Your search found 3 records
1 Humayun, I. A.; Ahmad, M.; Khalil, M.; Ahmad, R. 1992. Plan for rehabilitation and improvement of Karezes in Balochistan: Main report. Vol.1. Pakistan: Pakistan Water & Power Development Authority. [vi], 101p. (P&I publication no.375)
Irrigation systems ; Rehabilitation ; Irrigated farming ; Gravity flow ; Development plans ; Research ; Economic aspects ; Agriculture / Pakistan / Balochistan
(Location: IWMI-HQ Call no: 631.7.7 G730 HUM Record No: H012778)
2 Humayun, I. A.; Ahmad, M.; Khalil, M; Ahmad, R. 1992. Plan for rehabilitation and improvement of Karezes in Balochistan: Individual Karez report. Vol.II. Pakistan: Pakistan Water & Power Development Authority. [ii], 513p. (P&I publication no.375)
(Location: IWMI-HQ Call no: 631.7.7 G730 HUM Record No: H012779)
3 Humayun, I. A.; Ahmad, M. 1993. Effects of Karez improvements and future development plan in Balochistan. In Government of Pakistan-USAID Irrigation Systems Management Research Project; IIMI, Proceedings: Irrigation Systems Management Research Symposium, Lahore, 11-13 April 1993. Vol.VIII. - Irrigation systems outside the Indus Basin. pp.1-19.
(Location: IWMI-HQ Call no: IIMI 631.7.8 G730 IIMI Record No: H012916)
In Balochistan, karez (sloping tunnel) is a very old source of groundwater supply which does not use external energy. This gravity flow system has, in fact, served as a life-line for the region's domestic and irrigation water supply. With intensive installation of tubewells and power driven pumps in the open dugwells and the absence of recharging facilities, the groundwater balance has been disturbed in many parts of the province. The high cost of cleaning and deepening the karez tunnels and access wells to tap deeper aquifer poses serious maintenance constraints. As a result, the performance of the karez has been badly affected and its flow has considerably decreased and, in many cases, ceased. On an experimental basis, WAPDA rehabilitated and improved representative karezes in different areas of the province. As a result of the encouraging findings of these research studies, which enhanced the karez flows five times with a reduced maintenance cost, the Government of Balochistan requested WAPDA to prepare a comprehensive plan for rehabilitation and improvement of all karezes (about 1000) in Balochistan. To identify various problems under similar conditions, Balochistan Province was divided into three regions, namely, Quetta, Loralai and Mekran. Twenty-six sample karezes were studied in detail to form a plan for their improvement and rehabilitation. Data collection, surveys and investigations were carried out in individual karezes according to a comprehensive program prepared based on research already carried out. The data was evaluated to plan necessary improvements and rehabilitation treatments. The required improvements, in priority order, are tunnel cleaning (88%), capping of access wells(100%), tunnel lining (69%), additional branch karezes (65%), tunnel deepening (19%), storage tank lining (46%), open channel lining (35%), deep boring in karez wells (30%), low retention dams (50%), flood protection (23%) and recharge reservoirs (15%). Further evaluation indicates that the proposed improvements are economically viable. It is recommended that the proposed Karez implementations should be carried out in two phases (one short-term, one long-term) and should involve the water users in sharing the cost as far as possible.
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