Na počátku 20. století po katastrofálních povodních z minulých 50 let (1897 nejhorší) bylo v oblasti Jizerek postaveno několik nádrží jako ochrana před povodněmi. Kamenné hráze profesora Otto Intzeho jako by jedna druhé z oka vypadly a slouží dodnes (Harcov, Mlýnice, Fojtka, Bedřichov - Černá Nisa, Jablonec n. N.). Sypaná hráz Protržené přehrady na Bílé Desné se v roce 1916 se protrhla a způsobila katastrofu ... Některé přehrady se po téměř 100 letech staly přirozenou součástí zdejší krajiny. Zde fotky klasické - pozemní.
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