Obstacles to peace: Water

The Arab-Israeli dispute is a conflict about land - and maybe just as crucially the water which flows through that land.

The Six-Day War in 1967 arguably had its origins in a water dispute - moves to divert the River Jordan, Israel's main source of drinking water.

Years of skirmishes and sabre rattling culminated in all-out war, with Israel quadrupling the territory it controlled and gaining complete control of double the resources of fresh water. A country needs water to survive and develop.

In Israel's history, it has needed water to make feasible the influx of huge numbers of Jewish immigrants.

Therefore, on the margins of one of the most arid environments on earth, the available water system had to support not just the indigenous population, mainly Palestinian peasant farmers, but also hundreds of thousands of immigrants.

In addition to their sheer numbers, citizens of the new state were intent on conducting water-intensive commercial agricultural such as growing bananas and citrus fruits. Israel says the 1967 war was forced upon it by the imminent threat of hostile Arab countries and there was no intention to occupy more land or resources. But the war's outcome left Israel occupying an area not far short of the territory claimed by the founders of the Zionist movement at the beginning of the 20th Century.

In 1919, the Zionist delegation at the Paris Peace Conference said the Golan Heights, Jordan valley, what is now the West Bank, as well as Lebanon's river Litani were "essential for the necessary economic foundation of the country. Palestine must have... the control of its rivers and their headwaters".

In the 1967 war Israel gained exclusive control of the waters of the West Bank and the Sea of Galilee, although not the Litani.

Those resources - the West Bank's mountain aquifer and the Sea of Galilee - give Israel about 60% of its fresh water, a million cubic metres (1 MCM) per year.

Heated arguments rage about the rights to the mountain aquifer. Israel, and Israeli settlements, take about 80% of the aquifer's flow, leaving the Palestinians with 20%.

Israel says the proportion of water it uses has not changed substantially since the 1950s. The rain which replenishes the aquifer may fall on the occupied territory, but the water does flow down into pre-1967 Israel.

But the Palestinians say they are prevented from using their own water resources by a belligerent military power, forcing hundreds of thousands of people to buy water from their occupiers at inflated prices.

Moreover, Israel allocates its citizens, including those living in settlements in the West Bank deemed illegal under international law, with between three and five times more water than the Palestinians.

This, Palestinians say, is crippling to their agricultural economy. With water consumption outstripping supply in both Israel and the Palestinian territories, Palestinians say they are always the first community to be rationed as reserves run dry, with the health problems that entails.

Not surprisingly, during the era of Arab-Israeli peacemaking in the 1990s, water rights became one of the trickiest areas of discussion.

They were set aside to be dealt with in the "final status" Israel-Palestinian talks, which were never concluded.

BBC