Kala Wewa and Yodha Ela (Jaya Ganga)

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Kala Wewa and its waterway, Yodha Ela (Jaya Ganga) is one of the most magnificent achievements of the ancient irrigation engineers of Sri Lanka. This reservoir was built by King Dhatusena (459-477 CE) as part of rebuilding the country after liberating it from South Indian invaders who had plundered the country for over 25 years.

This reservoir has a circumference of over 40 miles (65 km) and has a total area of 7 square miles (18.1 square kilometers) at full capacity. The ancient spill (pitawana) is measured to be 216 feet (66 meters) in width and 170 feet (52 meters) in length. For comparison, the width of the spill is more than three-quarters of the length of a soccer field! The spill was built using hammered Granite, a solid structure one could imagine. Each block of Granite is shaped precisely to fit its neighbor. The whole structure eventually acts like one huge rock.

Balalu Wewa

Kala Wewa Reservoir encompassed the nearby Balalu Wewa Reservoir, which had been built by King Kutakanna Tissa (42-20 BCE) at a much earlier period (Denis & Fernando, 1980). Once the Kala Wewa was completed, it was one of the largest reservoirs in history. Therefore, sometimes this massive irrigation reservoir is called Kala Balalu Wewa. The total length of the dam is 22,572 feet (6.88 kilometers), and the height is 40-60 feet (12-18.3 meters).

The left bank channel is called the Balaluwewa Ela and leads to the Siyambalagamuwa Wewa Reservoir, which was built by King Mahasen (276-303 CE). Further down the Kala Oya, the right bank channel called the Yaka Bendi Ela leads to the Paikan Kulam Reservoir. Further down the Kala Oya is the Pallan Kadawal Anicut (Denis & Fernando, 1980).

The Ingenious Irrigation Feat of Yodha Ela

Yodha Ela, also known as the Jayaganga, is a remarkable 87-kilometer-long canal that carries water from the Kala Wewa reservoir to the ancient city of Anuradhapura. It feeds all three major reservoirs in Anuradhapura—Abhaya Wewa, Tissa Wewa, and Nuwara Wewa—as well as the Nachchaduwa Wewa.

What makes this canal truly extraordinary is its gradient: a mere 6 inches per mile (1:10,000). Even with today’s laser-guided instruments, maintaining such precision over long distances remains a significant engineering challenge. Just a few miles after departing Kala Wewa, Yodha Ela splits into two branches—one flowing toward Nachchaduwa and the other toward the reservoirs in Anuradhapura.

King Dhatusena‘s vision for the Kala Wewa–Jayaganga system was ambitious. It was designed to distribute water to over sixty village reservoirs in addition to Anuradhapura itself. To this day, irrigation engineers marvel at how such an extensive and accurately graded waterway—40 feet wide and nearly 90 kilometers long—could have been constructed 1,500 years ago without modern tools.

Centuries later, King Parakramabahu the Great revitalized and expanded the canal. He added numerous feeder channels from thirty-four surrounding reservoirs located between Kala Wewa and Tissa Wewa. It was during his reign that the canal was renamed Jaya Ganga, meaning “River of Victory.”

Kala Wewa Under British Rule

When the British discovered this reservoir they could not comprehend the need for a such a massive spill who didn’t understand the dynamics of monsoon rain in the region.

In his 1837 book “The Maháwanso in Roman Characters: With the Translation Subjoined – and an introductory essay .., Volume 1”, George Turnour writes

“This tank situated 20 miles north west of the temple of Dambulla on the road to Anuradhapura, and which has hitherto attracted little notice, exhibits perhaps the remains of one of the greatest of the ancient great works of Ceylon. The circumference of the area of the tank, when the embankment was perfect, could not be less than 40 miles. The embankment, with the lateral mound of the Balalu Wewa, is at least 10-12 miles long. The stone spill water in the broken bank of Kala Wewa is perhaps one of the most stupendous monuments in the island, of misapplied human labour. The canal by which the waters of this tank were conducted to Anuradhapura may still be partially traced : and in this vicinity, the remains of the ancient fortress of the Wijitha are to be found. “

Kadawara: The Legendary Guardian of Kala Wewa

There is a popular legend surrounding how the king discovered the ideal location to build the Kala Wewa reservoir. According to folklore, a man named Kadawara had left his home and retreated into the forest after suffering mistreatment from his wife. Over the years, he became one with the wilderness, even living peacefully among a herd of deer.

