the maintenance of structures together with water testing and supervision costs. Green Bridges with shoreline and stream ecosystem treatment and the combination of plant and bacterial eco-remediation systems have been put in place.

The main source of water for the Lake Udai Sagar is a tributary of the river Berach popularly called Ahar, which passes through the city of Udaipur and joins Udai Sagar near Sukha Naka. Ahar River. This has been carrying the entire domestic and industrial wastewater of Udaipur. The wastewater enters into Udai Sagar and has been causing severe ecological problems and has turned Udai Sagar into the most polluted Lake in the region. Human intervention such as deforestation in the catchment area, and wastewater inflow have caused eutrophication, seriously affecting the ecological, biological, socio-economic and human health fabric of Udaipur. Udai Sagar is significantly suffering from eutrophication, which is evident from foul odour, mats of algae and macrophytes as well as algal blooms, presence of feacal coliforms, low concentration, fish mortality and the occurrence of streptococci.

Results of the project have already had a strong impact on revival of the Ahar River. These are illustrated below
- After 6 Green Bridges were commissioned the foul smell at the site has completely disappeared.
- The BOD and COD, which are critical indicators, have gone down by more than 70% in just one month.
- The formation of foam, which used to collect at Sukha Naka Bridge (after the 6 Bridges) in huge quantities has virtually vanished.
- The water colour is gradually changing from Black to Green to brown.
- The small roadside tea shop has been converted into the now busy “Green Bridge Restaurant” popular with local residents.
- The quality of the ground water has improved phenomenally making it possible for villagers and animals to use the water from nearby wells and tube wells for both drinking and bathing.
- Oxygen content of the water has increased many folds.
- After algae developed, Phytoplankton (microscopic plants) appeared and now Zooplanktons have emerged in profusion.
- Hardy fish such as 'Sanwal' 'Bam' and 'Chandi Chal' can now be seen living on algae & zooplanktons. Villagers are regularly fishing at the project site.
- Fish and tortoise can also be seen now in the river.
- As fish stocks have increased, water snakes have reached the treated water, feeding on the fish.
- The river water is now full of water insects, worms and fish attracting predatory birds. These can be seen feeding on fish, worms and insects on the water front. Even the supreme predator ' The human' (top of the food chain pyramid) are fishing in the area.
- The good bacteria introduced into the green bridges are active downstream as well as 300 metres upstream
- Plants now established as part of the project are flourishing.

The process of rejuvenating this Dead River has shown how a public and private partnership can be successful and has inspired other projects. The Urban Improvement Trust and the Municipal Council have now allocated 4 crores and 1 crore respectively to replace and repair polluted drains and contaminated stretches of Ahar River.

Green Bridges and Black Winged Stilt Birds
at Ahar river project site





Control Sieve - Front




Ecofert on Bridge No. 4

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