Validation of the methodology for the calculate of the index of underground water shortage, proposed by the ideam in Bogota D.C.

Abstract

The Scarcity Index (Ie) is one of the components of the equation to determine the WATER USE RATE (TUA). This rate is applied in superficial waters and in underground waters in order to recognize a tax for the exploitation of the resource. The purpose of this investigation is to determine, in practical way, the validity of the application of the underground waters Ie. In the superficial waters the Ie is determined and applied in an experimental and theoretical way. The main purpose of this article is to analyze the validity of the methodology to calculate the value of Ie, and also to know how representative it might be in the TUA. With the collection of the TUA tax, the State intends to have economic resources to renew the underground water resource; to guarantee that this resource is not exploited in an excessive way causing long term exhaustion, and at the same time, to guarantee reinvestment programs. Inside the Ie methodology, there are two determining factors: the Captured Flow and the Exploitable Flow, where the first one is determined by the consumption of the resource in the studied area, and the second one determines the existent recharge in the same area. Of these preliminary antecedents it is necessary to carry out a detailed study of the methodology of the Ie and so to determine the validity of this methodology proposed by the Ie