A study on Rainfall-Runoff Relationship using NRCS-CN and Remote Sensing Technology in Deh Sabz sub basin,

Abstract—Rainfall-runoff relationship is one of the most important phenomena in hydrology design of hydrological structures and drainage systems. Estimation of the runoff is required in order to determine and forecast its effects. Excessive runoff can cause floods with danger to life and property. Excessive runoff can washout the surface soil and because of this agricultural cycle of an area can be damaged forever. In a smaller scale, excessive runoff can disrupt life in residential areas and agriculture in rural areas. The runoff curve number (CN) is a key factor in determining runoff in the NCRS (National Resource Conservation Service) based hydrologic modeling method. The traditional NRCS-CN method for calculating the composite curve number is very tedious and consumes a major portion of the hydrologic modeling time. Therefore, geographi