"Temporary Ponds: a natural habitat to be protected!"


> Hydrogeology

Analysis of the hydrological and hydrogeological framework concerning the ecological conditions of the temporary ponds:

The current knowledge about the ecology and biology of these habitats has been sufficiently studied to allow the understanding that the evolution of the hydroperiod (inundation period) - which varies between years (regarding its beginning and length) depending on climate conditions – is extremely important in the control of diversity and maintenance of plant and animal communities within these habitats. Although ephemeral, the hydroperiod of most of these ponds is longer than the corresponding simple accumulation of rainwater on depressions of land with low permeability, being extended by the connection to groundwater to which they are hydraulically connected.

The temporary ponds within the project area are located in recent sedimentary deposits laying over schists and greywackes from the carbonic age. In these cases, since the underlying crystalline rocks are less permeable than the sediments where the ponds occur, most of the water infiltrating in the sedimentary rocks cannot infiltrate deeper providing the rise of the groundwater levels, creating temporary ponds in depressions and headwaters of water lines radiating from the detritic sediment.

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