What term describes a conduit specifically utilized for carrying rainwater?

The term that specifically describes a conduit utilized for carrying rainwater is the storm sewer. Storm sewers are designed to manage and transport excess rainwater and surface runoff away from impervious surfaces such as roads and buildings, directing it toward treatment facilities or natural water bodies to prevent flooding and erosion.

Storm sewers differ from general drainage pipes, which may be used for various types of water, including sanitary sewer systems or groundwater, and are not exclusively intended for rainwater. A watercourse refers more broadly to any natural or artificial passage for water, such as rivers and streams, and does not specifically denote a constructed system for stormwater management. Similarly, channels are open ditches or constructed forms for directing water flow but do not inherently imply the management of rainwater in urban settings as storm sewers do. Thus, storm sewer is the most precise term for a system primarily designed to carry away rainwater and manage stormwater runoff.