Programme Poster session 4
SELECTION OF HYDROLOGICAL DESIGN CRITERIA AS
WATER DEMAND IN ARGENTINIAN ISOLATED COMMUNITIES
Rafael, Fattor Claudio, Grande Andrés
Investigator of National Council of Scientific and Technical Researches. Main area of research:
Fattor Claudio: Hydraulic Engineer with main area of activities in the field of the design of hydraulic
Keyword(s): hydrology, mountain basin, rural communities, water resources identification,
Session: Poster session 4
The objective of this work is to propose a methodology for the
identification of water resources in mountain basins, being able to contribute to the analysis and selection of small
hydraulic works destined to improve the possibilities to develop sustainable projects of populations located in
regions of scarce economic resources.
Many isolated populations of Argentina still do not have access to
water resources able to be supplied in proper amount and good quality such that the sustainable development of
these communities can be guaranteed. The severe climatic conditions, the absence of roads, the lack of electrical
energy are, among others, daily problems that must be also borne in mind to understand the social complexity of
The problems previously exposed concerning water resources involve technical and social issues
that must be considered from a global viewpoint. This article deals with the guidelines considered for water resources
identification and the preliminary project of collection and distribution works for a small community located in the
northwestern area of Argentina. The rural population is known as San Isidro (province of Salta), with 350
inhabitants, being located at 2,800 m elevation above sea level.
San Isidro is located close to the
homonymous river, which is tributary to Iruya River. The surface of the river basin reaches 90 km2, with an average
slope close to 10%. The hydrological regime is pluvial, with a mean annual precipitation near 300 mm, mainly
concentrated between the months of December and March. In this season, there is a high probability of occurrence
of convective summer storms that may generate flash floods with the characteristics of debris flows. These facts
imply a restriction in the use of the water resource by the population as well as of the works that could be
considered, which are mainly restricted to the underground water resource.
The previous concepts were
considered when proposing a methodology for the identification of the adequate tools for proceeding to the
hydrological computation that are necessary to quantify run-off and underground water resource. Different
methodologies of calculation for the estimation of extreme flow discharges (minimum and maximum) in a region with
scarce hydrological and meteorological information were evaluated. At this stage, the convenience of avoiding the
use of complex hydrological and hydraulic methods was specially considered because that would demand data and
investments beyond the scope of a project trying to solve the problem of the access to the water of these
The hydrological and hydraulic studies carried out allowed defining a basic project of a work of
water collection from the sub-stream bed, able to guarantee the water supply along the whole year attending needs
coming from human consumption, basic agriculture, breeding and a possible micro-hydroelectric project.
proposed methodology has allowed defining the scope of different criteria of hydrological calculation in basins like
San Isidro catchment basin, where it is very important to bring a technical answer bearing in mind the social and
cultural issues of the communities.