[1] Precipitation runoff from Deluge Mountain's southwest slope drains to the Duncan River, and from all other slopes into Crystalline Creek and eventually the Spillimacheen River.

Topographic relief is significant as the summit rises 1,200 metres (3,900 feet) above the Crystalline valley in 2 kilometres (1.2 miles).

[1] Sometimes the peak can be seen from Crystalline valley during a rain storm, with its summit shrouded in clouds and a waterfall pouring from its north slope.

The mountain's toponym was officially adopted June 9, 1960, by the Geographical Names Board of Canada.

[3] Based on the Köppen climate classification, Deluge Mountain is located in a subarctic climate zone with cold, snowy winters, and mild summers.