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Content: Secondly, turbid water may be a risk. Turbid water does not necessarily contain harmful microrganisms. The water may be turbid due to suspended solids, such as sand particles. But there are risks to turbid water, such as the disability to guess the depth of the water and the disability to see obstacles in the water. Thirdly, water currents may be a risk. When currents change during an afternoon of swimming, people in the water may be surprised and may find it hard to return to the beach. Fourthly, the transition from un-deep to deep water may occur very sudden. In deep water the risk of obtaining swimmers cramp is much higher and there are ships, surfers and sailors that may overlook swimmers. It is not wise to go swimming in harbours, in waterways, or near floodgates. Fifthly, there is a risk to swimming in polluted water.