Draw the required images (e.g. dam, water, etc) in PowerPoint.
Have the water fill up the dam.
Next, click Slide Show > Custom Animation.
Select the water, click Add effect > Entrance > Wipe (bottom to top). This
will animate the water to move in upward motion.
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Shawn Toh (tohlz)
Microsoft MVP PowerPoint
(Amazing PowerPoint animations, artworks, games here) http://pptheaven.mvps.org
PowerPoint Heaven - The Power to Animate