A canal, urban sprawl and wetland loss: The case of Kozhikode, India, from colonialism to climate change era

Wetlands have historically been considered hindrances to development, with ‘reclamation’ considered the appropriate management practice. This is no different in India, where most cities are built on wetlands. This study examines the case of fast urbanising Kozhikode City on the south-west coast of India by overlaying political and developmental interventions of the city with its ecological realities. While pre-colonial settlements in the region were predominantly along the coast leaving the marshy inland areas, the need for resource mobilisation by colonial forces led to the development of Conolly Canal through the wetlands. The spoil bank of the canal spawned the development of roads cutting across the wetlands, a process continuing to this day, with consequent ribbon development. Wetland loss due to reduction in depth, core area loss, fragmentation and salinity intrusion have gone hand in hand with the city's rapid urbanisation. While the looming threat of climate change is forcing Kozhikode's planners to revive the canal, wetlands that sustain the canal (and the city) are buried too far beneath the piecemeal undertakings that have shaped the city. This paper reconstructs the environmental history of the city, the canal and the wetlands from the establishment of the city to the present, spanning a period of 500 years. Determinants of urban growth including canal construction, transport network development in line with the spoil banks and rapid urbanisation processes are chronicled to understand the interconnectedness between ecology, urban sprawl and the rationality of disaster preparedness. In this context, the future development proposals for the region are examined especially with the wetlands as the backdrop. We employ mixed methodologies to track this history including satellite imagery, geographic information systems (GIS), archives and interviews with senior citizens. This framework can be applied to other cities to understand the metabolic relationship of urban growth with ecology and its changing history.