Chute spillway of Llyn Brianne dam in Wales A spillway is a structure used to provide the controlled release of flows from a dam or levee into a downstream area, typically the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels . Spillways ensure that the water does not overflow and damage or destroy the dam. Floodgates and fuse plugs may be designed into spillways to regulate water flow and reservoir level. Such a spillway can be used to regulate downstream flows – by releasing water in small amounts before the reservoir is full, operators can prevent sudden large releases that would happen if the dam were overtopped. Other uses of the term "spillway" include bypasses of dams or outlets of channels used during high water, and outlet channels carved through natural dams such as moraines. Water normally flows over a spillway only during flood periods – when the reservoir cannot hold the excess of water entering the reservoir ove...
A major Relative key F-sharp minor Parallel key A minor Dominant key E major Subdominant D major Component pitches A, B, C ♯ , D, E, F ♯ , G ♯ A major (or the key of A ) is a major scale based on A, with the pitches A, B, C ♯ , D, E, F ♯ , and G ♯ . Its key signature has three sharps. Its relative minor is F-sharp minor and its parallel minor is A minor. The key of A major is the only key where a Neapolitan sixth chord on 2^displaystyle hat 2 requires both a flat and a natural accidental. The A major scale is: override Score.TimeSignature #'stencil = "##f" relative c'' clef treble key a major time 7/4 a4 b cis d e fis gis a gis fis e d cis b a2 "/> In the treble, alto, and bass clefs, the G ♯ in the key signature is placed higher than C ♯ . However, in the tenor clef, it would require a ledger line and so G ♯ is placed lower than C ♯ . Contents 1 History 2 Notable compositions in A major 3 See also 4 References 5 Fur...
Ajka, Hungary
