Abstract
Quantitative understanding and prediction of the processes of runoff generation and its transmission to the outlet represent one of the most basic and challenging areas of hydrology. Traditional techniques for design flood estimation use historical rainfall-runoff data for unit hydrograph (UH) derivation. Such techniques have been widely applied for the estimation of design flood hydrograph at the sites of gauged catchment. For ungauged catchments, unit hydrograph may be derived using synthetic SCS and Snyder unit hydrograph models. This research has been carried out for comparison of the correctness of SCS and Snyder unit hydrograph models in determination of the shape and dimensions of outlet runoff hydrograph in Kasilian watershed. This watershed has 67.5 km2 area and it locates in Mazandaran province of Iran. The runoff hydrographs computed by the SCS and Snyder models were compared with observed hydrographs by using of three error functions, viz. 1-model efficiency (EFF), 2-percentage error in peak (PEP), and 3-percentage error in time to peak (PETP). The results reveal the accuracy and applicability of these synthetic models for derivation of runoff hydrograph.
Highlights
Case Study: In addition to geomorphologic data, the obtained data from several rain falls- run offs events were recorded in the Kasilian watershed
Among methods of estimation of unit artificial hydrographs, the percentage of relative error in time to peak and peak discharge rate of hydrographs obtained from SCS method had 20 and 3% and standard error of 2.95% which shows that this method is suitable for watersheds of without data
Runoff hydrographs computed by using of the SCS and Snyder unit hydrograph (UH) models are compared with the observed Runoff hydrographs for four rainfall-runoff events
Summary
Case Study: In addition to geomorphologic data, the obtained data from several rain falls- run offs events were recorded in the Kasilian watershed. Among common methods for artificial unit hydrographs, SCS and Snyder models can be cited. Among methods of estimation of unit artificial hydrographs, the percentage of relative error in time to peak and peak discharge rate of hydrographs obtained from SCS method had 20 and 3% and standard error of 2.95% which shows that this method is suitable for watersheds of without data.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Applied Sciences and Environmental Management
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
