1) Dike 2) Dyke 3) Levee 4) Pond creator 5) Pond creator near a factory 1) Weir 
A mill dam (International English) or milldam (US) is a dam constructed on a waterway to create a mill pond. Water passing through a dam`s spillway is used to turn a water wheel and provide energy to the many varieties of watermill. By raising the water level so that the overflow has farther to fall, a milldam increases the potential energy that ....
• (n.) A dam or mound to obstruct a water course, and raise the water to a height sufficient to turn a mill wheel.
Mill'dam` noun A dam or mound to obstruct a water course, and raise the water to a height sufficient to turn a mill wheel. 
[n] - dam to make a millpond to provide power for a water mill
noun dam to make a millpond to provide power for a water mill