Detail The Ups and Downs of Dams   Oleh:  [s.n] Jenis: Article from Bulletin/Magazine Dalam koleksi: The Economist (http://search.proquest.com/) vol. 395 no. 8683 (May 2010), page 13-16. Topik: Water Resources; Public Policy; Agriculture; Dams Ketersediaan Perpustakaan Pusat (Semanggi) Nomor Panggil: EE29.63 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada     Lihat Detail Induk Isi artikel The trouble with water is that it is all politics, no economics. The costs of poor management are large. Rich countries build sewers, drains, dams, reservoirs, flood defences, irrigation canals and barrages to avoid such problems. Poor countries, with some exceptions, notably China, find large projects much more difficult. But at least large projects give politicians a monument to boast about. Small projects--weirs and wells and waterworks--have no allure for big-headed politicians. That is a pity. A small dam is relatively cheap to construct: modest reservoirs known in India as tanks used to be built and maintained by local villagers. For a millennium they provided water in times of need and helped make rulers like the nizams of Hyderabad some of the richest men in the world. Now they are often silted up, polluted with pesticides, metals and phosphorus, or built on. In Kenya, by contrast, small dams are coming into fashion. Rainwater is channelled into sand catchments, which serve both to filter it and to protect it from evaporation. Some goes into nearby soil, for crops, some into groundwater from which it can later be recovered. In Niger a 15-year project involving dams and reclamation has restored nearly 20,000 hectares of unproductive land to forestry or agricultural use. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Kembali

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