Chanchal 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 Chanchal plotted against West Bengal and India. The SNDi of new construction in Chanchal peaked in 1991-2005, 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, Chanchal's incremental SNDi fell from 4.1 to 1.92 between 1991-2005 and 2006-2020. In terms of the aggregate network, Chanchal ranked 27th out of 140 cities in West Bengal and 812th 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?

• Raghopur, India
• Pisco, Peru
• Chone, Ecuador
• Lingshou, China
• Nahavand, Iran
• Neuwied, Germany

In new street additions, Chanchal built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Raghopur built increasingly disconnected streets over time and Lingshou built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Chanchal and Lingshou both grew more disconnected from 1975 through 1991-2005, then improved, while Raghopur became progressively more disconnected. Chanchal and Raghopur have been converging in their street-network character since 1975.