underlies the provinces of

(1)

ISARM: INTERNATIONAL SHARED AQUIFER ISARM: INTERNATIONAL SHARED AQUIFER

RESOURCES MANAGEMENT RESOURCES MANAGEMENT

REGION AMERICA REGION AMERICA

STUDY CASE: AQUIFER SYSTEM STUDY CASE: AQUIFER SYSTEM

YRENDA

YRENDA –– TOBA TOBA –– TARIJETARIJEÑÑOO

This Transboundary Aquifer system is shared by : Argentina (called Toba), Bolivia (called Tarijeño) and Paraguay (call YRendá).

During the development of the International Workshop of ISARM Americas (UNESCO/OEA Program) August, 2004 in

(2)

(3)

(4)

Preliminary Program Preliminary Program

Results Results

Active Participation of 24 Active Participation of 24

American Countries.

59 transboundary aquifers 59 transboundary aquifers

identified:

•• 35 in South America35 in South America

•• 13 in Central America13 in Central America

•• 3 in the Caribbean (Haiti 3 in the Caribbean (Haiti -- Dominican Republic)Dominican Republic)

•• 8 in North America 8 in North America (between Mexico and U.S.

(between Mexico and U.S.

only) only)

(5)

YRENDA

YRENDA –– TOBA TOBA –– TARIJEÑTARIJEÑOO

(6)

- Rio Grande - Rio Parapeti - Rio Pilcomayo - Rio Bermejo - Rio Salado

In the Republic In the Republic of Bolivia it

of Bolivia it embraces the embraces the Departments of Departments of Tarija

Tarija, ,

Chuquisaca

Chuquisaca and and Santa Cruz de la Santa Cruz de la Sierra, and it is Sierra, and it is associated with associated with the alluvial cones the alluvial cones of the large rivers of the large rivers of the

of the ChaqueChaqueñaña plain, like

plain, like Grande,

Grande, ParapetíParapetí, , Pilcomayo

Pilcomayo, , RojoRojo and and SaladoSalado..

(7)

Location of:

Water Wells

Climatologic Stations

Hydrogeological Units

Correlacion de pozos en el valle de Yacuiba

(8)

• • In Paraguay it is considered included in the In Paraguay it is considered included in the great region of El Chaco and in Argentina it great region of El Chaco and in Argentina it

underlies the provinces of

underlies the provinces of Tucum Tucum á á n n , , Salta Salta , , Santiago del

Santiago del Estero Estero and Chaco. and Chaco.

• • Because of the great geological heterogeneity of Because of the great geological heterogeneity of the silts that contains the water and the spatial the silts that contains the water and the spatial

variability of the water quality, from saline variability of the water quality, from saline - -

brackish to fresh, the quantity of people who brackish to fresh, the quantity of people who

would be dependent upon this resource (which would be dependent upon this resource (which

should be better evaluated), is considered should be better evaluated), is considered

greater than 500.000.

YRENDA

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• •

In some sectors, such as in the In some sectors, such as in the paleoterracepaleoterrace area of the area of the alluvial cone of the

alluvial cone of the PilcomayoPilcomayo river, there are some river, there are some restrictions for human and irrigation uses, due to the restrictions for human and irrigation uses, due to the high salinity of the water contained in the shallow high salinity of the water contained in the shallow aquifers, located at about 140 meters in depth.

aquifers, located at about 140 meters in depth.

• •

The probable groundwater reserve in a large part of the The probable groundwater reserve in a large part of the Bolivian Chaco is not very well

Bolivian Chaco is not very well--known yet. In order to known yet. In order to make suggestions of sustainable uses of the make suggestions of sustainable uses of the groundwater resource, it is necessary to study in depth groundwater resource, it is necessary to study in depth aspects such as the recharge

aspects such as the recharge--discharge relationships.discharge relationships.

YRENDA

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• •

In Paraguay it is called Aquifer In Paraguay it is called Aquifer ““YRendaYRenda”” (Y: place, (Y: place, RendRendáá: water) to the groundwater complex composed by : water) to the groundwater complex composed by confined and

confined and semiconfinedsemiconfined aquifers lodged in silts of the aquifers lodged in silts of the Tertiary and Quaternary.

