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How can I model daylight effect of a light well under landscape pond?

I have a project,whose light well is under the landscape pond.The depth of the water in landscape pond is approximate 40 cm. I have tried to use glass instead of water in ecotect,and set a transmittance for glass.But how can I get the transmittance data about water? Where is there some related research data about water transmittance ?

How can I model daylight effect of a light well under landscape pond?

I have a project,whose light well is under the landscape pond.The depth of the water in landscape pond is approximate 40 cm. I have tried to use glass instead of water in ecotect,and set a transmittance for glass.But how can I get the transmittance data about water? Where is there some any related research data about water transmittance ?