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        "date_updated":"2025-11-27T09:46:03.046000",
        "title_en":"Svelvikstr\u00f8mmen",
        "title_no":"Svelvikstr\u00f8mmen",
        "description_en":"<p>Svelvikstr&oslash;mmen has a single navigable channel. The depth in the dredged channel is 11 meters, and the bottom width is 100 meters. The channel is well marked with leading lights and buoys.</p>\n<p>The current is influenced by the tide, the freshwater inflow into Drammensfjorden, and the weather's effect on water levels. The tide causes an inward current on rising water and an outward current on falling water. The current will reverse when it is high tide/low tide inside the fjord (about one hour later than outside the fjord). This pattern can be altered by the freshwater inflow, primarily from the Drammenselva river, which causes a brackish water current out of the fjord, making the period of outgoing current longer than the period of incoming current. During low pressure and wind from the SW in Skagerrak, the water can be pushed up, and the current may flow into the fjord throughout the day, regardless of the tide.</p>\n<p>During high pressure and wind from the N and E, the current may flow out throughout the day. The outgoing current can reach up to about 5 knots, and the incoming current can reach up to about 2-3 knots. The incoming current is strongest on the E side, and eddies may form. Usually, it is easiest to pass through the current a little before high tide, when the water level is highest, and the current is minimal.</p>\n<p>All vessel traffic should, well in advance of passing through Svelvikstr&oslash;mmen, inform other vessels of their passage time on VHF channel 19, so that necessary precautions can be taken. Similarly, vessels should listen on VHF channel 16 well before and during passage through the current.</p>\n<p>Smaller vessels are then obliged to move aside until the deep-draft vessel has passed. Otherwise, the navigation rules apply.&nbsp;</p>\n<p>In Svelvikstr&oslash;mmen, within a sea area bounded to the north by a straight line drawn 090&deg; from Blindeskj&aelig;r light and to the south by a straight east-west line through the southern light of S&oslash;ndre Svelvikrenna, a speed limit has been introduced.</p>\n<h3>Regulations&nbsp;</h3>\n<p>Regulations on the use of the Vessel Traffic Service areas and specific waterways (Sj&oslash;trafikkforskriften), FOR-2015-09-23-1094 concerning permission to use the waterway and capacity limitations. Chapter 3. Sailing rules in specific waterways. See lovdata.no to read the full regulation.</p>",
        "description_no":"<p><a href=\"ssr:328756\" data-county=\"Akershus\" data-lat=\"59.61014\" data-lng=\"10.4111\" data-municipality=\"Asker\" data-type=\"Sund i sj&oslash;\">Svelvikstr&oslash;mmen</a>&nbsp;har ett fartsl&oslash;p. Dybden i den mudrede rennen er 11 m og bunnbredden 100 m. L&oslash;pet er godt merket med overettlykter og staker.