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19882
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Subject: Agricultural Engineering Ɨ End date: 1989 Ɨ Start date: 1983 Ɨ Type: Thesis Ɨ Thesis Type: M.Tech. Ɨ
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    ThesisItemOpen Access
    Water balance study of Karuvannur river basin
    (Department of Irrigation and Drainage Engineering, Kelappaji College of Agricultural Engineering and Technology, Tavanur, 1988) Santosh, G Thampi; KAU; John Thomas, K
    This study was undertaken to quantitavely assess the water resources of the Karuvannur River Basin and to study the monthly water balance in order to estimate the balance for ground waterrecharge or depletion during the period 1976 to 1985. The mean monthly rainfall over the basin during the period 1976-1985 was determined by Thiessen polygon method . Data regarding the amount of water released for irrigation from the Peechi reservoir was also collected. Due to lack of data, contribution from other sources was not taken into account. The total runoff from the basin during each month of this period was determined . The various crop combinations in the basin were identified and the area under each of these was estimated . The actual evapotranspiration during each month was estimated using the method outlined by Doorenbos and Kassam. The basin was regarded as an independent hydrologic unit . Hence surface and subsurface inflow and outflow were assumed to be negligible.
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    ThesisItemOpen Access
    Sea water intrusion studies for coastal aquifers
    (Department of Irrigation and Drainage Engineering, Kelappaji College of Agricultural Engineering and Technology, Tavanur, 1988) Saley, Abraham; KAU; .John Thomas, K
    Studies were conducted in three villages along the coastal areas of Trichur district, namely, Nattika, Talikulam and Edamuttam, to know the extent of sea water intrusion through aquifers. Observations were made in existing wells along an alignment normal to the coast line. Aquifer parameters and fresh water flow through the aquifer were computed making use of borehole data available for the region. The positions of the interfaces were determined using established formulae. The possible shifting of the interfaces due to reduction In fresh water discharge consequent to future increased rate of pumping was predicted. In each village, -three wells were taken for the study purpose. In all the cases, the maximum rates of pumping for various depths of wells, which will not cause sea water intrusion problems, have been deterĀ¬mined. Chemical analysis showed that, at present there was no salt water intrusion in the wells under study. The results of the present study lead to a better understanding of the sea water intrusion problem, the determination of the position of the interfaces for various pumping rates might be effectively used in fixing the location of wells, pumping rates and depth of wells. The study would be made use of designing a ground water system in coastal areas for a better utilisation of ground water resources.