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Reply	Bill Dickinson says: I too have noticed that the water in my garden pond clears after heavy rain, not just after an electrical storm. I am not at all convinced by the explanation printed in New Scientist. A heavy storm will only increase the volume of my pond by a few percent at most. Certainly not enough to substantially dilute the algae and water mixture already in the pond. I had assumed that the heavy rain had oxygenated the surface of the pond causing the algae to sink, or there was a mechanical effect caused by the rain striking the pond.  (no votes) Tags: technology, unanswered, transport, planet earth, plants.
	posted on 2009-04-17 22:11:00 | Report abuse

Reply	phil D says: All good answers. I'm no expert but from what I've learned, the cleansing of the water would be due to the addition of the water.Organics consume Oxygen(O) and produce Carbon Dioxide(CO2).Plants Consume CO2 and produce O.Rainfall does 3 things.-It churns the water, mixing in O from the air.-The rain water, coming from the rainclouds in the sky, is generally rich in O-Overflow spills out both, but only the clean, O rich water keeps coming in.Unfortunately I don't know enough about Ozone and chemistry to comment on other effects.  (no votes) Tags: unanswered, human body, planet earth, plants.
	posted on 2009-04-20 17:13:00 | Report abuse

Reply	Anonymous says: I wouldn't combine the effect on the algae in a small pond and the effect on a reservoir supplying drinking water into one theory.There could be a temperature difference between the rainwater and the previous water. There could also be a difference in salinity or buoyancy for the algae. They may be submerged to a lower level somehow. Algae may actually be sensitive to ozone and submerge somehow to avoid this. Finally the raindrops hitting the algae or the surface of the water could affect the surface tension somehow. Could be a myriad of factors...get experimenting!  (no votes) Tags: unanswered, human body, planet earth, plants.
	posted on 2009-04-21 03:12:00 | Report abuse Reply Matg says: You have covered most of it. Also, acidity from CO2 and N2O, the latter partly from lightning.  (no votes) Tags: unanswered, plants, humanbody, planetearth. posted on 2009-11-15 12:05:20 | Report abuse

Reply	Bill Zimmermann says: Lightning frightens the life out of pond water.  (no votes) Tags: unanswered, human body, planet earth, plants.
	posted on 2009-04-27 14:58:00 | Report abuse

Reply	Anonymous says: has anyone considered the effects of the LOUD thunder .this could knock off any gases that cling to the surface of the algae thereby changing their buoyancyoccam's razor?however i have heard many claims that (hours) subsequent to thunderstorms the algae in swimming pools gets much worse (not from the point of view of the algae)if this is true it could be from the fact that uv light accelerates the rate of loss of dissolved chlorine  (no votes) Tags: unanswered, human body, planet earth, plants.
	posted on 2009-04-29 15:06:00 | Report abuse

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