Impact of small dams on agriculture and groundwater development: A case study from Pakistan

• Autores: Muhammad Ashraf, Muhammad Akram Kahlown, A. Ashfaq
• Localización: Agricultural water management: an international journal, ISSN 0378-3774, Vol. 92, Nº. 1-2, 2007, págs. 90-98
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Water resources development and management is imperative for sustainable agriculture in water scarce areas. In Pakistan, the state of Punjab has constructed 32 small dams, in the Pothwar region, to store and conserve water for agricultural production. However, little information is available on the impact of these small dams on agriculture and socio-economic conditions of the area. This study was undertaken to evaluate the impact of three small dams, Jawa, Kasala and Dhok Sanday Mar, on agriculture and groundwater development in the area and to provide guidelines for the effective utilization and sustainable management of small dams in Pakistan. Data related to on-farm practices were collected during personal interviews using a pre-tested questionnaire. Water-table depth was measured from the open wells in the area with a water-table recorder. Secondary data such as inflow, outflow, rainfall, water charges and land use were collected from small dams organization.

    After the construction of these dams and irrigation canals, cropping intensity and crop yield have increased. Due to availability of irrigation water there has been a shift of cropping pattern from wheat and forage crops to vegetable crops. Farmers are earning up to $2433 per ha per year. An analysis of inflow�outflow of the dams shows that, if properly managed, the storage is sufficient to irrigate all the crop lands within the command area. The depth to the water table has also decreased since the dams were constructed. The water table varies from 6 to 15 m in the irrigated areas served by the Khasala dam as compared to 7�39 m before the dam was constructed. The water table depths for the areas served by the Jawa dam ranged from 7 to 39 m before the dam was constructed to 9�25 m after construction. The shallower water table has made the groundwater accessible and as a result the number of wells has increased. This has reduced drudgery on the local inhabitants particularly for women who had to fetch water from far away for their domestic uses The area has potential for expanding both land use and cropping intensities, if innovative irrigation and agronomic practices are adopted. Moreover, mobilizing local water user associations, proper maintenance of irrigation infrastructure and technical support of the agricultural and extension services can enhance the productivity in the area