New Delhi, Sept. 30 -- The Delhi government will carry out a detailed topographic and bathymetric survey of the Yamuna stretch from Palla on the Delhi-Haryana border to Jaitpur on the Delhi-Uttar Pradesh border to map the river's underwater terrain and identify clogged sections that may be contributing to flood risk, senior government officials said on Tuesday.

The study will also examine changes in the river's cross-sections and course. The topographic survey will map all physical features within 100 metres of either bank, including embankments, spurs, drains, islands, ghats and encroachments.

A topographic survey charts natural and man-made features and their elevations to produce a comprehensive surface map. A bathymetric survey, mea...