Yes, ponding is in the scrabble dictionary.

What does the word Pondmean?

An inland body of standing water, either natural or man-made, that is smaller than a lake. ... To block the flow of water so that it can escape only through evaporation or seepage; to dam.

What is a ponding flood?

Ponding is a type of flooding that can happen in relatively flat areas. Rain water falling in an area is normally stored in the ground, in canals or lakes, or is drained away, or pumped out. When more rainwater enters a water system than can be stored, or can leave the system, flooding occurs.