QE223 : The feasibility study of storing rainwater in a thin alluvium: A case study in Gazin village, Haftkel, Khozestan
Thesis > Central Library of Shahrood University > Geosciences > MSc > 2014
Authors:
Kobra Sheikh Leiveci [Author], Gholam Abbas Kazemi[Supervisor], [Supervisor]
Abstarct: In most parts of the country, due to unevenness and seasonality of rainfall and scarcity of surface water resources, groundwater resources are extracted for different purposes. Methods of artificial recharge to mitigate water scarcity are cosidered as effective solutions. Different methods of artificial recharge techniques are available and applicability of each method depends upon regions characteristics, such as climate, topography, geology, hydrology, hydrogeology, erosion and sedimentation load of watershed and so on. In this study, due to the lack of space and fine texture of surface soils, the feasibility of storing runoff into injection and recovery well has been investigated. A pilot injection well is located in a dry shallow alluvium, 14 km to the city Haftkel in Khuzestan province. Direct injection of water into the well was done in ten steps and changes in water level during the injection was recorded and then with the use of this changes infiltration rate was calculated. Maximum infiltration rate recorded in steps 7,8 and 10 is 370.63,200.72 and 158.43 cm/h, respectively. For further investigation soil samples were collected from all depths of the well and the texture of each sample was determined according to Folk grain size table. According to grain size, soil generally have three types of texture: muddy sand, sandy gravel and muddy gravelly sand. In the next step, with the particle size distribution curve and empirical formulas such as Kazny- Carmen, Alymany And the Sen, Hazen and etc. Hydraulic conductivity was estimated in all depths of the well. USDA formula is the most appropriate empirical formula for estimating the hydraulic conductivity. According to this formula, horizontal and vertical hydraulic conductivity is estimated 5.076 and 0.00036 m/day, respectively. It should be noted that the maximum hydraulic conductivity of all the formulas is calculated for depth of 10 meters. Maximum changes of infiltration rates were recorded for 10 and 11 meters depth, on average 850 and 791.22 cm / h, both of which have a coarse texture and are included gravel. By analyzing all the data and information, due to lack of sufficient runoff during the study period, the feasibility of storing water in the alluvium can not be definitely known.
Keywords:
#(Shallow alluvium #Injection and recovery well #Infiltration rate #Hydraulic conductivity) Link
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