There have been several ecological concerns raised regarding the water project in Bhubaneswar, primarily related to the clearing of trees for construction purposes. Here are some of the key points:

• Large numbers of trees, including mangroves, have been cut down to make way for the project, which is expected to provide water to nearly 2 million people.
• Environmental groups have raised concerns that this deforestation will lead to soil erosion, loss of habitat for wildlife, and reduced biodiversity in the area.
• There are worries that the loss of trees will exacerbate the effects of climate change by reducing the ability of the land to absorb carbon dioxide and other greenhouse gases.
• There are also concerns that the construction activities will pollute the local water sources and harm aquatic life in the region.
• Furthermore, the project has been criticized for failing to involve local communities in decision-making processes and for ignoring the potential social and cultural impacts of the deforestation.

Overall, the ecological concerns related to the water project in Bhubaneswar underline the need for thoughtful planning and sustainable development practices to ensure that human needs are met without harming the environment.