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Abstract. The water levels of lakes along the eastern route of the
South-to-North Water Diversion Project (ER-SNWDP) are expected to rise
significantly and subsequently affect the processes of flood control and
drainage in corresponding lake basins. However, few studies have focused on
the impacts of inter-basin water diversion on the flood control and drainage
of water-receiving areas at the lake basin scale. Using MIKE software, this
paper builds a coupled hydrodynamic model to address the existing literature
gap regarding the impacts of inter-basin water diversion on the processes of
flood control and drainage in a water-receiving lake basin, and it considers
the many types of hydraulic structures in the model. First, a flood
simulation model was constructed to simulate the complex movement of water
transferred by the ER-SNWDP, by waterlogging in the lakeside area around
Nansi Lake (NL), and water in NL and its tributaries. The ER-SNWDP was also
considered in the model. Second, the model was calibrated and verified with
measurement data, and the results showed that the model was efficient and
presented a Nash–Sutcliffe efficiency coefficient (NSE) between 0.65 and
0.99. Third, the processes of flooding and draining in the lakeside area of
NL were simulated under different water diversion and precipitation values.
Finally, the impacts of the emergency operations of the ER-SNWDP on flood
control and waterlogging drainage in the lakeside area of NL were analysed
based on the results from the proposed model, and some implications are
presented for the integrated management of inter-basin water diversion and
affected lakes.

A strong relationship between night-time light (NTL) data and the areal extent of urbanized regions has been observed frequently. As urban regions have an important vertical dimension, it is hypothesized that the strength of the relationship with NTL can be increased by consideration of the volume rather than simply the area of urbanized land. Relationships between NTL and the area and volume of urbanized land were determined for a set of towns and cities in the UK, the conterminous states of the USA and countries of the European Union. Strong relationships between NTL and the area urbanized were observed, with correlation coefficients ranging from 0.9282 to 0.9446. Higher correlation coefficients were observed for the relationship between NTL and urban building volume, ranging from 0.9548 to 0.9604; The difference in the correlations obtained with volume and with area was statistically significant at the 95% level of confidence. Studies using NTL data may be strengthened by consideration of the volume rather than just area of urbanized land.