Hydrological studies in the first thing is always the capacity of a basin or from the territory under study, thereby giving always a finite number of available units of water. At this point is when you can plan or distribute according to needs. In the case of water availability basin, which is planned or distributes the Hydrographic Confederation relevant or directly by the State.
He also taught me that the hydrological planning is done based on the requirements of water use. Roughly the order is as follows:
- Human consumption
- Agriculture, livestock and industry
- Recreational uses
To put this into practice such planning, there are basically two forms of action on surface water.
- The first of these actions is regulation by dams, so that you can control the flow downstream to maintain some stores of water.
- The second action is the transfer or flow of communication between different rivers, which may be of the same basin or different, so that excess water can fill the deficit.
Of course, the concessions of water harvesting must be regulated and accounted for both in total abstraction, or flow instantaáeo deadline acquisition.
All this is being said these days about whether to mount a transfer or not to supply water to the people of Barcelona, because obviously there will have to be, and of course this is a diversion. What is going to be a shift if not? We are using the waters of a river where the river does not pass.
However, since when rizan to limit the things we hear nonsense like that have been said today in some ways, they said that the expenditure of water is inversely proportional to its price. And therefore, since Barcelona in the water is paid more expensive are saving more than in the rest of the adjournment, Valencia, Murcia and Almeria.
Let's see, I believe that the prices of the service of potable water are set in a different way, and will have different costs of water distribution networks and others. It may also pass the distribution system of Barcelona is much better than in Valencia and that's why the price of a cubic meter is higher. And that can pass better distribution improvement savings and reduces losses. Or it may simply be that someone is taking water either side.
Ultimately, the storm of the Ebro has become a reason to hide his hand for several reasons. First by making a previously when he had been repeatedly cursed. Of course they do directly by decree after the election, and because they can not do directly the confederation nor the government. In addition remember that part of the surplus water in the Ebro is recreational use in the Delta, use that is last in the order of priorities.
Why the Ebro is the object of all transfers? Well, simply because it handles more water. To get an idea, the Guadalquivir River has about total of 3362 hm 3 / year while only the regulatory capacity of the Ebro in 7580 and is hm 3 / year. 
SALINISATION LAND
However, we also see on television as irrigators Ebro throw salt on the doorstep of administrations, saying that well with the absence of its land is saline water. Salinization of the soil can occur when the total contribution of irrigation does not cover a fraction of washing salt. That is, so that there is this physical phenomenon, is to be a contribution to the plant and provide a wash. Clearly, this only happens when we are talking about risk area (not localized irrigation) and when these irrigation area have been ongoing for many years.
So the fear of salinization of the irrigation of the Ebro, I indicated to me that they are making a thrifty use everything that could do it. It is clear that the electrical conductivity of their land, salinization, and will be equal to the water in that river. So we must continue to use such water, or other better quality to prevent salinization, but still require an extra contribution to get rid of the salts. Although of course, be best to modernization.
