When submerged, deepwater rice shows rapid elongation of internode, leaf sheath, and leaf blade, the amount depending on variety. We studied 15 deepwater varieties for their relative elongation efficiency during the 1996 wet season at Cuttack. Three pots with two 37-d-old plants of each variety were submerged in a 110-cm deepwater tank. On the first day, water level was maintained at 40 cm, and on the following day it was raised to 110 cm. The height of plants was recorded before submergence and every 2 d during submergence, up to 10 d.