Management and disposal of surface runoff using geographic information system and fuzzy method (Case study: Bandar Imam Khomeini)

The purpose of building surface water collection networks is to enhance the resilience of cities against unexpected events such as floods and to improve overall urban health. Recent rainfalls in Bandar Imam Khomeini have exposed vulnerabilities, leading to severe flooding in roads and streets due to the absence of canals and surface drainage systems. The problem has caused significant damage to the infrastructure of the region. The research aims to implement a runoff management system using the Geographic Information System in Bandar Imam Khomeini. For this purpose, digital layers of the area, including elevation, slope, direction of slope, and drainage network of the city were prepared using the Geographic Information System. The fuzzy logic method was then employed to identify areas with the potential for runoff accumulation in the region. The research findings indicate that these areas are concentrated in the east, center, northeast, and southeast of the region. Then, using the RiverTools technique and according to the map of the city's drainage network, the best routes for constructing proposed canals were determined. These canals include sub-canals, second-order main canals, and third-order main canals. The first-order canal is the main conduit that collects the water of the second and third order canals.