--- title: "Define RT works, objectives, purposes of spur" subject: "Irrigation and Drainage Engineering" chapter: 6 key: "semester_6/irrigation_and_drainage_engineering:river-training-objectives-spur-purposes" source: https://www.bctengineer.com/q/semester_6/irrigation_and_drainage_engineering/river-training-objectives-spur-purposes site: BCT Engineering --- # Define RT works, objectives, purposes of spur Irrigation and Drainage Engineering · Chapter 6: River Training Works - Asked in: 2068 Baisakh (old course), 2+3+2 marks - Video: [Irrigation- River training works / Objectives / Classification / Methods of River training (Hindi)](https://www.youtube.com/watch?v=RUyHrZIB1WU) — Yogendra Ram Meena - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_6/irrigation_and_drainage_engineering/river-training-objectives-spur-purposes - Whole chapter: https://www.bctengineer.com/md/semester_6/irrigation_and_drainage_engineering/chapter-6 ## Question Define river training works. Enumerate three major objectives of river training works. Write down two basic purposes of spur installation. ## Short answer River training works are structures built along a river to guide flow, control its behaviour, and protect banks and structures from erosion and floods. Three major objectives are: prevent flooding by confining the river, protect banks/structures from erosion/outflanking, and ensure axial flow to structures with silt control. Spurs serve to deflect current away from eroding banks and create slack water for silting. ## Answer #### Definition (2 marks) **River training works** are structures constructed on, along or across a river so as to guide the flow, control the river's behaviour and protect the banks and the structures from erosion, floods and shifting. #### Three major objectives (3 marks) 1. **To prevent flooding** and spilling over the banks by confining the river within a defined course. 2. **To protect banks and structures** (bridges, barrages, embankments, towns, farmland) from erosion, scour and outflanking. 3. **To ensure axial flow** to a structure and control silt, so that a stable and uniform channel is maintained for headworks, navigation or water supply. #### Two basic purposes of spurs (2 marks) 1. **Training the river**: to deflect the current away from an eroding bank and hold it near the centre of the channel. 2. **Creating slack water for silting**: to reduce velocity near the bank and promote deposition between the spurs, forming a new, stable bank (land reclamation). ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. Which describes river training works? A. Structures to store irrigation water B. Roads along rivers C. Pipes to carry flow D. Structures that guide flow, control river behaviour and protect banks and structures from erosion and floods Answer: D. They guide and control river behaviour to protect banks and structures. (Key point: Definition) 2. Which is a major objective of river training? A. Increase erosion of banks B. Ensure axial flow to a structure and control silt C. Create eddies near bridges D. Encourage the river to shift course Answer: B. Axial approach and silt control keep a stable, uniform channel for headworks or navigation. (Key point: Objective: axial flow) 3. A basic purpose of a spur is to: A. Block the river completely B. Store flood water C. Attract current to the bank D. Deflect current away from an eroding bank and hold it near the channel centre Answer: D. Training the river away from the bank is the first purpose. (Key point: Spur purpose 1) 4. The second basic purpose of a spur is to: A. Increase velocity near the bank B. Scour the bed C. Provide irrigation D. Create slack water so silt deposits between spurs, forming a new bank Answer: D. Reduced velocity near the bank promotes deposition and land reclamation. 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