000 03204nam a2200421 4500
005 20260818112531.0
008 100698 th eng
035 _a.b10257135
099 9 _aAIT Thesis no.WA-90-3
100 1 _aAmaraweera, H. B. M. P.
245 1 0 _aEstimation of safe yield in Mannar Island, Sri Lanka
260 _aBangkok :
_bAsian Institute of Technology,
_c1990
300 _a108 p.
490 1 _aThesis ;
_vno. WA-90-3
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1990
520 _aCommercial developments in the island of Mannar in Sri Lanka over the past few years have made estimation of safe yield a very important requirement. But this estimation process is complicated due to the absence of sufficient field data and the occurrence of aquifer as a thin lens floating over saline water. This study is an attempt towards applying approximate solution to analyse this problem. The first approximation of the recharge to the fresh water lens is obtained by a Water Balance Study incorporating Hydrological Budget and Soil Moisture Balance. During the estimation, 36 trials are generated considering the factors influencing soil moisture balance. The recharge estimation done in this part of the study are refined by the analysis of fresh-salt water interface movement. For this purpose, approximate solutions derived by HANTUSH (1968) are used with relevant modification to the study area. An abstraction rate of 1.5 times the present level (1988) is found to be safe on the long term basis. It is also found from this study, that during a drought period, doubling of the present level of abstraction is not undesirable for a limited period of time, but careful monitoring of chloride content of pumped water has to be accompanied.
650 0 _aWater, Underground
_xSri Lanka
700 1 _aGupta, Ashim Das,
_eChairperson
700 0 _aSuphat Vongvisessomjai,
_eExamination Committee
700 1 _aLoof, Rainer,
_eExamination Committee
710 2 _aThe Canadian International Development Agency-A.I.T. Partnership Program.,
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. WA-90-3
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B18581
907 _a.b10257135
_bmnait
_cs
902 _a240401
998 _b2
_c951012
_dm
_ea
_fs
_g0
945 _lmnait
945 _lmnait
945 _lmnarc
942 _c22
942 _c40
942 _c20
909 _aBarcode : 30050120574354
_bCREATED : 2014-01-04
_cRECORD # : i12785027
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
909 _aBarcode : 30050160033998
_bCREATED : 2016-12-02
_cRECORD # : i12881156
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
909 _aBarcode : 30050121028178
_bCREATED : 2022-10-18
_cRECORD # : i13408586
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
999 _c40288
_d40288