Objective of the joint project:

The concepts the were developed within the scope of the feasibility study provide a basis for a pilot project (2002 - 2005) with the goal of guaranteeing the supply of water to the population during dry seasons through the application of regenerative energy resources and appropriate technologies.

This approach allows an easy understanding of the technology management (operation and maintenance) and satisfying the requirements of man and nature in a harmonic way.

For the realization of the targets, an interdisciplinary approach involving the fields of hydraulic engineering, water management, geodesy, geochemistry, material engineering as well as timber engineering are necessary.

Besides, a socio-economic study for the planned project is indispensable.

Within the scope of the study the prognosis of the impacts of an improved water supply on the structural development of the Gunung Sewu region will be provided.

Development of Gua Bribin as Laboratory
and Demonstration Cave

The demonstration cave scheme which could be used as a field laboratory for many experimental studies has the following variants in implementation:

Variant I:
Partial damming of the water flow system by a reinforced concrete dam with an integrated micro hydroelectric power plant.

Variant II:
Energy production for water supply through the construction of a weir and a pressure pipeline.

Variant III:
Energy production for water supply through a cascade of weir systems with open channel flow

By establishing an underground micro hydroelectric power plant with installed capacity about 250 - 300 KW,
70 l/s of water could be continuously pumped.

This would be sufficient in order to supply a population of 75.000 people with 80 l/day of drinking water. The current capacity of the water supply during the dry seasons is in some extent under 10 l/day per capita.


Development of Capacity Building

The pilot project should provide the basis for the realization of further large scale projects. In view of the basic conditions, this project must be based on scientifically, technologically, and socio-economically acceptable methods. It should also consider the ecological aspects of soil, water and energy. Thereby, it provides an outstanding possibility for the exchange of science and knowledge concerning the subjects of energy and natural resources.

The basic principle is to create and to implement a teaching program, which would be adapted to the scientific concerns of the local universities and the practical training for the operation and the maintenance of the water management technologies. The expansion of the already existing capacity building, covers the exchange of scientists and experts as well as the supervision of local research and dissertation.

The sustainability of the research and development would be supported by the concept of a 2+2 project in accordance with the guidelines of the BMBF. It would be comprised of distinguished partners from the scientific institutions and the industries belonging to both the nations.


Basic Concept of Cave Management




Sketch of variant I




Example of a wood stave pipeline (Var. II)




Concept of the 2+2 project in accordance with the guidelines of the BMBF