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Urbanization and hydrology have an interactive relationship, as urbanization changing the  hydrology  of  a  system  and  the  hydrology  commonly  causing  structural  damage  to  the infrastructure. Hydrological modelling  has  been  used  to  quantify  the water  causing  structural impacts, and to provide solutions to the issues. However, in already‐urbanized areas, creating a soil map to use as input in the modelling process is difficult, as observation positions are limited and visuals of the natural vegetation which indicate soil distribution are unnatural. This project used historical satellite images in combination with terrain parameters and digital soil mapping methods to produce an accurate (Kappa statistic = 0.81) hydropedology soil map for the Cosmo City suburb in  Johannesburg,  South Africa.  The map was  used  as  input  into  the HYDRUS  2D  and  SWAT hydrological models to quantify the water creating road damage at Kampala Crescent, a road within Cosmo City (using HYDRUS 2D), as well as the impact of urbanization on the hydrology of the area (using  SWAT). HYDRUS  2D modelling  showed  that  a  subsurface  drain  installed  at  Kampala Crescent would need a carrying capacity of 0.3 m3.h−1.m−1 to alleviate the road damage, while SWAT modelling  shows  that  surface  runoff  in Cosmo City will  commence with  as  little  rainfall  as  2 mm.month−1. This project showcases the value of multidisciplinary work. The remote sensing was invaluable to the mapping, which informed the hydrological modelling and subsequently provided answers to the engineers, who could then mitigate the hydrology‐related issues within Cosmo City.

remote sensing

Combining Historical Remote Sensing, Digital Soil Mapping and Hydrological Modelling to Produce Solutions for Infrastructure Damage in Cosmo City, South Africa