Ais a count of the population in particular areas

Census.

Explanation:

A census is a process of data collection and is the systematic acquisition of data about the given population and united state describe the essential feathers of the population density and the sex ration and is also based on the sampling methods of data collection. Done so that the population can be mapped and studied according to the changing nature of the population as to study their distribution and other associated characteristics.

Answerhave flowing water either episodically or during only a portion of the year;

The time of day would be around 3: 00