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Watershed
Watershed divisions
The total land area of Iran is divided into six main basins, including Caspian Sea basin, Persian Gulf & Oman Sea Basin, Uremia Basin, Central Plateau Basin, Hamoon Basin, Gharqhoom Basin that in turn, form 30 sub-basins with subsequent divisions including sub-catchments, watersheds, sub-watersheds and finally micro-watersheds/catchments in lower levels based on their scales respectively. The total annual volume of precipitation equals 412 billionm3 of which 43.2 billionm3 are controlled and managed for utilization.
|
Area (ha.)
|
Sub-Basins
|
Main Basins
|
|
|
4001017
|
1-Aras river sub-basin
|
1- The Caspian Sea Basin
|
|
|
680934
|
2-Talesh river sub-basin
|
|
|
5917424
|
3-Sefidroud river sub-basin
|
|
|
1090255
|
4-Sefidroud & Haraz rivers sub-basin
|
|
|
1827267
|
5-Haraz river & Haraz-Gharesou rivers sub-basin
|
|
|
1308529
|
6-Gharesou & Gorgan rivers watershed
|
|
|
2679992
|
7-Atrak river watershed
|
|
|
17505418
|
Sub-total
|
|
|
3945210
|
1-Western border rivers sub-basin
|
2-The Persian Gulf & Oman Sea Basin
|
|
|
5146527
|
2-Karkheh river sub-basin
|
|
|
6616990
|
3-Karoun river sub-basin
|
|
|
4059940
|
4-Jarrahi & Zohreh rivers sub-basin
|
|
|
2125026
|
5-Helleh river watershed
|
|
|
4773157
|
6-Mand river & Basteheram, Karian & Khonj sub-basin
|
|
|
6247553
|
7-Kal & Mehran rivers sub-basin
|
|
|
4504688
|
8-Bandar Abbas and Sadij rivers watershed
|
|
|
4897421
|
9-Southern Baloichestan rivers watershed
|
|
|
42343512
|
Sub-total
|
|
|
5195775
|
1-Urmia lake sub-basin
|
3-Urmia Basin
|
|
|
5195775
|
Sub-total
|
|
|
9246329
|
1-Salt lake sub-basin
|
4- Central Plateau Basin
|
|
|
4148736
|
2-Gavkhoni sub-basin
|
|
|
3153282
|
3-Tashk, Bakhtegan & Maharlou rivers sub-basin
|
|
|
5716702
|
4-Abarghou- Sirjan sub-basin
|
|
|
6984459
|
5-Jazmorian sub-basin
|
|
|
20600128
|
6-Loot desert sub-basin
|
|
|
22621363
|
7-Central Kavir watershed
|
|
|
4870830
|
8-Siyahkouh, Rigzarrin and Deghsorkh deserts sub-basin
|
|
|
5052843
|
9-Daranjir & Saghand deserts sub-basin
|
|
|
82403672
|
Sub-total
|
|
|
3298598
|
1-Degh patargan- Khaf sub-basin
|
5- Western Border Basin
|
|
|
3371551
|
2-Hirmand sub-basin
|
|
|
3665860
|
3-Mashkil sub-basin
|
|
|
10336009
|
Sub-total
|
|
|
4402526
|
1- Ghar-e-Ghum sub-basin
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6- Ghar-e-Ghum Basin
|
|
|
4402526
|
Sub-total
|
|
|
162186912
|
|
|
|
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