majid khazayi; Iman Saleh; reza bayat; Shokr allah Absallan
Abstract
The concept of water productivity is to produce the best and most products by spending the lower amount of water. in this study water productivity was investigated with field surveys, field measurements and remote sensing analysis. For this purpose, in the first stage, water resources condition of the ...
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The concept of water productivity is to produce the best and most products by spending the lower amount of water. in this study water productivity was investigated with field surveys, field measurements and remote sensing analysis. For this purpose, in the first stage, water resources condition of the Basht aquifer investigated. in the next step, the cultivated area of Basht aquifer was investigated using Sentinel-2 satellite images in Google Earth Engine. Then, the agricultural condition of the aquifer investigated through questionnaire by farmers and experts. In the next step, the water requirement of the current cultivation pattern was calculated by the Penman-Monteith method. Finally, by evaluating the products in terms of productivity indicators, the water productivity of different products was determined. Penman-Monteith method calculations indicated that the water requirements of the aquifer dominant crops, including Citrus fruits, wheat, barley, corn, rapeseed, watermelon, branches, legumes and alfalfa respectively were 9170, 5630, 4821, 7863, 5411, 9291, 20234, 5225, 14083 cubic meters per hectare, respectively. In total, the amount of water consumed by the agricultural products in aquifer Basht is 45 million cubic meters, that approximately equivalent to 1 cubic meter per square meter of the aquifer cultivation area and and this amount is much more than the aquifer agriculture programmable water (17 million cubic meters).
Parviz Garshasbi; Davood Ghorbanpour
Abstract
Soil erosion is one of the critical issues in Iranian watersheds. There are fewer quantitative economic analysis of soil conservation practices effects in Iran. Economic evaluation of soil conservation activities is difficult due to the effect of combined indices and lack of market economic value. In ...
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Soil erosion is one of the critical issues in Iranian watersheds. There are fewer quantitative economic analysis of soil conservation practices effects in Iran. Economic evaluation of soil conservation activities is difficult due to the effect of combined indices and lack of market economic value. In this research, the effects of soil conservation practices are analyzed using Net Present Value (NPV) method in Mian Bishe Sub-basin of Taleghan Watershed in Alborz Province, Iran. This sub-basin was selected due to acceptable period of soil conservation practices for analysis and its technical evaluation experiences. First, basic data were updated using GIS, field survey and identification and measurement of benefit and cost indices. Then, economic value of three main cost indices and six combined benefit indices were identified and computed. Economic indices, including NPV and benefit-cost ratio were estimated by integrating available data. Evaluations show that rehabilitation of Main Bishe Sub-basin in a 30 years period with a discount rate of 15 percent has economic justification in lands with comparative productivity, including mountainous rangelands and hilly badlands with high rate of soil erosion and positive NPV. Also, 25 percent of the total benefits comes through onsite, 55 percent through down streams and 20 percent through neighboring sub-basins and due to reduced flooding risk.
