Sj\u00f3\u00f0andi vatni\u00f0 \u00ed D\u00f3min\u00edku er jar\u00f0hitaundur \u00e1 heimsv\u00edsu, en sveiflukennd efnafr\u00e6\u00f0i \u00feess felur \u00ed s\u00e9r einstaka \u00e1h\u00e6ttu: \u00f3v\u00e6nt t\u00e6ming og h\u00e6ttuleg gasmengun. \u00de\u00f3 a\u00f0 hef\u00f0bundnar g\u00f6ngulei\u00f0beiningar einbl\u00edni \u00e1 landslag, afk\u00f3\u00f0ar \u00feessi grein sveiflukennda heg\u00f0un vatnsins til a\u00f0 hj\u00e1lpa \u00e6vint\u00fdram\u00f6nnum a\u00f0 for\u00f0ast banv\u00e6n mist\u00f6k. Me\u00f0 \u00fev\u00ed a\u00f0 skilja jar\u00f0hitahringr\u00e1s \u00feess og eiturgas\u00e1h\u00e6ttu getur\u00f0u skipulagt \u00f6ruggari og snjallari lei\u00f0angur.<\/p>\n\n
Sj\u00f3\u00f0andi vatni\u00f0 er ekki st\u00f6\u00f0ugt vatnsb\u00f3l. \u00dea\u00f0 gengur \u00ed gegnum t\u00edmabil \u00fear sem vatn t\u00e6mist \u00e1 \u00f6rskotsstundu, vatnsbor\u00f0 l\u00e6kkar sn\u00f6ggt og stundum s\u00e9st gufandi t\u00f3mur g\u00edgur. \u00deetta gerist \u00feegar jar\u00f0hitakerfi\u00f0 undir yfirbor\u00f0i breytist, oft vegna jar\u00f0skj\u00e1lftavirkni e\u00f0a \u00fer\u00fdstingsbreytinga. Ef \u00fe\u00fa kemur \u00e1 me\u00f0an t\u00e6mingu stendur, er hi\u00f0 einkennandi sj\u00f3\u00f0andi yfirbor\u00f0 horfi\u00f0 \u2013 skipt \u00fat fyrir \u00f3st\u00f6\u00f0ugan gasfylltan dal. A\u00f0 skilja \u00feessa hringr\u00e1s kemur \u00ed veg fyrir vonbrig\u00f0i me\u00f0 \u201e\u00feurra\u201c fer\u00f0 og raunverulega h\u00e6ttu \u00e1 a\u00f0 fara ofan \u00ed eiturholu.<\/p>\n\n
St\u00e6rsta h\u00e6ttan er ekki hitinn \u2013 heldur \u00f3s\u00fdnilegu lofttegundirnar. Brennisteinsvetni (H2S) og koltv\u00eds\u00fdringur (CO2) safnast fyrir \u00ed l\u00e1gum sv\u00e6\u00f0um me\u00f0fram g\u00f6ngulei\u00f0inni, s\u00e9rstaklega \u00ed Ey\u00f0ingardalnum. H2S \u00ed miklum styrk getur lama\u00f0 lyktarskyni\u00f0 og valdi\u00f0 hr\u00f6\u00f0u me\u00f0vitundarleysi. CO2 er \u00feyngra en loft og getur \u00fdtt s\u00farefni \u00far l\u00e6g\u00f0um. A\u00f0 \u00feekkja dalsbotna og vindlausa daga sem \u00e1h\u00e6ttusv\u00e6\u00f0i er nau\u00f0synlegt; \u00feetta eru sta\u00f0ir \u00fear sem lofti\u00f0 ver\u00f0ur \u00f3andanlegt \u00e1n vi\u00f0v\u00f6runar.<\/p>\n\n
Reyndir \u00e6vint\u00fdramenn fylgjast me\u00f0 lit vatnsins og yfirbor\u00f0svirkni. Gr\u00e1leitur bl\u00e1r litur \u00fe\u00fd\u00f0ir venjulegt sj\u00f3\u00f0andi; br\u00fanleitur bl\u00e6r bendir til setr\u00f3fs og hugsanlegs \u00f3st\u00f6\u00f0ugleika. Ef yfirbor\u00f0i\u00f0 vir\u00f0ist \u00f3hugnanlega kyrrt, g\u00e6ti vatni\u00f0 veri\u00f0 n\u00e1l\u00e6gt t\u00e6mingarfasa. Endurfyllingar eru sprengilegar \u2013 vatni\u00f0 getur fyllst \u00e1 n\u00fd me\u00f0 s\u00e6ldu vatni \u00e1 nokkrum m\u00edn\u00fatum og skapa\u00f0 skyndilegan gufu\u00fer\u00fdsting. N\u00e1l\u00e6g\u00f0u aldrei br\u00fanina me\u00f0an \u00e1 endurfyllingu stendur; haltu alltaf a\u00f0 minnsta kosti 20 feta fjarl\u00e6g\u00f0 fr\u00e1 str\u00f6ndinni.<\/p>\n\n
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