Types of mikvaot

What is the difference between a maayan, bor al gabai bor, and a side by side in regards to the type of mikvah?
Thanx a lot!

Dear questioner,

Thank you for your question.

A ma'ayan is a flowing source of water such as a natural spring. A number of conditions which apply to a mikveh do not apply to a ma'ayan.

The other two types you mention are different forms of construction of a mikveh using standing water.  Some specific groups, such as Chabad, have special requirements for mikveh construction. 

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