Identify and rank the ways out of the crisis Urumia Lake using Delphi

Droupht is one the natural phenomena which the most damage of it will be seen in deserts and semi-deserts. Today Urumia lake basin with its high crowded accumulation is one of the most important challenges in Iran Enviornmental discussions.So that in these days because of low water volume enterance and local rainfall shortage the existence of this lake has been threatened seriously.This basin is 52000 km2 and its rain is about 200-900 mm,the water volume is about 22 bilion m3 .because of the deduction of the lake basin area and the expected water enterance to the lake, complete revival of the lake will be far expected.In this research we try to indentify and rank the ways out of crisis by use of Delphi method and hierarchical order,the effect limit of each one of these methods will be determined and obtain managemental priorities for them.according to the results of this research among four recognized original standards and 21 substandards,the rivers' rights ,ponds and aquifers ending to the lake with 32percents effect and use of modern irrigation methods by 10.2 percents effect are the most important ways out of crisis of Urumia lake.