{{Short description|Commercial flood control sandbag}}
thumb|HydroSacks being placed along a river bank, 2011. A '''HydroSack''' or a '''HydroSnake''' is a brand name for a flood control sandbag alternative made by Gravitas International of Cheshire, North West England.<ref name="SalesFlyer">{{cite web |url= http://gravitasint.com/wp-content/uploads/2012/04/hydrosack.pdf |title= HydroSack Sales flyer |website= Gravitas International |accessdate= 2014-07-04 }}{{Dead link|date=January 2020 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> They are very lightweight and thin until they come into contact with water, then they begin to retain water until they have reached capacity. The devices then resist any further water excess. These can be used to absorb, resist and redirect flowing water.
==Design and use== The HydroSack and the HydroSnake are made up of an outer fabric consisting of non-woven polypropylene with a hydrophilic finish. The internal pads are composed of pads containing wood pulp and a superabsorbent polymer (SAP). In this form, the HydroSack or HydroSnake weighs {{convert|0.5|kg|lb}}. The HydroSack measures {{convert|60|by|48|cm|in}} and the HydroSnake measures {{convert|20|by|120|cm|in}}. When a HydroSack or a HydroSnake comes into contact with water, the SAP crystallizes and absorbs the water.<ref name="Criticism">{{cite news|url=http://www.dunfermlinepress.com/news/roundup/articles/2013/06/12/460565-rosyth-residents-fears-over-useless-flood-measures |title=Rosyth residents' fears over 'useless' flood measures |newspaper=Dunfermline Press |location=Dunfermline |date=2013-06-12 |accessdate=2014-07-04 |url-status=dead |archiveurl=https://web.archive.org/web/20140714232701/http://www.dunfermlinepress.com/news/roundup/articles/2013/06/12/460565-rosyth-residents-fears-over-useless-flood-measures |archivedate=2014-07-14 }}</ref> HydroSacks take approximately 2-3 minutes to reach full capacity. The HydroSack and the HydroSnake are very absorbent.<ref name="SalesFlyer"/> Full capacity is between {{convert|15|-|20|L|gal}} of water. It retains this weight for up to six months. HydroSacks can be stacked together to form a strong ballast. It is used as a form of flood control and can be used to minimize the damage that flooding can cause.<ref name="SarahHagan">{{cite web |first= Sarah |last= Hagan |title= Gravitas International enters flood protection market with JTA flood (press release) |url= http://www.floodshoponline.co.uk/2012/06/gravitas-international-enters-flood-protection-market-with-jta-flood/ |date= 2012-06-07 |accessdate= 2014-07-04 }}</ref> The HydroSack has a three-section structure with handles.<ref name="SalesFlyer"/> When a HydroSack is no longer needed, the insides can be emptied into the earth after use, without any harmful effects.
HydroSacks and HydroSnakes are new innovations to replace sandbags for their multiple purposes, from road ballast signs to flood protection. Globally, other companies are making products similar to the HydroSack, such as UK-based FloodSax which have sold more than 2.5 million of their alternative sandbags worldwide and Thailand based Nanotec.<ref>{{cite web |first= Katia |last= Moskvitch |url= https://www.bbc.co.uk/news/technology-20502736 |title= Are floating homes a solution to UK floods? |website= BBC News |date= 2012-11-28 |accessdate= 2014-07-04 }}</ref> Fife council in the United Kingdom recently integrated the HydroSack into their first response flood protection.<ref>{{cite web |url= http://www.ice.org.uk/topics/water/Case-Studies/Fife-council |title= Fife Council |website= Institution of Civil Engineers |accessdate= 2014-07-04 |archive-date= 2014-07-09 |archive-url= https://web.archive.org/web/20140709144631/http://www.ice.org.uk/topics/water/Case-Studies/Fife-council |url-status= dead }}</ref> In June 2013, some residents of Rosyth criticized the distribution of HydroSacks for flood control, complaining that they were a single-use, disposable product. The Fife Council confirmed this, but added they would last for two or three months once filled with water.<ref name="Criticism"/>
==See also== *AquaFence *Flood control *Sandbag
== References == {{Reflist}}
== External links == *{{Official|http://www.gravitasint.com}} *[http://www.safetyshop.com/media/cms/files/ssuk/DMEU_TDS_2962_std.lang.all.pdf MSDS for HydroSack]
Category:Bags Category:Flood control