The isolation curb shall consist of an upper support rail with supply and return duct supports on which the equipment and duct openings rest and a lower support curb which is attached to the roof structure, separated by free-standing, unhoused, laterally stable steel springs.
Happy Saturday! River City is a military term for a command's communications being down. Meaning Skype, email, internet access and phone calls. This can happen for many different reasons. Usually its because something is happening that the command does not want anyone outside of the command to know about.
River forecast data and tide levels are used to estimate the depth at various gauge points along the river. When planning river transit, ship squat must be taken into consideration. This planning tool is not recommended for actual river navigation and is only intended to give an estimate of future channel conditions. The Columbia River Navigation Channel is maintained by the US Army Corps of Engineers to 43 feet. Current available channel depth will vary from the authorized level and local conditions must be taken into consideration for any actual river transit.