Street-network Sprawl in 浠水县, China

What is Street-network sprawl?

Street-network Sprawl is a way to measure urban sprawl, worldwide, through the connectedness of the streets. Less sprawl means more connected, more walkable streets. Well-connected streets – like New York City’s grid – are more walkable and can be served by public transit.

The street network is permanent, and its connectivity affects the livability and environmental footprint of cities for decades and centuries to come. In places with more connected streets, residents drive less and walk more. A well-connected street network is associated with better outcomes for health, the environment, sustainable consumption, social integration, and equity.

We can quantify how connected street networks are with the Street Network Disconnectedness Index (SNDi).

SNDi -- our measure of street-network sprawl (disconnectedness)

The SNDi is a comprehensive measurement of “sprawl”. It captures:

A higher SNDi means less-connected streets – i.e., more sprawl. For the 10137 cities in our dataset, the average SNDi is 2.25, with half of the cities' SNDis falling between 1.08 and 3.25.

More information on the sprawl index can be found in these research papers:

To see the state of street-network sprawl across the globe, visit the sprawlmap.

浠水县: city in Hubei, China

What exactly constitutes the spatial extent of the city? For these aggregations, we used the Global Human Settlement Layer Urban Center Database (GHS-UCDB) to define the boundaries of the city. These cities -- or urban centers -- cover areas that are densely populated and built-up, and so may extend beyond the spatial borders of these cities that we may be familiar with. The GHS area is shaded in blue.

View 浠水县, China on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in 浠水县 as of 2014, the overall level of street-network sprawl is 1.32, which is relatively well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are -0.25, 1.56, 1.5 and 1.15. Street construction in 浠水县 increased in disconnectivity initially but has since improved. The streets constructed in 1976-1990 were the most disconnected.

Quantity of street network construction: The street network in 浠水县 spans a total of 150 kilometers. It is dominated by roads constructed in 1976-1990. These roads have an SNDi of 1.56, which is relatively well-connected.

Effect on the aggregate network: New construction in each period adds to the total stock of streets, but does not change streets that have already been built. Therefore, it has a limited effect on the street network as a whole. The SNDis of the aggregate street network in the respective time periods are -0.25, 1.27, 1.3 and 1.32. Overall, the SNDi of the aggregate street network has risen: the street network in 浠水县 has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 1.52 points, but between 1991-2000 and 2001-2014, it rose by just 0.02.

浠水县 and Hubei follow the same trend in the disconnectivity of their street network constructions. The SNDi for both of these peaked in 1976-1990.

How do development practices in 浠水县 fare in comparison to others in Hubei? Most recently in 2001-2014, street construction in 浠水县 was the 50th-most disconnected out of the 80 cities in Hubei. Its position in the ranks since 1975 has risen; relative to other cities in Hubei, street construction in 浠水县 has become more disconnected. 浠水县 ranked 59th in 1975, 45th in 1976-1990, 41st in 1991-2000 and 50th in 2001-2014.

浠水县 and China do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in 浠水县 peaked in 1976-1990, while the SNDi of street constructions in China followed a zig-zag trend with an overall decrease.

How do development practices in 浠水县 fare in comparison to others in China? Most recently in 2001-2014, street construction in 浠水县 was the 956th-most disconnected out of the 1651 cities in China. Its position in the ranks since 1975 has risen; relative to other cities in China, street construction in 浠水县 has become more disconnected. 浠水县 ranked 1166th in 1975, 838th in 1976-1990, 629th in 1991-2000 and 956th in 2001-2014.

浠水县 and Hubei do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in 浠水县 rose steadily, while the SNDi of street constructions in Hubei peaked in 1976-1990.

To date, 浠水县 is the 53rd-most disconnected out of the 80 cities in Hubei. Its position in the ranks since 1975 has risen; relative to other cities in Hubei, the street network in 浠水县 has become more disconnected. 浠水县 ranked 59th in 1975, 50th in 1976-1990, 52nd in 1991-2000 and 53rd in 2001-2014.

浠水县 and China do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in 浠水县 rose steadily, while the SNDi of street constructions in China peaked in 1976-1990.

To date, 浠水县 is the 1050th-most disconnected out of the 1651 cities in China. Its position in the ranks since 1975 has risen; relative to other cities in China, the street network in 浠水县 has become more disconnected. 浠水县 ranked 1166th in 1975, 1006th in 1976-1990, 1007th in 1991-2000 and 1050th in 2001-2014.

As of 2015, 浠水县 had a built-up area of 8.54 square kilometers, and a population of 193097 people.

These are some other cities with approximately the same population: