Owerri in context: Street-network sprawl trends

Owerri in context

33.544.5<19751976–19901991–20052006–2020SNDi of street additions
33.544.5<19751976–19901991–20052006–2020SNDi of entire street network
OwerriImo (Region)Nigeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Owerri plotted against Imo and Nigeria. The SNDi of new construction in Owerri rose steadily, compared to Imo which rose steadily and Nigeria which followed a zig-zag trend with an overall increase. Most recently, Owerri's incremental SNDi rose from 4.37 to 4.47 between 1991-2005 and 2006-2020. In terms of the aggregate network, Owerri ranked 2nd out of 5 cities in Imo and 261st out of 422 in Nigeria as of 2020.

New Street Additions (2006–2020)

SNDi value
4.47
Rank in Nigeria
231st of 422
Rank in Imo
2nd of 5

Entire Network (Aggregate)

SNDi value
3.58
Rank in Nigeria
261st of 422
Rank in Imo
2nd of 5

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

What about similarly populated cities?

2.83.54.24.95.6<19751976–19901991–20052006–2020SNDi of street additions
2.83.54.24.95.6<19751976–19901991–20052006–2020SNDi of entire street network
OwerriKathmanduAlgiers

In new street additions, Owerri and Kathmandu both built increasingly disconnected streets over time, while Algiers fluctuated in its street-construction patterns. For the full street network, though, all three cities follow the same trend.