[1][2] After school Arumugam joined the Ceylon University College in 1923, graduating in 1927 with a General Bachelor of Science degree.

[1][2] Arumugam was married and had three sons (Thiru, Sri and Sakthi) and four daughters (Sushila, Vimala, Praemala and Ahila).

[1] In 1948, when Arumugam was Divisional Irrigation Engineer based in Vavuniya, he built a dam at Palavi, providing a water tank for Thiruketheeswaram temple.

[2] Arumugam carried out various investigations at the Nilavarai "bottomless" well near Puttur the results of which enabled a Hercules Windmill pump to be built at Urellu Pokkunai well in 1952, providing irrigation water for the surrounding fields at minimal cost.

[1][2] Arumugam spent his retirement researching and writing books on Tamil culture and Hindu civilisation in Sri Lanka.