Hidrologia De Jamastran

JAMASTRAN VALLEY IRRIGATION PROJECT

TOPOGRAPHY

The Jamastrán Valley is located In the Department of El Paraíso in the Eastern central part of the country, 22 km from the city of Danlí, between the 14º00' 23" latitude and the 86º 20' 29" longitude, with 19,696 hectares of land surface and controlling more than 80% of the area of influence in the municipality of Danlí. The valley is approximately 19 kilometers long, with a surface area of about 200 square kilometers for the Project area. The average elevation is between 400 and 500 meters (meters above average sea level).

The valley’s land are alluvial, medium fertility and plain topography, with a sandy-clay texture with low organic material content and a medium depth of 140 cm. and is watered from the south western part by the Guayambre River, which is joined, south side by the Hato, San Francisco and El Águila Rivers and on the north side by the Los Almendros River. The tributary crosses the valley from south to north, which can be useful to provide an appropriate water resource to irrigate up to 6,000 hectares. In addition, the Jamastrán Valley has abundant groundwater for the implementation of an irrigation system of up to 2,000 hectares.

The Valley has good soil and the hydrological conditions for the development of the efficient production of irrigated land, the availability of three ground water sources and abundant groundwater sources with outstanding water pick up and distribution. This land is excellent for intensive agriculture and the linking the area with national and foreign markets. Seer ANNEX 1 Jamastran Plans

HYDROLOGICAL STUDIES AND PROJECT SUSTAINABILITY

Background

The report contains the hydrological analyses that provide information on the availability of water for crops, in function of the climate variables in the zone. It also provides the statistical analyses for the generation of derivation flow rates at water’s edge and finally, it presents the flow rate values necessary for the design of works for excess dam water and the subsequent regulatory works, statistically presented for various return periods (TR).

The hydrological analysis methods correspond to recommendations from the Food and Agriculture Organization (FAO) for the development of irrigation systems and the United States Soil Conservation Service (SCS) for maximum flow rates.

Hydrography

The Jamastrán Valley is located in the Department of El Paraíso in the Eastern part of the country. The map below demonstrates the location of the Valley:

Figure 1 Map of the Geographic Location of the Jamastrán Valley

Orographically, the Valley is found in the South between the Dipilto Sierra on the border with Nicaragua and North of the La Batea El Pastal, Cuyamapa, Villa Santa, Las Chichimoras Mountains and the El Pajarillo Ridge.

Hydrographically, the Valley is irrigated by several important rivers including:

• The San Francisco River originating from the Dipilto Mountain Range, formed by the Left Manga and right Manga River courses (La Esperanza),

• The El Hato River also originating from the Dipilto Mountain Range and known at the upper basin as the Conchagua, at the middle basin as the Apalí River and in the Valley as the Hato River,

• The San Antonio River, known at the upper basin as the Vallecillos River, at the middle basin as the San Antonio River and in the Valley as the Los Almendros River where it receives lesser but important water flows such as the El Zarzal Creek and Quebrada Larga.

On

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