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Fifteen years ago &#194;&#171;La Mancha H&#250;meda&#194;&#187; was deelared Biosphere Reserve by UNESCO, at the request of the Spanish Government. According to a recent deelaration by UNESCO in 1995, such title could be lost if the degradation processes of the wetlands of &#194;&#171;La Mancha H&#250;meda&#194;&#187; continue. &#194;&#171;La Mancha H&#250;meda&#194;&#187; was formed by a hundred of small lakes or wetlands that in area totalled about 200-300 km2 and they were distributed over an area of about 25.000 km2. These are different types of wetlands (saltwater and freshwater, permanent and ephimeral, riparian and closed basins, etc.). It is estimated that the actual surface of all the wetlands is about 20-30% of that occupied 20 or 30 years ago. The most famous degradation case is that of the &#194;&#171;Tablas de Daimiel National Park&#194;&#187; that has shrinked fram an area of about 15-20km2 to less than 1 km2 This article presents the general situation of the riverine wetlands of the Cig&#252;ela river and the results of the hydrological functioning of a wetland of modest dimensions, less than 1 km2, El Masegar. It is a riparian wetland located in the Cig&#252;ela River basin which has been severely affected by man actions. El Masegar can be considered as an artificial wetland. From an ecological point of view, this wetland seems to have been functioning in a proper way until 1988, when the so called &#194;&#171;Plan de Regeneraci&#243;n H&#237;drica del Parque Nacional de las Tablas de Daimiel&#194;&#187; began. This Plan has not regenerated the Natural Park but has degradated or destroyed the riparian wetlands that existed along the Cig&#252;ela River valley which is about ISO km long. The surface of these wetlands all together was larger than that of Tablas de Daimiel National Park. The study shows that it could be feasible to restore or maintain most of the riparian wetlands of the &#194;&#171;La Mancha H&#250;meda&#194;&#187; without a great economic investment and without social conflicts with the farmers. En 1981, a petici&#243;n del Gobierno espa&#241;ol, la UNESCO declar&#243; Reserva de la Biosfera &#194;&#171;La Mancha H&#250;meda&#194;&#187;. En 1995 la UNESCO ha indicado que este t&#237;tulo puede ser retirado si contin&#250;a la degradaci&#243;n del conjunto de humedales que integran esa Reserva de la Biosfera. La &#194;&#171;Mancha H&#250;meda&#194;&#187; estaba formada por un centenar de peque&#241;as lagunas o humedales que totalizaban una superficie de unos 200-300 km2 y se repart&#237;an en un &#225;rea de unos 20.000-25.000 km2. Las lagunas tienen unas caracter&#237;sticas muy diversas (salinas y dulces, permanentes y ef&#237;meras, ribere&#241;as y endorreicas, etc.). Se estima que la superficie actual conjunta de esas lagunas apenas alcanzan el 20-30% de la que ocupaban hace 20 &#243; 30 a&#241;os. El caso de degradaci&#243;n m&#225;s conocido es el del Parque Nacional de las Tablas de Daimiel, que ha pasado de ocupar una extensi&#243;n de 15-20 km2 a menos de 1 km2. En este trabajo se analiza la situaci&#243;n general de los humedales del r&#237;o Cig&#252;ela y se presentan los resultados del an&#225;lisis del funcionamiento de un humedal de modestas dimensiones, algo menor de 1 km2, El Masegar. Se trata de un humedal ribere&#241;o ubicado en la cuenca del r&#237;o Cig&#252;ela que puede considerarse como un humedal artificial, creado por el hombre. Desde el punto de vista ecol&#243;gico, este humedal parece haber funcionado muy bien hasta que en 1988 comenz&#243; el denominado &#194;&#171;Plan de Regeneraci&#243;n H&#237;drica del Parque Nacional de las Tablas de Daimiel&#194;&#187;. Este plan no s&#243;lo no ha regenerado ese Parque, sino que ha degradado o destruido los humedales ribere&#241;os existentes a lo largo de unos 150 km del valle del r&#237;o Cig&#252;ela. La superficie conjunta de esos humedales era ampliamente superior a la superficie del PNTD. El estudio realizado indica que es posible restaurar o conservar gran parte de los humedales del r&#237;o Cig&#252;ela, sin un gasto econ&#243;mico excesivo y sin conflictos sociales con los agricultores

Funcionamiento hidrológico de un humedal ribereño, el Masegar, en el conjunto de los humedales de La Mancha Húmeda de la cuenca alta del rió Cigüela