Civil Engineering Notebook (CEN)

MPPSC AE-2022 II 8-10-2023 II EXAM ANALYSIS II https://youtu.be/lXiqlRBBSDo

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https://youtu.be/g6oX_YbW644 SUB ENGINEER II MP POLICE HOUSING BOARD WAITING LIST CLEAR II

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FACT Canal Lining: 👉Canals are lined to reduce seepage losses, and to the chances of waterlogging in a given area. 👉Various types of lining options are available, and the selection of a particular type is related to cost effectiveness and ready availability. 👉Lined channels are non-erodible, and hence their design theories are different from those of unlined canals. Brick Lining: 👉To make the lining successful the lining may be constructed of two layers of bricks laid flat in mortar. The first layer is laid on a 12 mm layer of 1: 6 cement mortar. This 12 mm thick layer of cement mortar is spread on the properly compacted and wetted subgrade.   👉Then on the top of first brick layer, a 12 mm layer of 1: 3 cement mortar is given. It is allowed to cure for two days. 👉Finally second layer of bricks in mortar is laid on the top. Thus a 12 mm layer of rich cement mortar (1: 3) is sandwiched between two brick layers and this layer is actually responsible to make the lining practically watertight.    🔰Important Points  Types of canal lining: Canals are lined by any of the following materials: ▪️Concrete (in-situ construction). ▪️Precast concrete (tiles). ▪️Lime concrete. ▪️Shotcrete or guniting. ▪️Brick tiles. ▪️Asphalt- (a) Buried asphalt membrane (b) Asphaltic concrete. ▪️Stone blocks, concrete blocks or undressed stones. ▪️Earth materials- (a) Compacted earth (b) Soil cement. ▪️Prefabricated light-weight membranes. ▪️Bentonite - soil and clay membranes. ▪️PVC films. #irri