Watersheds
 

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 billion m3 of which 43.2 billion m3 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

6- Ghar-e-Ghum Basin

4402526

Sub-total

162186912

 

Total

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