Topographical surveys are conducted to map the natural and man-made features of a land area, including mountains, water bodies, and vegetation. These surveys are essential for planning large-scale projects and understanding terrain conditions.


The bacteria mainly responsible for crown corrosion in a sewer is ___________.
In the context of construction materials, which of the following statements is/are CORRECT?
Pick one or more CORRECT statement(s) from the choices given below, in the context of upstream and downstream cut-offs provided below the concrete apron of weirs/barrages constructed across alluvial rivers.