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- Ogof_Hesp_Alyn abstract "Ogof Hesp Alyn (Welsh for: Dry Alyn Cave) was discovered by North Wales Caving Club in 1973 in the Alyn Gorge near Cilcain, Flintshire, Wales. Reaching the end of the cave is a serious commitment involving 24 pitches, most requiring specialist single rope technique equipment, and the draining of two sumps. A perpetual siphon is in place at the first sump which does a good job of keeping the water level relatively low, when working properly. Despite its relatively short length, Ogof Hesp Alyn is an interesting cave, well worth a visit for the experienced caver, with much variety and plenty of interesting passage to see.A BCRA grade 5b survey of the cave exists that was created by North Wales Caving Club in two phases, in periods during the original 70s exploration, and further exploration beyond the sumps in the 80s.As well as the main passage that meanders through the cave there are several interesting detours including the Northeast Chambers, the Mousetrap series and the Wormway, which gets its name from the numerous worms that live in the sediment.Much of the cave is wet and muddy, with the entrance series setting the theme for what is to come later on.With more recent discoveries, the length of cave passage totals 2 kilometres (1.2 mi) extending over a vertical range of about 90 metres (300 ft). The entrance would have functioned as a rising prior to the lowering of local water levels by mine drainage. As drainage only took place in the early 20th century, Ogof Hesp Alyn provides a valuable opportunity to study a cave system developed almost entirely by a phreatic processes which remains largely unmodified by vadose streams.Despite the drainage that now occurs down to the Milwr Tunnel which is several hundred feet below, during periods of intense wet weather the cave can fill completely with water. This is quite rare but any visitor should take care. When the water level recedes, the 'Sand Crawl' can still remain a sump for weeks later.It lies close to another cave, Ogof Hen Ffynhonnau, which lies about 150 metres (160 yd) further upstream in the Alyn Gorge. These two caves with Ogof Nadolig form the caves part of the Alyn Valley Woods and Alyn Gorge Caves SSSI.".
- Ogof_Hesp_Alyn depth "98.0".
- Ogof_Hesp_Alyn length "1372.0".
- Ogof_Hesp_Alyn location Alyn_Gorge.
- Ogof_Hesp_Alyn location Flintshire.
- Ogof_Hesp_Alyn location Wales.
- Ogof_Hesp_Alyn wikiPageExternalLink www.ccw.gov.uk.
- Ogof_Hesp_Alyn wikiPageExternalLink hesp.php.
- Ogof_Hesp_Alyn wikiPageExternalLink Oha.jpg.
- Ogof_Hesp_Alyn wikiPageExternalLink www.northwalescavingclub.org.uk.
- Ogof_Hesp_Alyn wikiPageID "3048143".
- Ogof_Hesp_Alyn wikiPageRevisionID "581378953".
- Ogof_Hesp_Alyn access "contact North Wales Caving Club".
- Ogof_Hesp_Alyn discovery "North Wales Caving Club 1973".
- Ogof_Hesp_Alyn geology Limestone.
- Ogof_Hesp_Alyn gridRefUk "SJ 19506570".
- Ogof_Hesp_Alyn hasPhotoCollection Ogof_Hesp_Alyn.
- Ogof_Hesp_Alyn hazards "liable to flooding".
- Ogof_Hesp_Alyn latD "53.18233".
- Ogof_Hesp_Alyn location Alyn_Gorge.
- Ogof_Hesp_Alyn location Flintshire.
- Ogof_Hesp_Alyn location Wales.
- Ogof_Hesp_Alyn locationPublic "yes".
- Ogof_Hesp_Alyn longD "-3.205968".
- Ogof_Hesp_Alyn map "Wales Flintshire".
- Ogof_Hesp_Alyn name "Ogof Hesp Alyn".
- Ogof_Hesp_Alyn registry "Cambrian Cave Registry".
- Ogof_Hesp_Alyn survey Oha.jpg.
- Ogof_Hesp_Alyn subject Category:Caves_of_Wales.
- Ogof_Hesp_Alyn type Cave109238926.
- Ogof_Hesp_Alyn type CavesOfWales.
- Ogof_Hesp_Alyn type GeologicalFormation109287968.
- Ogof_Hesp_Alyn type Object100002684.
- Ogof_Hesp_Alyn type PhysicalEntity100001930.
- Ogof_Hesp_Alyn type YagoGeoEntity.
- Ogof_Hesp_Alyn type YagoPermanentlyLocatedEntity.
- Ogof_Hesp_Alyn type Cave.
- Ogof_Hesp_Alyn type NaturalPlace.
- Ogof_Hesp_Alyn type Place.
- Ogof_Hesp_Alyn type Wikidata:Q532.
- Ogof_Hesp_Alyn type Place.
- Ogof_Hesp_Alyn type Cave.
- Ogof_Hesp_Alyn type Location.
- Ogof_Hesp_Alyn comment "Ogof Hesp Alyn (Welsh for: Dry Alyn Cave) was discovered by North Wales Caving Club in 1973 in the Alyn Gorge near Cilcain, Flintshire, Wales. Reaching the end of the cave is a serious commitment involving 24 pitches, most requiring specialist single rope technique equipment, and the draining of two sumps. A perpetual siphon is in place at the first sump which does a good job of keeping the water level relatively low, when working properly.".
- Ogof_Hesp_Alyn label "Ogof Hesp Alyn".
- Ogof_Hesp_Alyn sameAs m.08n0r4.
- Ogof_Hesp_Alyn sameAs Q7080186.
- Ogof_Hesp_Alyn sameAs Q7080186.
- Ogof_Hesp_Alyn sameAs Ogof_Hesp_Alyn.
- Ogof_Hesp_Alyn wasDerivedFrom Ogof_Hesp_Alyn?oldid=581378953.
- Ogof_Hesp_Alyn isPrimaryTopicOf Ogof_Hesp_Alyn.
- Ogof_Hesp_Alyn name "Ogof Hesp Alyn".