Analysing terrain data
The exposure grade does not take into account objective hazards (stone fall, seracs, etc) but only the consequences of the skier falling.
Low Exposure (E1): Exposure is limited to that of the slope itself. Getting hurt is still likely if the slope is steep and/or the snow is hard.
Medium Exposure (E2): As well as the slope itself, there are some obstacles (such as rock outcrops) which could aggravate injury.
High Exposure (E3): In case of a fall, death is highly likely.
Extreme Exposure (E4): In case of a fall, the skier faces certain death.
Water Tank is a classic descent.
The Water Tank drop in can be found at the "end" (northern most point) of the Benchmark ridge.
There are some options to enter and ski Water Tank, many which require long exposure to avalanche terrain.
Although there are multiple options to ride WT, the basic line can be very straight forward by staying in the meat of the couloir.
There are some fun easy cliff bands on skier's left and good tree skiing can be found even further left.
A good map of the area is essential if you plan on navigating the trees to skier left due to the nature of larger unrideable cliffs that become more frequent as the ridge extends NNW.
As the couloir terminates, it becomes narrower and more difficult to navigate.
Keep to the main drainage and work whatever snow remains down to the bottom.
Water Tank ends at an actual water tank in the East Vail neighborhood.
It's very easy to reach the bus stop from the bottom of the drainage.