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Water and energy are key component of almost all human activities. Water supply is vital to feeding the growing world population, to production of mat natural systems on which life on earth relies. In the context of erial goods which cause rising of living standards and to maintaining the integrity of world water crisis, more and more governments have begun to develop new policies for future, aiming at rationalization and efficiency of water consumption. Maximum reduction of waste and undue loss of water is an important objective in the management of water resources. In this sense any valuable technical solution that helps achieve these goals, especially at the large water consumers, deserves to be implemented. To illustrate this, we propose the use of the automated land leveling systems, tracing a laser reference plane, as a method of reducing water losses in two activity areas: crop irrigation and construction of earth dams in hydropower stations. In the last decade, these works are performed with leveling machines equipped with laser modular systems manufactured by companies like TOPCON from Japan or APACHE and SPECTRA PRECISION from USA. In the first kind of activity, the solution ensures equal conditions, in terms of water consumption, for all plants on agricultural land, watered by natural way rainfalls, or artificially by irrigation systems. This solution prevents areas of "pools" of water on agricultural land, and providing deviations from the reference plane of max. ± 2 cm by only 2 passes of the leveling machine (rough, and smoothing leveling) eliminates soil loosening works, which are necessary after conventional leveling. In the second case, the method ensures optimal thickness, depending on the type of compression equipment, of the earth layers deposited when constructing dam body, with maximum deviations of ± 2 cm over the entire surface of the deposited layer. This type of smoothing performed before the compaction of each layer of soil deposited in the dam body, ensures a uniform degree of compaction of the dam, fig.1. Homogeneity of dam compaction is a measure for reducing seepage through the dam and pronounced settlements of the top, causing possible overflowing of water above the top of the dam, fig.2. Laser modulation systems are not included in the standard facilities, not even in the latest modern leveling machines, fig.3. They can be installed on any hydraulically actuated

Applications of the Electrohydraulic Servomechanisms in Management of Water Resources