Only flows when there is a extreme rainfall square Flows year round square Flows most of the year, except about a week square : Perennial : Ephemeral : Intermittent

The question is asking to identify the type of stream based on its flow pattern. Streams can be categorized into three types based on their flow pattern: perennial, ephemeral, and intermittent.<br /><br />1. Perennial streams flow year-round. They are continuously flowing streams that are found in valleys and plains. They have a constant flow and are not dependent on rainfall.<br /><br />2. Ephemeral streams flow only after a significant rainfall. They are dry most of the time and only flow during and immediately after a rain event.<br /><br />3. Intermittent streams flow most of the year but may dry up for a short period, usually a week or so, during dry spells.<br /><br />Given the options, the correct answer is "Perennial" because it is the only type of stream that flows year-round.