Description of the Sources of Water in the Departmental

5. Description of the Sources of Water in the Departmental

Capital Cities

A. The Rio de la Paz Basin . The formation of the Río de la Paz drainage network is parallel,

5.1 The LaPaz/El Alto Metropolitan Area

due to the presence of uniformly spaced and relatively parallel rivers running from North

This treatise considers both cities La Paz/El Alto as to South. Its headwaters are in the snows of the Metropolitan Area. The criteria used in defining

Chacaltaya, with the name Rio Kaluyo, which the name “metropolitan area” are the following:

would later be changed to the Choqueyapu continuing urban sprawl, and the relationship

River, which runs all the way across the city of flow between both cities, including the public

La Paz. It joins the secondary Orkojahuira River transportation system, the provision of basic

(known upstream as the Chuquiaguillo), the drinking water, electric energy, public transportation

Irpavi and Hampaturi Rivers (known upstream and communications services. This creates a

as Khallapa and Mikhaya), and the Achumani highly dynamic scenario, which consolidates the

and Huañajahuira Rivers to form the Río de la relationship between the two cities. However, they

Paz, or La Paz River in the southern part of the do not have the same quality and coverage of public

Municipality, emptying its waters into the services, especially with the supply and use of water.

Amazon Basin. This basin has an area of 535 square kilometers and covers the entire urban

5.1.1 Hydrology and Hydrogeology

area. (Núñez, 2004).

The configuration and physical structure of the urban

B. The City of El Alto , in the middle of the Bolivian sprawl of the city of La Paz are influenced by the

highlands, at an elevation of 4,035 meters above water network, comprising five water basins, which

sea level, has shallow ravines that cut through make up the La Paz River basin. It also has some 350

the fluvial-glacial quaternaries which, during tributary ravines which open into rivers, streams and

the rainy season fill with water and tend to flood creeks which cause landslides and highly dangerous

the lower parts of the city. The major ravines flash floods during the rainy reason. This water serves

run North to South and are nearly parallel: as a clandestine dump for approximately 100 metric

a. The one known as Rio Seco (dry river) tons of waste and rubble daily.

crosses the highway in route to Lake Titicaca and Peru.

b. The Sake River ravine, which originates in Figure 5.1 Layout of Water Sources and Systems for the Metropolitan Area

the Milluni dam.

5.1.2 The Drinking Water Supply

The La Paz/El Alto Metropolitan area has a population of 1,613,457 inhabitants (CNPV, 2012) and a total of 370,574 dwellings. Of these, 86.35% receive piped- in water furnished by the Public Social Water and Sanitation Company (EPSAS), The population with drinking water service in the city of La Paz numbers 764,060 inhabitants, establishing a coverage of 91% according to EPSAS. This does not include around 30,000 inhabitants (4,763 water connections) served by 38 co-operatives from the slopes (the source of water from natural springs), who experience problems with the quality of their service. This increasesthe degree of coverage to 94.5%

Source: EPSAS, La Paz.

COMPENDIUM OF THE WATER RESOURCES IN THE CAPITAL CITIES OF THE DEPARTMENTS OF BOLIVIA

For El Alto, the population with drinking cities –La Paz and El Alto and their adjacent areas water service numbers 981,812 inhabitants, with a

(Acholaca and Viacha)– reach 1,745,872 inhabitants. coverage of 99%. (See Table 5.1 and Figure 5.2). In the

(See Table 5.1). This is an overall service coverage of city of La Paz there are three distribution systems

95%, and there are 312,117 active connections. which receive flows of water generated by the ice covering the mountain peaks of over 5,000 meters

5.1.3 Sewerage Services

above sea level. The plateau system in the city of El According to EPSAS (2011), a total of 1,376,562 Alto is also fed by glacial waters, while the Tilata

inhabitants of the La Paz Metropolitan Area have system depends on 30 groundwater wells.

sewerage service, out of a projected total of 1,836,737 According to the EPSAS plans for 2011, the area

inhabitants. (See Table 5.2). The overall coverage is covered by the drinking water piping network is

75%, with 216,866 active sanitary sewer connections. 7,583 hectares (La Paz) and 13,455 hectares (El Alto), for

The present sewage service covers 6,372 hectares (La

a total of 21,028 hectares. This represents 80% of the Paz) and 8,653 hectares (El Alto), for a total of 15,025 potential service area. EDPSAS has records to show

hectares. This means that the sanitary sewerage that the population with drinking water in both

system covers only 57.2% of the potential service area.

Table 5.1 System-by-system drinking water service and connection area System

Number of connections Achacachi

Population in 2011

Area ( (hectares)

El Alto ( La Paz Slope)

La Paz – Population Served/Area with Piped-in Water

119,044 La Paz – Projection/ /Total Area

La Paz Coverage

El Alto ( Plateau)

El Alto (Tilata)

El Alto – Population Served/Area with Piped-in Water

193,073 El Alto – Projection//Total Area

El Alto Coverage

Total – Population Served/Area with Piped-in Water

Total – Projected Population/./Total Area

312,117 Source: In-house document based on data from EPSAS in La Paz.

La Paz/El Alto Coverage / TOTAL CONNECTIONS

Table 5.2 Current sanitary sewer service and connections by systems System

Number of EPSA Connections La Paz Serviced/Area with Piped-in Water

Population 2011

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