Jurong Island groundwater study : hydrological and hydraulic investigations

• Main Author: Wong, Shao Jie.
• Other Authors: Shuy Eng Ban
• Format: Final Year Project
• Language: English
• Published: 2013
• Subjects: DRNTU::Engineering
• Online Access: http://hdl.handle.net/10356/53822
• Institution: Nanyang Technological University

Groundwater which is found in Jurong Island would become a new water resource for future Singapore. A pilot test study was carried out on Jurong Island mainly in reclaimed area from August to October 2010. Researches which were done with some assumptions made in previous studies aimed to understand the characteristics and behaviours of each parameter under different kind of situations. This project aims to be a continued study to provide supportive background researches for future on-site practice, rather than rough assumptions are made. By using the measured data from pilot test, natural infiltration percentage is estimated in a range of 29%-62% by water fluctuation method. Due to some assumed uncertainties and data from other landuse, the conservative range is used from 30%- 50%. Subsequently, a series of well yields in different well diameters (2m to 2.2m) as well as RD (Min RD = 221.8 m), the ridge radiuses are estimated based on conservative natural infiltration before sea water intrusion occurs. Moving forward a single step of the research, total yearly sustainable well are 17.6 x 106 m3/year (30% infiltration percentage) and 30.1 x106 m3/year (50% infiltration percentage). The yield reliability is always 90% and above if the intended withdrawals do not exceed percentage (30-50%) of volume of water infiltrate into the aquifer. An abstraction system of Dug well (at a relatively deeper aquifer) together with radial well or infiltration gallery (around the lake shore) is suggested to apply on site. It is recommended that a test would be conducted with these parameters and analyzed data for example using 2.3 l/s maximum pumping rate for a 2m diameter well (maximum pumping rate at the worst dry month) throughout whole year (12 months) to justify the results obtained in this project.