When waves run into water moving in the opposite direction, they are slowed, just as if they were approaching a beach. Wave length becomes shorter, wave height higher, and they may break. A good (bad) example of this is an ebb current flowing out of Raccoon Strait into waves coming in from the Golden Gate. Good rough water training, if that’s what you want. 

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The WaterRower Classic Rowing Machine is an amazing and long-term investment in your health, as well as the beauty of your home décor. For the money, the durability, quality and guarantee to have a great rowing machine for a very long time. On top of that, this machine provides a level of comfort that will allow you to extend your workouts for an ultimate experience. Highly recommended.
The tank of the WaterRower Oxbridge Rower is made from polycarbonate, one of the strongest plastics available. It is virtually indestructible. The tank is sealed and can be filled with municipal water via a small opening closed by a stopper. This water typically contains enough chlorine to remain clear for some time. After exposure to light, the chlorine will degrade; the chlorine tablets should be added periodically.
The overall rowing experience encompasses pulley, seat, and — of course — resistance. Air and water have very distinct qualities, making them impossible to compare but interesting to contrast. Air stores inertia, which feeds into intense, constant effort during a goal-oriented workout. Water’s more sluggish drag makes for demanding exercise, but one that’s less consistent.
Some rowing enthusiasts claim that the disproportionate number of tall rowers is simply due to the unfair advantage that tall rowers have on the ergometer. This is due to the ergometer's inability to properly simulate the larger rowers drag on a boat due to weight. Since the ergometer is used to assess potential rowers, results on the ergometer machine play a large role in a rower's career success. Thus, many erg scores are weight-adjusted, as heavyweights typically find it easier to get better erg scores. Also, since crew selection has favored tall rowers long before the advent of the ergometer,[46][47] and bigger, taller crews are almost universally faster than smaller, shorter crews on the water, being tall is a definite advantage ultimately having little to do with the ergometer.
At the collegiate level (in the United States), the lightweight weight requirements can be different depending on competitive season. For fall regattas (typically head races), the lightweight cutoff for men is 165.0 lb. and 135.0 lb. for women. In the spring season (typically sprint races), the lightweight cutoff for men is 160.0 lb., with a boat average of 155.0 lb. for the crew; for women, the lightweight cutoff is 130.0 lb.[48]
Rowers may take part in the sport for their leisure or they may row competitively. There are different types of competition in the sport of rowing. In the U.S. all types of races are referred to as regattas whereas this term is only used in the UK for head-to-head or multi-lane races (such as those that take place at Dorney Lake), which generally take place in the summer season. Time trials occur in the UK during the winter, and are referred to as Head races. In the US, head races (usually about 5k, depending on the body of water) are rowed in the fall, while 2k sprint races are rowed in the spring and summer.