Water Polo Olympic Aquatics Stadium, Maria Lenk Aquatics Centre Aug 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Ball diameter: 22.6cm (men), 21.3cm (women) Weight 400-450g Pool: 2m deep Team Goalkeeper, six outfield players 30m (men) 25m (women) 2m area: Attacking player must have ball to enter Substitution area 20m Floating goal 3m wide, 0.9m high Goal line 5m area Penalty shot for fouls inside area Centre mark Coloured buoys mark playing area Playing time Four 8-minute periods. Team in possession has 30 seconds to score or ball passes to opposition London Olympics gold medal- winning team member Miho Boskovic (CRO) Fouls Striking ball with fist Off-the-ball tackle Holding ball with two hands (except goalkeeper) Touching sides or bottom of pool Holding ball underwater Sources: Rio 2016, Olympic.org, FINA Pictures: Associated Press