Question: How long are competition pools for FINA events?
About the article "Human swimming", section "Sport".

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Most swimming sport events are held in special competition swimming pools, which are either long course pools (50 meters) such as those used in the Olympic Games or short course pools (usually 25 yards in the United States or 25 meters in other countries) such as those used in the FINA World Swimming Championships.
Competition pools have starting blocks from which the competitor can dive in, and possibly also touch-sensitive pads to electronically record the swimming time of each competitor. 
Construction period: May 2010 - December 2012The capacity of the venue is 45,000 seats (12,000 during the World Championships 2015).
On the football pitch of the stadium two temporary 50 meters long pools are going to be constructed.
Main pool for swimming competition, and a temporary training pool connected with the competition pool with additional athletes relax and massage area.
The total capacity of the competition arena (including temporary stands) will reach 12,000 people.
Both temporary pools and a roof in the Main Swimming Arena will be constructed to meet FINA World Championships.
General Requirements in cooperation with FINA partner — Myrtha Pools. 
 "See: #Dimensions (above) and Swimming (sport)#Competition pools" Competition pools.
The Fédération Internationale de la Natation (FINA, International Swimming Federation) sets standards for competition pools: long and at least deep.
Competition pools are generally indoors and heated to enable their use all year round, and to more easily comply with the regulations regarding temperature, lighting, and automatic officiating equipment.
An Olympic-size swimming pool (first used at the 1924 Olympics) is a pool that meets FINA's additional standards for the Olympic Games and for world championship events.
It must be in length by wide, divided into eight lanes of each plus two areas of at each side of the pool.
The water must be kept at and the lighting level at greater than 1500 lux.
Depth must be at least , and there are also regulations for color of lane rope, positioning of backstroke flags (5 meters from each wall), and so on.
Pools claimed to be "Olympic pools" do not always meet these regulations, as FINA cannot police use of the term.
Touchpads are mounted on both walls for long course meets and each end for short course.
A pool may be referred to as fast or slow, depending on its physical layout.
Some design considerations allow the reduction of swimming resistance making the pool faster: namely, proper pool depth, elimination of currents, increased lane width, energy absorbing racing lane lines and gutters, and the use of other innovative hydraulic, acoustic and illumination designs. 
Swimming as a sport predominantly involves competition among participants to be the fastest over a given distance under self propulsion.
Different distances are swum in different levels of competition.
For example, swimming has been part of Olympic Swimming since 1896, and the current program contains events from 50m to 1500m in length, across all four main strokes and medley.
The sport is governed internationally by the Fédération Internationale de Natation (FINA), and competition pools for FINA events are 25 or 50 metres in length.
In the United States of America, USA Swimming is the governing body and a pool 25 yards in length is commonly used for competition.
There are other swimming and water related sporting disciplines including diving, synchronised swimming and water polo, as well as sports which include a swimming element, such as triathlon and modern pentathlon.
An Olympic-size swimming pool is the type of swimming pool used in the Olympic Games, where the race course is 50 metres in length.
This is typically referred to as "long course", distinguishing it from "short course" which applies to competitions in pools that are 25 metres in length (typically, width of 50 metre pool).
If touch panels are used in competition, then the distance between touch panels should be either 25 or 50 metres to qualify for FINA recognition.
This means that Olympic pools are generally oversized, to accommodate touch panels used in competition.