Physiographic Study for Hydrology of Benowo Region Surabaya

This study seeks to identify the physiographic characteristics based on slope and land use that influence water management in the Benowo area of Surabaya. This research utilized DEM data and Landsat 8 data. Slope analysis and land use analysis were employed in the data processing procedure. The slope classification map yielded five categories: flat, sloping, slightly steep, steep, and very steep. The land classification map featured five categories: agriculture, settlements, industrial, plantations, and waters. Based on the slope and land use, a flow coefficient analysis was performed. The average flow coefficient for the Benowo area of Surabaya was 0.35, which was categorized as a medium flow coefficient, and 65 percent of the water was absorbed by the soil below the surface. Changes in land function in the Benowo region, from agriculture and water to residential or industrial, will have a significant impact on the flow coefficient value. Changes in land function result in increased surface runoff. Water management is a crucial aspect of development planning. This study's findings provide a foundation for hydrological engineering, development, improvement, utilization, and control of water flow, particularly in the Benowo area of Surabaya.