2023-06-01-莱坊-Bengaluru_Urban_Flood_Report_2023_11页_2mb

Bengaluru, India's third-largest city with a population of 13 million, faces escalating urban flooding issues due to rapid, unplanned growth, deteriorating stormwater infrastructure, and climate change impacts. Key drivers include economic development and real estate expansion, which have disrupted natural drainage systems and reduced stormwater drain length significantly. A masterplan for stormwater infrastructure remodel is urgently needed, involving construction and rehabilitation of drains, estimated at Rs 2800 Cr, plus sustainable financing through mechanisms like Value Capture Financing and nature-based solutions such as Sponge City models. Bengaluru's continued growth necessitates integrated, eco-conscious development to avoid recurrent flooding and ensure long-term resilience.

1. Problem: Urban flooding is severe, caused by unplanned urbanization that has increased built-up area to 93.3% by 2020, severely stressing stormwater drains and reducing natural waterbody connections.
2. Causes: Population growth, high-intensity rainfall (e.g., 131.6 mm in September 2022), and aging infrastructure exacerbate flooding risks.
3. Economic Context: Bengaluru contributes 36% to Karnataka's GDP, with IT/ITES sector creating millions of jobs; real estate development drives growth but must prioritize sustainable infrastructure.
4. Solution Need: A comprehensive stormwater masterplan is critical, drawing from lessons like Mumbai's BRIMSTOWAD project.
5. Proposed Measures: Invest in infrastructure overhaul, use innovative financing like VCF to capture land value increments, and adopt nature-based solutions for better flood management and water conservation.
6. Importance: Sustainable urban planning is essential for economic viability and social resilience, avoiding costly losses from flooding.