Khorasan Province Jihad Nasr Institute (Etabieh Development Unit)

Location:

Khuzestan Province – 20 km  west of Ahwaz in the vicinity of Hamidieh, Soosangerd and Howeizeh towns

>  Azadegan plain with an area of 59,000 hectares irrigable land, consisting of 30,000 hectares improvement lands and 29,000 hectares newly developed lands will be irrigated with 710 MCM allocated water annually.

>  Karkhehnoor land with an area of 44800 hectares of irrigable land consisting of 33640 hectares of improved lands will be irrigated with 538 MCM water allocated annually.

>  For 59000 hectares of Azadegan plain, 12600 hectares of south Karkhehnoor lands and 5000 hectares of Ghodss and Zamzam project lands with a total area of 76600 hectares water is taken off gravitationally from right headwork and intake structure with a capacity of 75 cms and a gravitational supply system.

>  32100 hectares of south Karkhehnoor land is mostly gravitationally supplied from Chamran conveyance canal with a capacity of 90 cms.

>  Project area is almost entirely located in the delta area of Karkheh River with physical, topographic and soil characteristics of deltaic areas and a very hot arid climate.

>  With due consideration to low infiltration rate, soil and salinity of shallow groundwater, sustainable agriculture in the area is dependent upon proper drainage and salinity control. Therefore to leach out excess soil salinity with irrigation water deep percolation surface irrigation with basin, low gradient border, flat furrows with closed ends have been proposed to irrigate the flat lands of the region to minimize irrigation runoff losses.

>  With improvising the above measures, forecasted attainable efficiencies are 70 percent for surface irrigation water application, 85 percent for water distribution in secondary and tertiary canals with intermittent flow, 90 percent for water conveyance through main and primary canals, with a total project irrigation efficiency of 54 percent.

>  One of the main distinguishing features of lower Karkheh irrigation project is deep open drains to facilitate lowering of saline groundwater to proper depths and provide continuous gravitational discharge of underground farm drainage systems to suitable outlets.

Project Components:

>  Water will be taken from the existing Hamidieh diversion dam, constructed in 1957, which will be rehabilitated in this project.

>  Main canal system 90 km long with initial capacity of 75 cms.

>  Main drain system 85 km with gravitational drainage discharge in eastern Azadegan plain with a coverage area of 29000 hectares and 41  km main drains in western Azadegan plain in an area of 30000 hectares.

>>  Eastern Azadegan plain irrigation projects in an area of 28034 hectares:

>  28 km of primary canals,
>  153 km of secondary canals,
>  35 km of primary drains,
>  157 km of secondary drains and waste-ways,

>>  Southern Karkhehnoor region with an area of 44753 hectares:

>  27.5 km of main canals,
>  104 km of primary canals,
>  246.5 km of secondary canals,
>  28 km of main drains,
>  73.5 km of primary drains,
>  356 km of secondary drain and waste-ways.

Pumping Stations:

>>  Seied Yousef  Pumping Station:

>  1.7 cms design capacity,
>  150 kW electrical power capacity,
>  4.0 m  dynamic head,
>  28.8 MCM total annual water uplift,
>  6 submersible in line pumps with a capacity of 380 l/s each.

>>  Faresieh Pumping Station:

>  0.75 cms design capacity,
>  90 kW electrical power capacity,
>  4.5 m  dynamic head,
>  8.5 MCM total annual water uplift,
>  3 submersible inline pumps with a capacity of 380 l/s each.

 Drainage Pumping Stations:

>  Drainage pumping stations for discharging farm collectors into secondary drains in the farms located at the low land region with an area of 7504 hectares.

>>  Number of Pumping Stations:

>  23 pumping stations including 4 units with single farm station outlets,
>  7 units with double farms station outlets and 12 units with more than two outlets.

>>  Capacity of Pumping Stations:

>  4 single units from 30 to 80 l/s for areas of 60 hectares to 150 hectares,
>  7 double units farm from 48 to 153 l/s for areas of 204 ha to 651 hectares,
>  12 units covering more than two farms from 94 l/s to 648 l/s with capacity of 333 hectares to 2236 hectares.