Silvan in context: Street-network sprawl trends

Silvan in context

1.82.12.42.73<19751976–19901991–20052006–2020SNDi of street additions
1.82.12.42.73<19751976–19901991–20052006–2020SNDi of entire street network
SilvanDiyarbakir (Region)Turkey (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Silvan plotted against Diyarbakir and Turkey. The SNDi of new construction in Silvan was at its lowest in 1976-1990, compared to Diyarbakir which peaked in 1976-1990 and Turkey which followed a zig-zag trend with an overall increase. Most recently, Silvan's incremental SNDi rose from 2.61 to 2.71 between 1991-2005 and 2006-2020. In terms of the aggregate network, Silvan ranked 4th out of 5 cities in Diyarbakir and 123rd out of 174 in Turkey as of 2020.

New Street Additions (2006–2020)

SNDi value
2.71
Rank in Turkey
123rd of 174
Rank in Diyarbakir
4th of 5

Entire Network (Aggregate)

SNDi value
2.49
Rank in Turkey
123rd of 174
Rank in Diyarbakir
4th of 5

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

What about similarly populated cities?

0.71.42.12.8<19751976–19901991–20052006–2020SNDi of street additions
0.71.42.12.8<19751976–19901991–20052006–2020SNDi of entire street network
SilvanTafasBozuyuk

In new street additions, Silvan built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns, while Tafas built increasingly disconnected streets from 1975 through 1991-2005, then improved and Bozüyük fluctuated in its street-construction patterns. For the full network, Silvan became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards, while Tafas grew more disconnected from 1975 through 1991-2005, then improved and Bozüyük became progressively more disconnected. Silvan and Bozüyük have been converging in their street-network character since 1975.