Sains Ma1aysiana 27: 61-71 (1998)                                                                                               Sains Bumi/

                                                                                                                                                                Earth Sciences

 

Groundwater Characteristic of the Chuau River

Basin Selangor, Malaysia

 

 

Mohd Nazan Awang

Pengarah Kajibumi Negeri Se1angor & Wilayah Persekutuaan

Tingkat 19, Bangunan Tabung Haji, Jalan Tun Razak 50736, Kuala Lumpur

 

Muhamad Barzani Gasim

Jabatan Sains Sekitaran, Fakulti Sains Alam Sekitar

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, D.E

 

Wan Nor Azmin Sulaiman

Jabatan Sains Alam Sekitar, Fakulti Sains Dan Pengajian A1am Sekitar

Universiti Putra Malaysia, 43400 Serdang, Selangor, D.E

 

 

ABSTRACT

 

A new Putrajaya township of Malaysian government administration centre is located in the middle of Chuau River basin. Previously this area was partly covered by a forest reserve, rubber and oil palm plantations, coconut trees, quarries and tin mines. The catchment area which is about 125 km2 consists of three main rock formations, i.e. the Hawthornden Schist (older), the Kenny Hill Formation, and the Quaternary deposit (younger). The topography of this area consists of scattered hills and swamps. There is no proper drainage pattern in the study area, and the stream flow is controlled by the season. Quality and quantity of groundwater have been studied from eleven wells in the study area. The depth of each well is between 6 - 7 m (for alluvium) and 60 - 137 m (for rock unit). The total water yield is 1824 m3/ day or equivalent to 0.4 x 106 gallons/day. The water quality analysis shows that groundwater is not suitable for drinking due to its chemical and physical contents, such as mercury (< 0.2 - 2.7 ppm), ferrum (< 0.1 - 10 ppm), silica (8.9 - 56 ppm), hardness (7.5 - 143 ppm), and total dissolved solid (70 - 776 ppm). These values exceed the international standard for drinking water. Finally, groundwater facies classification based on anion and cation contents such as Ca2+, Mg2+, Na+, K+, CO32-, HCO3-, Cl- and SO42- , shows that there are at least 2 groups of groundwater facies in the study area, namely: sodium bicarbonate and calcium bicarbonate.

 

ABSTRAK

 

Putrajaya adalah pusat pentadbiran Kerajaan Malaysia yang baru, terletak di tengah-tengah lembangan Sungai Chuau. Sebahagian kawasan ini pada mulanya merupakan kawasan hutan simpan, ladang getah, ladang kelapa sawit dan sebahagiannya adalah kawasan lombong timah dan kuari. Kawasan tadahan hujan yang mempunyai keluasan 125 km2 dibentuk oleh tiga kumpulan batuan yang utama, iaitu Syis Hawthornden (tertua), Formasi Kenny Hill dan Endapan Kuaterner (termuda). Topografi kawasan terdiri daripada bukit-bukit yang terasing dan kawasan berpaya. Bentuk pola salirannya tidak begitu jelas, dan anak-anak sungainya mengalir mengikut musim. Kualiti dan kuantiti air bawah tanahnya dikaji berdasarkan kepada taburan 11 lubang gerudi yang ada dalam pelbagai batuan dalam kawasan kajian. Kedalaman setiap lubang gerudi adalah diantara 6-7 m (bagi aluvium) dan 60-137 m (bagi batuan). Keupayaan air bawah tanah yang dapat dikeluarkan dalam kawasan kajian ialah sebanyak 1824 m3/ hari atau bersamaan dengan 0.4 x 106 gallon/hari. Hasil analisis secara kimia dan fisikal terhadap aspek kualiti air menunjukkan bahawa air bawah tanah di sini adalah tidak selamat untuk terus diminum, memandangkan terdapatnya kandungan beberapa jenis logam berat yang tinggi dan membahayakan kesihatan, seperti: raksa (< 0.2-2.7 ppm), besi (< 0.1 - 10 ppm), silika (8.9-56 ppm), kekerasan (7.5-143 ppm), kandungan kelodak (70-776 ppm). Kandungan parameter yang disebutkan di atas adalah tinggi dan merbahaya bagi kesihatan, kerana melebihi kandungan piawaian antara bangsa bagi air minuman. Akhirnya, pengkelasan fasies air bawah tanah berdasarkan kandungan kation dan anion, seperti Ca2+, Mg2+, Na+, K+, CO32-, HCO3-, Cl- dan SO42- menunjukkan bahawa sekurang-kurangnya terdapat 2 kumpulan fasies utama dalam kawasan kajian, iaitu sodium bikarbonat dan kalsium bikarbonat.

 

 

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