Tertiary and Quaternary.

• •

In Argentina there is a great heterogeneity in its water In Argentina there is a great heterogeneity in its water quality and in the yield of the different aquifers that quality and in the yield of the different aquifers that compose the system.

compose the system.

It behaves as a multilayer system, composed by an It behaves as a multilayer system, composed by an unconfined aquifer and, in depth, an unknown number unconfined aquifer and, in depth, an unknown number of of semiconfinedsemiconfined and confined layers. and confined layers.

It has an alternation of levels with salted

It has an alternation of levels with salted--brackish and brackish and fresh water, and these levels have not been properly fresh water, and these levels have not been properly

identified and sized yet.

YRENDA

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Preliminary Toba Aquifer west boundary

YRENDA

(12)

• •

In the 3 countries there are studies carried out at In the 3 countries there are studies carried out at different scales, which define some aspects of the different scales, which define some aspects of the regional geology,

regional geology, hydrogelogyhydrogelogy and even the and even the identification of the

identification of the hidrochemicalhidrochemical characteristics with characteristics with the use of isotopic hydrology, but only in some sectors the use of isotopic hydrology, but only in some sectors of the system.

of the system.

• •

An integration of the existent information is necessary in An integration of the existent information is necessary in order to identify the reservoir geometry and to establish order to identify the reservoir geometry and to establish the mechanisms of its behavior. On this basis, it would the mechanisms of its behavior. On this basis, it would be possible generate the management plans for the be possible generate the management plans for the regional development .

regional development .

YRENDA

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Regional Cross Section

YRENDA

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Groundwater Age

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Fm . Itacuami Fm

. Tarija Fm

. Las Peñas Fm

. San Telmo Fm

. Tranquitas

Fm . Tupambi Fm . Iquiri

Fm San

Telm o

Fm. T arija Fm

B.St.Yac.x-2

B.St.Yac.x-1001

Fm Tran

quitas

Efluentes salinos

19 18 17 16

Pozo AS0540 R.N. N° 34

70 15

177 30

17 14 24 26 68 51 139

56 18 83 56 218

38 80

39 17 25 14

Fm Las P

eñas

N.M.

FFCC Qda. Caballorenda

Qda. Saltos de Pardo Qda. Juan Lopez Qda. Yaguami

ST LP

Ta It

Tup 1

3

4 5 6

7 2

Yac.-1

Piquirenda-1

Fm. T upam Fm

Los Mon

Tuy.es-1(Proy.)

Fm . Los Monos

Fm . Itacua

Terciario Subandino Terciario Subandino

F3

F2

F1

SIERRA DE AGUARAGÜE

FALLA DE AGUARAGÜE Intervalo de

Inyección

Arroyo Yacuy

Regional Profile

Yacuy

YRENDA

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• • Improvement of the scientific and Improvement of the scientific and

technical knowledge of the aquifer system technical knowledge of the aquifer system

• • Groundwater Management Groundwater Management

• • Legal and Institutional understanding for Legal and Institutional understanding for groundwater management

groundwater management

• • People participation, education and People participation, education and communication

communication

YRENDA

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YRENDA

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IGME, 1999

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Grupo de Investigaciones

Grupo de Investigaciones GeohidrolGeohidrolóógicasgicas Facultad de Ingenier

Facultad de Ingeniería y Ciencias Hía y Ciencias Híídricasdricas Universidad Nacional del Litoral

Universidad Nacional del Litoral Santa Fe

Santa Fe -- ArgentinaArgentina

Ciudad Universitaria Ciudad Universitaria Casilla de Correo 217 Casilla de Correo 217

(3000) Santa Fe (3000) Santa Fe 0342-0342-4575244 4575244 intint 150150

E-E-mail: pichy@fich.unl.edu.armail: pichy@fich.unl.edu.ar

Dra. Ofelia C. Tujchneider

Directora