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The glacial feed to the lakes gives them a distinctive blue colour, created by glacial flour, the extremely finely ground rock particles from the glaciers. Lake Pukaki covers an area of 178.7 kmÂ², and the surface elevation of the lake normally ranges from 518.2 to 532 metres above sea level.he lake is now part of the Waitaki hydroelectric scheme. The lake's original outflow was at its southern end, into the Pukaki River. The outflow has been dammed, and canals carry water from Lake Pukaki and Lake Ohau through the Ohau A power station to Lake Ruataniwha.
The intrinsic color of liquid water may be demonstrated by looking at a white light source through a long pipe that is filled with purified water and closed at both ends with a transparent window. The light turquoise blue color is caused by weak absorption in the red part of the visible spectrum.he water molecule can vibrate in three different modes when light hits it. The red, orange, yellow, and green wavelengths of light are absorbed so that the remaining light we see is composed of the shorter wavelength blues and violets. This is the main reason why ocean color is blue.