Each department must select the size of the tank based on which factors?

The selection of tank size is primarily influenced by local water requirements and road conditions. Local water requirements encompass the volume of water needed for various potential emergency situations, such as fires, natural disasters, or community events, informing the minimum capacity the tank should have to effectively support operations.

Road conditions are crucial as they determine the accessibility and transportability of the mobile water supply unit. This includes understanding any limitations posed by the infrastructure, such as the ability to navigate narrow roads or areas with steep grades. If the road conditions are not favorable, it may be necessary to adjust the size of the tank or select a different vehicle capable of meeting the demands while ensuring safe travel.

Focusing solely on local water requirements or other factors without considering these two key aspects could lead to inadequate resource availability or logistical challenges that hinder effective response efforts.