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Site investigation is carried out before the start of a new construction projects. Environmental considerations in site investigation is of much importance to investigate the site suitability for the given project. This investigation refers to the local conditions and resources both natural and those already existing including the infrastructure. A preliminary site reconnaissance should be carried out as early as possible utilizing available data, in order to consider the surroundings in relation to the project. Aerial photographs can be a valuable aid. The principal investigation that should be carried out are given below: (1) Topography - Suitability of surface features at the site on land or over water.![topography-survey topography-survey](https://test.theconstructor.org/wp-content/uploads/2012/05/fb751632d044_8E7D/topography-survey.jpg)