Water Conservation of Qanat, using Optimum use of Water in Unused Seasons (Case study: Dehraz Qanat of Sabzevar)
2014
Dadrasi Sabzevar, Abolqasem | Abbasi, Ali Akbar | Ghafuriyan, Reza | Baqeriyan Kalat, Ali | Esmaieliyan, Hoseyn Ali
Protection of water resources is a research priorities in Water Resources Management Company of Khorasan e Razavi province. Using optimum use of qanat water in unused seasons is a method for protection. The main objective of present study is, identify ways to optimize the use of qanat water. In order to meet this general objective, the qanat of Dehraz qanat of Sabzevar was selected, because of high discharge and low annual changes in water flow. The three criteria are evaluated. 1. Save water in to qanat or a pool, 2. Multipurpose use of water and 3. Using plants with the water requirement in non-crop season or planting in the greenhouse. All statistics, data and maps were collected and after a fieldwork and office studies, the exact amount of surplus water was measured. To do the necessary tests, several water samples were taken and water temperature, Ec, pH, Cautions (Ca2+ , Mg2+ , Na+ , K+ ), Anions (Co32-, HCO3- , CL- , SO42- ), No3, DO, SAR, TDS, Total Count, M.P.N, BOD5 (Biological Oxygen Demand) and C.O.D (Chemical Oxygen Demand) of samples were measured in laboratory. Also 3 soil sample were taken for evaluation of physicochemical properties of soil. For consolidation and shear tests, geotechnical studies were performed with a drilling depth of 25 m. Finally in order to study the stability of construction of qanat, a geological and geomorphologic survey was conducted. The results show that there are 141000 m3/year surplus water which are suitable for drinking, nurture of aquaculture, planting in the greenhouse and irrigation. As well as there is a suitable area for storage pool water, although there is no possibility of water storage, into qanat.
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