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~ Waduk PLTA Riam Kanan Di Keduk

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~ Waduk PLTA Riam Kanan Di Keduk


 Waduk PLTA Riam Kanan Dikeruk
 
PLTA Riam Kanan di Kabupaten Banjar, Kalsel.

Untuk mengantisipasi tingginya air di waduk, Perusahaan Listrik Tenaga Air (PLTA) Riam Kanan mulai mengeruk lokasi limpahan air sepanjang 500 meter.

Sedang lokasi limpahan yang dikeruk bertempat di Desa Tiwingan Lama Kecamatan Aranio Kebupaten Banjar, Kalsel. Pengerukan ini sebagai antisipasi tinggi waduk yang melebihi level 63 meter.

Menurut petuas di PLTA Riam Kanan, Alamsyah pengerukan ditargetkan selesai satu minggu ke depan.

Waduk PLTA Ir PM Noor (Riam Kanan) dibangun dengan desain untuk melayani 3 buah turbin franchise berkapasitas 3 x 10 MW dengan rated head sebesar 39,8 meter. Batasan operasi elevasi air waduk/Duga Muka Air (DMA) Waduk Riam Kanan adalah 53,00 m dan 59,86 meter. Dibnawah angka 53,00 meter maka turbin PLTA Riam Kanan sama sekali tidak boleh dioperasikan dan diatas angka 59,86 meter maka air waduk akan mulai melimpas/spill out.

Pelimpasan ini sangat penting bagi keamanan dan keselamatan istalasi PLTA Riam Kanan sendiri, terutama keamanan bendungan/dam-nya. Dam PLTA Riam Kanan adalah dam berjenis urugan tanah/earth fill yang dipadatkan, dimana permukaan di bagian hulu/upstream-nya dilapisi dengan urugan batu gunung/rip rap dan di bagian hilir/downstream-nya ditutup dengan tanaman rumput sebagai penguat dan penahan air.

Apabila waduk tidak didesaian untuk dapat melimpas, apabila terjadi hujan yang terus-menerus dalam jangka waktu yang lama maka DMA waduk akan terus meningkat dan dalam kondisi ekstrim (tapi bukan berarti tidak mungkin) seluruh badan bendungan/dam akan terendam air. Apabila hal ini terjadi maka dam akan menjadi lunak dan bebrapa waktu kemudian dam akan bobol/jebol. Mengingat volume waduk Riam Kanan  sebesar 772 juta meter kubik maka akan terjadi bencana banjir besar yang melanda wilayah kota Martapura dan Banjarbaru..! Tidak terbayangkan korban jiwa dan harta yang akan timbul.

MARTAPURA,
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