</p>\n<p>Str&oslash;mmen er p&aring;virket av tidevannet, ferskvannstilf&oslash;rselen til&nbsp;<a href=\"ssr:792266\" data-county=\"Akershus\" data-lat=\"59.66667\" data-lng=\"10.39167\" data-municipality=\"Asker\" data-type=\"Fjord\">Drammensfjorden</a>&nbsp;og v&aelig;ret sin virkning p&aring; vannstanden. Tidevannet f&oslash;rer til en str&oslash;m innover p&aring; stigende vann og utover p&aring; fallende vann. Str&oslash;mmen vil snu n&aring;r det er h&oslash;yvann/lavvann inne i fjorden (ca en time senere enn utenfor fjorden). Dette m&oslash;nsteret kan endres av ferskvannstilf&oslash;rselen, i f&oslash;rste rekke fra&nbsp;<a href=\"ssr:548370\" data-county=\"Buskerud\" data-lat=\"59.74074\" data-lng=\"10.20748\" data-municipality=\"Drammen\" data-type=\"Elv\">Drammenselva</a>, som for&aring;rsaker en str&oslash;m av brakkvann ut av fjorden slik at perioden for utg&aring;ende str&oslash;m er lengre enn perioden for inng&aring;ende str&oslash;m. Ved lavtrykk og vind fra SW i Skagerrak kan vannet stues opp og str&oslash;mmen kan g&aring; inn i fjorden hele d&oslash;gnet, uavhengig av tidevannet.</p>\n<p>Ved h&oslash;ytrykk og vind fra N og E kan str&oslash;mmen g&aring; ut hele d&oslash;gnet. Utg&aring;ende str&oslash;m kan komme opp i ca 5 knop, og inng&aring;ende str&oslash;m kan komme opp i ca 2-3 knop. Den inng&aring;ende str&oslash;mmen er kraftigst p&aring; E siden, og det kan danne seg virvler. Vanligvis er det lettest &aring; passere str&oslash;mmen litt f&oslash;r h&oslash;yvann, da er det h&oslash;yest vannstand og lite str&oslash;m.</p>\n<p>All skipstrafikk skal i god tid f&oslash;r passering av&nbsp;<a href=\"ssr:328756\" data-county=\"Akershus\" data-lat=\"59.61014\" data-lng=\"10.4111\" data-municipality=\"Asker\" data-type=\"Sund i sj&oslash;\">Svelvikstr&oslash;mmen</a>&nbsp;informere andre fart&oslash;yer om sin passeringstid p&aring; VHF kanal 19, slik at disse kan ta n&oslash;dvendige forholdsregler. Likeledes skal det lyttes p&aring; VHF kanal 16 i god tid f&oslash;r og under passering av str&oslash;mmen.</p>\n<p>Mindre fart&oslash;yer har da plikt til &aring; holde til siden inntil det dyptg&aring;ende fart&oslash;yet har passert. For &oslash;vrig gjelder sj&oslash;veisreglene.&nbsp;</p>\n<p>I&nbsp;<a href=\"ssr:328756\" data-county=\"Akershus\" data-lat=\"59.61014\" data-lng=\"10.4111\" data-municipality=\"Asker\" data-type=\"Sund i sj&oslash;\">Svelvikstr&oslash;mmen</a>, innenfor et sj&oslash;omr&aring;de avgrenset i nord av en rett linje trukket 090&deg; fra&nbsp;<a href=\"ssr:913633\" data-county=\"Buskerud\" data-lat=\"59.62353\" data-lng=\"10.41287\" data-municipality=\"Drammen\" data-type=\"Fyrlykt\">Blindeskj&aelig;r lykt</a>&nbsp;og i syd av en rett linje &oslash;st-vest gjennom&nbsp;<a href=\"ssr:630188\" data-county=\"Akershus\" data-lat=\"59.59607\" data-lng=\"10.42216\" data-municipality=\"Asker\" data-type=\"Fyrlykt\">S&oslash;ndre Svelvikrenna</a> s&oslash;ndre lykt, er det innf&oslash;rt fartsbegrensning.</p>\n<p>&nbsp;</p>\n<h3>Restriksjoner</h3>\n<p>Forskrift om bruk av sj&oslash;trafikksentralenes tjenesteomr&aring;de og bruk av bestemte farvann (Sj&oslash;trafikkforskriften), FOR-2015-09-23-1094 vedr&oslash;rende tillatelse til &aring; benytte farvannet og kapasitetsbegrensninger. Kapittel 3. Seilingsregler i bestemte farvann. Se lovdata.no for &aring; lese hele forskriften.</p>",
        "caution_en":"<p>NB; the ferry Svelvik-Verket crosses Svelvikstr\u00f8mmen just N of Verks\u00f8ya. The ferry has VHF on board.</p>",
        "caution_no":"<p>Ferjen Svelvik-Verket krysser Svelvikstr&oslash;mmen rett N for <a href=\"ssr:267731\" data-county=\"Akershus\" data-lat=\"59.61134\" data-lng=\"10.41414\" data-municipality=\"Asker\" data-type=\"&Oslash;y i sj&oslash;\">Verks&oslash;ya</a>. Ferjen har VHF ombord.</p>"
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