From wiki
'Wiki
'Use of water cannon in riot control contexts can lead to injury or death,[2] with fatalities recorded in Indonesia (in 1996, when the cannon's payload contained ammonia),[3] Zimbabwe (in 2007, when the use of cannons on a peaceful crowd caused panic),[4] Turkey (in 2013, when the payload was laced with "liquid teargas"),[5] Ukraine (in 2014, with the death of activist and businessman Bogdan Kalynyak, reportedly catching pneumonia after being sprayed by a water cannon in freezing temperatures)[6] and South Korea (in 2016, when a 68 year old farmer died after injuries sustained by a water cannon the previous year).[7] Water cannons in use during the 1960s, which were generally adapted fire trucks, would knock protesters down and on occasion, tear their clothes.
On 30 September 2010, during a protest demonstration against the Stuttgart 21 project in Germany, a demonstrator was hit in the face by a water cannon.[8] Dietrich Wagner, a retired engineer, suffered damage to his eyelids and retinas[9], resulting in near-complete loss of his eyesight.[8][10] Graphic imagery was recorded of the event, sparking a national debate about police brutality and proportionality in the use of state force.
According to a report issued in the United Kingdom[citation needed], using plastic bullets instead of water cannons was justified because the latter "are inflexible and indiscriminate", although several people had previously been killed[11] or seriously injured by plastic bullets.[citation needed]''
A bit wet...
People really don't know what they're talking about do they. Do some research before saying yeah yeah get water cannons. Our government has decided not to use them for a reason. If you want that changed, write to your MP.