Dalkola in context: Street-network sprawl trends

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Dalkola plotted against West Bengal and India. The SNDi of new construction in Dalkola rose steadily, compared to West Bengal which followed a zig-zag trend with an overall increase and India which followed a zig-zag trend with an overall increase. Most recently, Dalkola's incremental SNDi rose from 6.09 to 6.99 between 1991-2005 and 2006-2020. In terms of the aggregate network, Dalkola ranked 98th out of 140 cities in West Bengal and 1645th out of 1868 in India as of 2020.

Rankings go from most connected to most disconnected — rank 1 is the most connected.

What about similarly populated cities?

• Jia, China
• Tacheng, China
• Suizhong, China
• Haveri, India
• Shahrud, Iran
• Idi-Iroko, Nigeria

In new street additions, Dalkola built increasingly disconnected streets over time, while Jia fluctuated in its street-construction patterns and Haveri built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Dalkola and Haveri both became progressively more disconnected, while Jia fluctuated in connectivity. Dalkola and Haveri have been growing further apart in their street-network character since 1975.