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Remote Sensing and Gis Applications for Water Resources Planning in Micro-Watershed
Published in Balram Panigrahi, Megh R. Goyal, Modeling Methods and Practices in Soil and Water Engineering, 2017
P.K. Rout, J.C. Paul, B. Panigrahi
The Rh normally increases with decreasing the drainage area and size of watersheds of a given drainage basin. Relief ratio measures the overall steepness of a drainage basin and is an indicator of the intensity of erosion process operating on slope of the basin [28].
Estimation of flood influencing characteristics of watershed and their impact on flooding in data-scarce region
Published in Annals of GIS, 2021
Vikas Kumar Rana, Tallavajhala Maruthi Venkata Suryanarayana
Relief ratio (Rr): The relief ratio is called the maximum relief of the horizontal distance parallel to the main drainage line along the longest dimension of the watershed. It is a good indicator of the intensity of water flows from a catchment slope. It is the measurement of the overall steepness of a watershed. The high Rr implies shorter lag time and the watershed attains higher peak discharge and flow velocities. With increasing relief, steeper hill slopes and higher stream gradients, the time of concentration of runoff decreases, thereby increasing flood peaks (Bhatt and Ahmed 2014). The Rr for the Vishwamitri watershed is 0.01, indicating overall nearly flat terrain or lower slope values. The Rr values for the sub-watersheds range between 0.00 and 0.02. The SW III, SW IV and SW V having 0 Rr indicating a flat terrain with a longer basin length and their influence on the flood is very less. While sub-watersheds SW I and SW II have relatively high values of Rr and contribute more water in a short period of time and cause floods in the lower region of the watershed.
Assessment and analysis of morphometric characteristics of Lake Tana sub-basin, Upper Blue Nile Basin, Ethiopia
Published in International Journal of River Basin Management, 2023
Bitew G. Tassew, Mulugeta A. Belete, K. Miegel
Relief ratio is a dimensionless height–length ratio equal to the tangent of the angle formed by two planes intersecting at the mouth of the basin, one representing the horizontal, and the other passing through the highest point of the basin. It denotes the overall steepness of a drainage basin and is an indicator of the intensity of degradational processes operating on slopes of that basin (Schumm, 1956; Vittala et al., 2004). The relief ratio normally increases with decreasing drainage area and size of sub-watersheds of a given drainage basin (Gottschalk, 1964).