One day, a Vedda hunter, tasked with supplying venison to the royal palace, spotted this unusual man dwelling among the animals. Suspecting that Kadawara might be guarding a hidden treasure, the hunter reported the sighting to the king. Intrigued by the possibility of treasure, the king dispatched his soldiers, who captured Kadawara and brought him to the palace.

When questioned by the king, Kadawara explained that the only “treasure” he knew of was a vast body of water trapped in a sunken plain. The water, he said, was blocked from flowing freely by thick clusters of Kala creepers.

The king visited the location and saw its potential as a reservoir site. Impressed, he ordered the construction of the tank and appointed Kadawara as its caretaker.

One rainy day, Kadawara noticed a small leak in the bund. As he waited for workers to arrive, the leak worsened. In a desperate attempt to prevent a catastrophic breach, he reportedly plugged the hole with his own head. He died in the process, but his sacrifice saved the dam. Legend says he was reborn as a deity, still watching over the tank. (Brohier, 1965/2000, pp. 72–75)

Even today, a shrine (Devale) dedicated to Kadawara Deviyo stands near Kala Wewa, where he is revered as the guardian spirit of the reservoir and protector of the surrounding region.

The Legend of Ilandari Deviyo

As Brohier (1965/2000, pp. 72–75) writes, there are other legends surrounding the guardianship of these two reservoirs, and one of the most mystical is the tale of Ilandari Deviyo. Long before the birth of many gods, the goddess Pattini, preparing to bathe, placed a Sapu flower upon her robe. When she emerged from the water, she was astonished to find a golden-skinned boy dancing atop the flower. Enchanted, she named him Ilandari Deviyo and gifted him her menik-halamba (gem-studded anklet).

As he grew, Ilandari Deviyo became a formidable deity. He commanded wild white cattle, setting leopards upon them for sport; ruled over buffaloes, binding them with a noose in one hand and wielding a club in the other; and overpowered elephants using a heavy stone mace. He is said to fiercely guard the sacred waters of Kala Wewa and Balalu Wewa, keeping a celestial register. With a golden stylus, he inscribes retribution against those who fail to honour his dominion.

A Haven for Elephants and Wildlife

In addition to irrigating acres of paddy fields, the Kala Wewa based ecosystem supports a large variety of wildlife, and elephants become a frequent sight during the dry season.

Heritage Surrounding Kala Wewa

Close to these reservoirs also lies Vijithapura Raja Maha Viharaya and the gigantic Awukana Buddha Statue, which is another work of King Dhatusena.

According to legend, King Dutugemunu built a temple at the site of a victory post, used to announce his triumph over King Elara. This temple is believed to be the Vijithapura Rajamaha Viharaya. Although concrete historical evidence is limited, the temple grounds are scattered with ancient ruins, which are thought to date back to the Anuradhapura era.

Herd of elephants reaching Kalawewa lake - Kalawewa

Drought had dried out water from Balalu wewa. There are few waterholes scattered around apart from the main water body. Trees that were once drowned in the lake have now reappeared and the lake bed is full of vegetation.

Wildlife in the jungles surrounding Kala Wewa

References

Brohier, R. L. (2000). Seeing Ceylon in vistas of scenery, history, legend and folklore. Sooriya Publishers. (Original work published 1965)
Denis, A. and Fernando, N. (1980) ‘Major Ancient Irrigation Works of Sri Lanka’, The Journal of the Sri Lanka Branch of the Royal Asiatic Society, (new series) 22, pp. 1–22.

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Map of the Kala Wewa and Jayaganga

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Route from Colombo to Kala Wewa

Through : Kurunegala – Galewla
Distance : 173 km
Travel time :5 hours
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2 thoughts on “Kala Wewa and Yodha Ela (Jaya Ganga) – An irrigation wonder of Ancient Sinhalese (කලා වැව හා ජය ගඟ)”

hamseen says:
June 8, 2023 at 2:49 pm
“Once the Kala Wewa was completed, he built an another tank called Balalu wewa”- is that true, according to my knowledge both constructed in different era by separate king
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1. amazinglanka says:
  June 9, 2023 at 1:07 pm
  Thank you for pointing this out. Information seems to from Wikipidia. But this information is wrong. I will correct this – Regards
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