Why is there water scarcity in La Guajira?

There are many reasons about wáter scarcity in La Guajira.
One these are the government diverted the river,
Other reason is oil companies, I mean they use the water for get more oil.
I think that other reason is the climate change In La Guajira hasn't rained for several months.

What can we do to save water and protect the environment in Colombia?

I think that we can make different adds. I mean we can do campaing about it, also we have to save water because there are people that waste the water while take a shower or brush their teeth and other things.

I propose that we have to save water and send it to La Guajira.
In addition we should think in send food to this place. because in this place there aren't food and the indigenous people are die.