Estimation of the runoff of the hills of the city of Portoviejo-Ecuador to assess the degree of flooding in the region

Portoviejo, capital of the province of Manabi is one of the oldest cities on the Ecuadorian coast. It is characterized by a stable temperate climate with an average annual temperature of around 24°C, with annual rainfall patterns of up to 500 mm. It is a city located in a valley, with average height of 40 m. It is surrounded by hills that have heights that reach up to 280 meters above sea level, which potentiates that the continuous runoffs that occur in the rainy season causes problems related to landslides and floods in the lower part. In the present work an estimation of the runoff coming from the hills located in the northeastern areas of the city where the parishes and citadels Progreso, Cevallos, San Pablo and Briones are located. The capacity of conduction of existing rainwater collectors in comparison with the runoff values obtained is also analyzed. The results obtained constitute an approximation of runoff values for return periods of 1, 2, 5, 10, 20, 50 and 100 years, which are an input for the repowering of existing works and for the design of infrastructure works complementary to the control of floods and landslides in the area. © Published under licence by IOP Publishing Ltd.