The court delivered its "final award" last night after India requested clarification of an order issued by it in February.
In its "partial award" in February, the court upheld India's main contention that it has the right to divert waters of western rivers, in a non-consumptive manner, for optimal generation of power.
The western rivers are allocated to Pakistan under the Indus Waters Treaty of 1960.
The "final award" specifies that 9 cumecs of natural flow of water must be maintained in Kishenganga river at all times to maintain the environment downstream, said a statement from the Indian High Commission here.
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"We have also received the clarification we sought from the court with regard to the technique of draw-down flushing used for the de-siltation of reservoir in run of the river power projects in the western rivers of the Indus," the statement said.
The court said alternative techniques will have to be used for Kishanganga hydroelectric project and all future run of the river projects undertaken on western rivers of the Indus system.
Contrary to negative propaganda that the Indus Waters Treaty has been receiving in recent years, the International Court of Arbitration's award has shown the pact is a strong framework for division of river waters between India and Pakistan, the statement said.