Juan G. R. The exploitation of excessive rains in Spain requires more hydraulic development.
Water and Irrigation, Volume 1, Nº 2: 1-2, 2010, Spain.
The year 2010 in Spain, considered to be wet so far, shows that the use we make of the excessive water is insufficient and need to build more drainage systems, more water projects which increase the regulation of runoff, further transfers carrying water from water abundant areas to water deficit areas and enable the evacuation of large volumes quickly.
A large number of dams in the affected areas were at its maximum capacity, which indicates that the action plan adopted in the regulation of excessive water is insufficient, as major floods occurred in many towns, cities and agricultural areas, which caused great economic losses, property damage and human losses. The agriculture is a strategic sector which through economic problems and is necessary to achieve greater water development to improve its profitability and competitiveness.
The entry into Spain of different fronts and disturbances, during the winter of 2010 which has been accompanied by heavy rainfall has caused severe flooding in rural and agricultural areas of the Community of Andalucia, on the island of Tenerife in the Canary Archipelago and with less intensity in the Valencia Community, Balearic Islands, Aragon and the Communities in the north. In the February floods have caused damages in Sevilla, Cordoba and Jaen where about 70% of the water reservoirs have been free the water stored. The accumulated rainfall in the month of February in the Community of Andalucia were more than 250 litres per m2, which double the rainfall in Spain for that month. In March several rivers overflowed again in the Community of Andalucia, where over 1,500 people had fled their homes as a result of increased spending of the Guadalquivir River, which the March 6 of 2010 reached a rate of 2700 m3/sec., lower than in this river in the flood of 1963 with a value of 6000m3/seg.
During spring 2010 floods also occurred, but this time mainly affected communities in the north of Spain. On June 10 fell in Asturias and Lugo over 87 litres/m2 in 12 hours, causing flooding by the overflow of rivers in coastal areas, on 14 June rains caused flooding in the region of Cantabria, affecting urban and rural areas of different municipalities, 15 June 5 rivers overflowed in Biscay, where the accumulated rainfall was 124 litres/m2 in 21 hours. Rainfall for the period January to June is considered high, with a significant equity in the period 2001-2010, the water stored in Spain on June 22, 2010 is 46 388 cubic hectometres for 84% of storage capacity of the country, which is considered high for this time of year.
.During the month of September 2009 to finish the summer in Spain have been affected by local flooding dozens of towns and cities, which caused great economic losses, and three people swept away by heavy rains. During the fall of 2009 the flooding occurred at the beginning and end of the season, which was characterized by a moderate activity, but not in the fall of 2008 which was characterized by high activity, which began with heavy rains in the period from 21st to 26th September, affecting regions in southern and central Spain within: Valencia, Murcia, Andalucia, Extremadura, Castilla-La Mancha, Madrid, which caused severe storms: the swollen rivers, flooding of agricultural areas, loss of crops, flooding towns, loss of commercial and industrial products, damage to roads and electricity. The Communities of Ceuta and Melilla located on the north coast of Africa also suffered the ravages of floods during the period from 27 to September 29, 2008, registering cumulative rainfall above 400 and 100 litres/m2 respectively, which have caused flooding in parts of the city, affecting shopping centres, damaging homes and electricity.
The accumulated rainfall in the Valencia region in the early fall of 2008 were intense in some areas, surpassing the 300 l/m2, in the municipality of Sweden there was a shower of 144 litres per hour. There were only two weeks after heavy rains had left the Valencia Community, but again the cold drop is reflected in the region of North and South Alicante. Valencia causing the overflow of major rivers and flood zones low near the rivers and tributaries, with a rainfall recorded in the swamp of Beniarres in the Alicante province of 200 litres/m2 in 24 hours, for a cumulative value of rainfall in the area of 447 litres/m2 within 72 hours of the bad weather.
The analysis of floods in the fall, winter and spring at one stage considered as wet as it is becoming far the hydrological cycle 2009 – 2010, shows that in different cities and agricultural areas of Spain, the plan of measures adopted for the regulation of excessive water is insufficient, as major floods occurred in many towns, cities and agricultural areas which caused great economic losses, property damage and human losses. Proceeds from the abundant rainfall and insufficient hydraulic works have lost billions of cubic meters of water, and have lost billions of euros by the effect of excessive rainfall, years ago when there were drought we have lost billions of euros due to lack of water, which indicates that the use we make of excessive water is insufficient and need to build more hydraulic works to regulate even more runoff and further transfers carrying water from areas with abundant water resources to areas with water deficit and to enable evacuation of large volumes of water in a short time.
The agriculture is a strategic sector which through major economic and structural problems, it is necessary to develop it so that it becomes more profitable and competitive, capable of absorbing a large amount of labour, to increase exports and development agricultural industrial.
During the period of the Great Depression in the United States in the last century was prioritized the agricultural sector was boosted construction of hydraulic works and irrigation and drainage systems to absorb the same large amount of labour, which allowed in conjunction with other productive sectors more harmonious development of the economy and enabled the country out faster of the economic crisis and improve the profitability of agriculture, so it is important to take into account the experience acquired.