![]() ![]() These will tend to push you off course, can interfere with breathing, and require a lot more effort if they are of any size. Waves - Even a lake swim will have wavelets and/or waves, especially if there is a wind.Most of the time it will be in the range of a few feet. Visibility - You will rarely ever have as much visibility in a lake/ocean as you do a pool. ![]() (For example, the shallow, man made lake near me in Arizona that hosts a lot of triathlons is not wet suit legal for most summer events, as it is too hot). Most commercial pools are 80+ for degrees, competitive down around 75 degrees, and lakes usually run between 65-80 depending on depth, time of year and geographic location. If you swim in a competitive temperature pool then the difference will be much less. Temperature: Most of the time the lake/ocean will be much colder than a typical pool.The variance will be on how well you swim without lane lines, how well you sight, and if you get nervous/tense in the open water (As well as weather conditions race day such as wind/waves). Since you have ~ a 15 min swim time for an 800 (Which is a decent time), I would guesstimate you will be able to do the swim in a lake environment in about 18-20 minutes. The less experienced you are, the greater the difference will be. The difference in a pool swim is mostly due to being able to push off the walls at the 25/50 mark. For the pointy end swimmers (The ones that will be first out of the water), there isn't that much of a dropoff in the actual swimming time. ![]() It's hard to compare pool times to open water because there are a lot of differences in the environment that change (such as wind, waves, current, temperature, etc). ![]()
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