Case Study 1: Matarraña River Basin - Euwareness

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2. Water uses and demands According to official data, the total net water needed in the Matarraña river basin is calculated as being 17.029 Hm3 per year: 90.4% goes to irrigation; 9.58% is needed for population supply; and 0.01% is consumed by cattle. The main uses of water at the Matarraña river basin include irrigation, population supply and cattle. Among these, irrigation is clearly dominant, as it absorbs 90.4% of the total net water needs. Irrigation 2,166 Ha. 12.094 Hm3 90.4% Source: www.chebro.es Total net water needs per year, Hm3 (from Valderrobles to Fayón) Population supply 10,613 inhab. 1.284 Hm3 9.58% Cattle 631,228 heads 0.245 Hm3 0.01% Total 17.029 Hm3 100% Water used in the Matarraña river basin can be taken directly from the river or from the Pena dam, which is located in Valderrobres. In dry periods, and especially in spring and summer, the river may have low water flows (in the lower basin, the flow of the river may even disappear in extremely dry conditions). As the following table shows (recent data are not available), the annual flows of water at the head of the Matarraña river may vary considerably. Annual flows in the head of the Matarraña river (1985-1994) 1985 23.22 Hm3 1986 28.68 Hm3 1987 63.25 Hm3 1988 79.53 Hm3 1989 71.38 Hm3 1990 119.91 Hm3 1991 66.59 Hm3 1992 58.18 Hm3 1993 25.05 Hm3 1994 31.65 Hm3 1995 ? 1996 ? 1998 ? 1999 ? 2000 ? Source: www.chebro.es 9
In cases of water scarcity, and considering the need to respect the ecological flow (325 l/sec), which represents about the 30% of the average river flow, the river has no water enough to satisfy irrigation, population supply and cattle needs. The Matarraña river, in the gauging station located in its head (municipality of Beceite), reduces 40% of its average flow in July and August, and in 20% in June and September. In the gauging station located in Nonaspe, at the lower river basin, it may reduce 70% of its average flow from June to September. Most of the water used in the Matarraña river basin is taken from the Pena dam. The Pena dam was built in 1930 and has a total capacity of 17.88 Hm3. However, two considerations must be taken into account when considering this data. On the one hand, the Pena dam, due to geological factors, may filter up to 3.75 Hm3/year at least and, as some studies point out, it can only regulate 8.5 Hm3 per year. On the other hand, the quantity of water stocked in the Pena dam depends on climatic conditions. While the rains in 1988 allowed for the filling up of almost an 80% of the dam, in summer 1994 the dam was filled up with 42% of its capacity, and one year later just with 26% (Moragrega, 2000). In September 1998, one of the driest periods in recent years, the Pena dam contained about 13% of its total capacity. Then it released 0.9 Hm3 water for irrigation, and left the 1.5 Hm3 minimum reserved for population supply. The following table shows the mentioned evolution of the quantity of water stored in the Pena dam for a ten years period starting in 1988. Water stored in the Pena Dam (1988 – 1998)* Year Hm3 % 1988 15 78 1989 17 89 1990 14 73 1991 16 84 1992 18 95 1993 15 79 1994 8 42 1995 5 26 1996 5 26 1997 9 47 1998 4 21 *From data collected in July Source: Heraldo de Aragon (26 th July, 1998) 10
Page 1 and 2: euwareness spain Case Study 1: Mata
Page 3 and 4: Index Introduction 1. Case demarcat
Page 5 and 6: 1. Case demarcation The Matarraña
Page 7 and 8: Even though the Matarraña river ba
Page 9: Nowadays, due to the problems of wa
Page 13 and 14: The production of peaches has consi
Page 15 and 16: Industry Annual net needs for cattl
Page 17 and 18: problem of which is water supply gu
Page 19 and 20: 3. Regulative system and de facto u
Page 21 and 22: Concessions can be: Central users c
Page 23 and 24: Mazaleón Maella Fabara Nonaspe Ari
Page 25 and 26: Use rights and practices Some uses
Page 27 and 28: circumstance, the irrigation commun
Page 29 and 30: Both the dominance of the middle ba
Page 31 and 32: water. Some measures have been take
Page 33 and 34: and the Central Government. Apart f
Page 35 and 36: The regional government of Aragon (
Page 37 and 38: Within the Central Union, the irrig
Page 39 and 40: Experts Independent experts, mostly
Page 41 and 42: Local governments Central Union Irr
Page 43 and 44: Aug - Adoption of the 29/85 Water A
Page 45 and 46: Subphase 1: 1902 - 1930 First regul
Page 47 and 48: continue to be constructed all over
Page 49 and 50: epresents the emergence of a social
Page 51 and 52: of the affected by the expropriatio
Page 53 and 54: Meanwhile, meetings held between th
Page 55 and 56: Torre del Compte Dam Location High
Page 57 and 58: While the CHE still waited for a re
Page 59 and 60: Claims for water supply for irrigat
Page 61 and 62:
Dimensions of integrated governance
Page 63 and 64:
Regarding the regulative system, bo
Page 65 and 66:
8.2. Towards sustainability? The ex
Page 67 and 68:
REFERENCES ARROJO, P.; GRACIA, J.J.
Page 69:
EUWARENESS is a research project on
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