Rivers and water resources play a vital role in the geography and development of Sri Lanka. As a tropical island, Sri Lanka depends heavily on its rivers for agriculture, drinking water, hydroelectric power, and daily human activities.
Most rivers in Sri Lanka originate in the Central Highlands and flow outward toward the sea in different directions. These rivers are mainly rain-fed and are closely connected to the island’s monsoon climate. Although Sri Lanka has many rivers, most of them are relatively short.
The Mahaweli River is the longest river in Sri Lanka and is extremely important for irrigation and power generation. Major development projects such as the Mahaweli Development Scheme were built to manage water resources efficiently and support farming in dry zones.
Sri Lanka also has thousands of man-made reservoirs, locally known as tanks or wewas. These tanks were built from ancient times to store rainwater and supply water during dry seasons. This ancient irrigation system is one of the greatest achievements of Sri Lankan civilization.
Rivers, reservoirs, canals, and wetlands together form Sri Lanka’s water resources. Proper management of these resources is essential for agriculture, flood control, biodiversity conservation, and sustainable development.
Rivers & Water Resources of Sri Lanka – Quiz
Choose the correct answer for each question.
1. Where do most rivers in Sri Lanka originate?
A. Northern Plains
B. Coastal Belt
C. Central Highlands
D. Eastern Coast
Answer: C
2. What is the longest river in Sri Lanka?
A. Kelani River
B. Kalu River
C. Mahaweli River
D. Walawe River
Answer: C
3. Which river is most important for irrigation projects?
A. Nilwala River
B. Mahaweli River
C. Gin River
D. Attanagalu River
Answer: B
4. What is a traditional reservoir in Sri Lanka called?
A. Dam
B. Lake
C. Tank (Wewa)
D. Canal
Answer: C
5. Why were ancient tanks built?
A. For fishing only
B. To store rainwater
C. For decoration
D. For sea transport
Answer: B
6. Which climate factor mainly feeds Sri Lankan rivers?
A. Snowfall
B. Monsoon rainfall
C. Glaciers
D. Underground springs
Answer: B
7. Which river flows through Colombo?
A. Kalu River
B. Kelani River
C. Mahaweli River
D. Deduru Oya
Answer: B
8. Which river is important to the Southern Province?
A. Mahaweli River
B. Walawe River
C. Nilwala River
D. Kelani River
Answer: C
9. What type of rivers does Sri Lanka mostly have?
A. Long rivers
B. Seasonal rivers
C. Short rivers
D. Frozen rivers
Answer: C
10. Which project manages water in the dry zone?
A. Gal Oya Scheme
B. Mahaweli Development Scheme
C. Uda Walawe Project
D. Kala Wewa
Answer: B
11. Which river is associated with ancient Anuradhapura?
A. Malwathu Oya
B. Kalu River
C. Kelani River
D. Gin River
Answer: A
12. Which water resource is used for hydroelectric power?
A. Rivers and reservoirs
B. Oceans
C. Lagoons
D. Wells
Answer: A
13. Which supports paddy cultivation?
A. River basins
B. Mountain peaks
C. Coastal dunes
D. Forest zones
Answer: A
14. What happens if water resources are poorly managed?
A. More rainfall
B. Floods and droughts
C. Better harvests
D. More rivers
Answer: B
15. Which river flows to the eastern coast?
A. Kelani River
B. Mahaweli River
C. Kalu River
D. Gin River
Answer: B
16. What is the main use of reservoirs?
A. Transport
B. Water storage
C. Salt making
D. Fishing only
Answer: B
17. Which water body is least found in Sri Lanka?
A. Rivers
B. Tanks
C. Glaciers
D. Canals
Answer: C
18. Which king developed major irrigation systems?
A. King Dutugemunu
B. King Parakramabahu I
C. King Vijayabahu
D. King Devanampiya Tissa
Answer: B
19. Which statement about Sri Lankan rivers is true?
A. They originate in highlands
B. They flow from coast inward
C. They are frozen
D. They flow only north
Answer: A
20. Why are water resources important?
A. They support agriculture and power
B. They create deserts
C. They reduce rainfall
D. They block trade
Answer: A