A HydroSack or a HydroSnake is a brand name for a flood controlsandbagalternative made by Gravitas International of Cheshire, North West England. 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 ofnon-wovenpolypropylene with a hydrophilic finish. The internal pads are composed of pads containing wood pulp and a superabsorbent polymer. In this form, the HydroSack or HydroSnake weighs. The HydroSack measures and the HydroSnake measures. When a HydroSack or a HydroSnake comes into contact with water, the SAP crystallizes and absorbs the water. HydroSacks take approximately 2-3 minutes to reach full capacity. The HydroSack and the HydroSnake are very absorbent. Full capacity is between 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. The HydroSack has a three-section structure with handles. 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. Fifecouncil in the United Kingdomrecently integrated the HydroSack into their first response flood protection. 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.
