Umuahia in context: Street-network sprawl trends

Umuahia in context

2.83.54.24.9<19751976–19901991–20052006–2020SNDi of street additions
2.83.54.24.9<19751976–19901991–20052006–2020SNDi of entire street network
UmuahiaAbia (Region)Nigeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Umuahia plotted against Abia and Nigeria. The SNDi of new construction in Umuahia peaked in 1991-2005, compared to Abia which rose steadily and Nigeria which followed a zig-zag trend with an overall increase. Most recently, Umuahia's incremental SNDi fell from 4.11 to 3.98 between 1991-2005 and 2006-2020. In terms of the aggregate network, Umuahia ranked 3rd out of 9 cities in Abia and 249th out of 422 in Nigeria as of 2020.

New Street Additions (2006–2020)

SNDi value
3.98
Rank in Nigeria
187th of 422
Rank in Abia
2nd of 9

Entire Network (Aggregate)

SNDi value
3.48
Rank in Nigeria
249th of 422
Rank in Abia
3rd of 9

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

What about similarly populated cities?

23456<19751976–19901991–20052006–2020SNDi of street additions
23456<19751976–19901991–20052006–2020SNDi of entire street network
UmuahiaOttawaBrahmapur

In new street additions, Umuahia built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Ottawa built increasingly disconnected streets from 1975 through 1976-1990, then improved and Brahmapur built increasingly disconnected streets over time. For the full street network, though, all three cities follow the same trend. Umuahia and Ottawa have been growing further apart in their street-network character since 1975.