---
title: "Short note: Operation and maintenance"
subject: "Irrigation and Drainage Engineering"
chapter: 1
key: "semester_6/irrigation_and_drainage_engineering:operation-maintenance-irrigation-system"
source: https://www.bctengineer.com/q/semester_6/irrigation_and_drainage_engineering/operation-maintenance-irrigation-system
site: BCT Engineering
---

# Short note: Operation and maintenance

Irrigation and Drainage Engineering · Chapter 1: Introduction

- Asked in: 2066 Bhadra (old course), 4 marks; 2065 Shrawan (old course), 4 marks; 2065 Kartik (old course), 4 marks; 2070 Chaitra (old course), 4 marks; 2063 Asoj (old course), 4 marks; 2062 Baisakh (old course), 4 marks; 2062 Kartik (old course), 4 marks (asked 7 times)
- 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/operation-maintenance-irrigation-system
- Whole chapter: https://www.bctengineer.com/md/semester_6/irrigation_and_drainage_engineering/chapter-1

## Question

Write a short note on operation and maintenance of irrigation systems (types of maintenance).

## Short answer

Operation delivers water timely through gate control and scheduling. Maintenance includes routine (annual desilting, repairs), periodic (lining repair), emergency (breach fixes), preventive (planned inspections), and rehabilitation for major reconstruction. Good O&M ensures efficiency and equity.

## Answer

**Operation and maintenance (O&M)** means running the system to deliver water at the right time, place and quantity, and keeping the physical structures in good working condition. Poor O&M is the main reason many projects fail to give planned benefits.

#### Operation
Gate operation at headworks and regulators, flow control, water distribution by schedule (rotation, warabandi or demand), recording of discharge, and coordination with farmers.

#### Types of maintenance
1. **Routine (annual) maintenance:** done every year, usually in the closure period: desilting canals, removing weeds and vegetation, repairing banks, greasing and painting gates, cleaning drains.
2. **Periodic maintenance:** done after a few years: repair of lining, structures, bed levelling, replacement of gates and worn parts, re-sectioning of canals.
3. **Emergency maintenance:** immediate repair of breaches, damage by flood or landslide, blocked structures during the irrigation season.
4. **Preventive maintenance:** planned inspection and repair before failure occurs.
5. **Rehabilitation/special repair:** major reconstruction when the system has deteriorated.

#### Requirements
- Annual O&M plan and budget; trained staff and tools.
- Water user association participation and collection of irrigation service fee.
- Records of discharge, silt and damage; canal closure period for work.

Good O&M raises efficiency, extends life and gives equitable water distribution.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. What does operation and maintenance of an irrigation system aim to do?
   A. Deliver water at the right time, place and quantity and keep structures in good condition
   B. Only build new canals
   C. Only collect irrigation fees
   D. Only record rainfall
   Answer: A. O&M covers both running the system and keeping the physical structures working. (Key point: Meaning of O&M)

2. Which work is routine (annual) maintenance?
   A. Breach repair during a flood
   B. Desilting canals, weed removal and bank repair in the closure period
   C. Complete reconstruction of an aged system
   D. Replacement of gates after many years
   Answer: B. Routine maintenance is yearly work done in the canal closure period. (Key point: Routine maintenance)

3. A canal bank breaches during the irrigation season. Which maintenance type applies?
   A. Routine maintenance
   B. Periodic maintenance
   C. Emergency maintenance
   D. Rehabilitation
   Answer: C. Emergency maintenance is immediate repair of breaches or flood and landslide damage. (Key point: Emergency maintenance)

4. How does periodic maintenance differ from preventive maintenance?
   A. Periodic is done daily; preventive after failure
   B. They are identical
   C. Periodic is done only after floods; preventive only by farmers
   D. Periodic is repair after a few years (relining, gate replacement); preventive is planned inspection and repair before failure
   Answer: D. Periodic work is done every few years, while preventive maintenance anticipates failures. (Key point: Periodic vs preventive)

## Related in Irrigation and Drainage Engineering

- [Planning levels and types of maintenance](https://www.bctengineer.com/question.md?key=semester_6%2Firrigation_and_drainage_engineering%3Aplanning-levels-and-maintenance) — Irrigation and Drainage Engineering, chapter 1, asked 2×

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