Generation of Synthetic Design Storm Hyetograph and Hydrologic Modeling under HEC HMS for Ziz Watershed

Abstract

This article proposes a methodology for generating hourly rainfall from daily rainfall data. It was evolved as a tool for managing flood risks on Ziz catchment, by means of Intensity-duration-frequency curves (IDF) and designed hyetograph of Chicago. The study area is located in the south-eastern part of Morocco, and did not have a monitoring station for hourly rain measure, the methodomogy consist of determinating the rainfall intensity for 24 h using IDF, then estimating the hourly rainfall using Chicago formula, in order to assess the accuracy of the method the resulting hyetographs was introduced into the semi-distributed hydrological model HEC HMS to simulate hourly flow, which was compared to the observed one. The obtaining results exhibit that the observed value is positively correlated with those obtained by the above method, as shown by the correlation coefficient and the Nash-Sutcliffe. This approach can deal with instantaneous water management issues by tackling flood risks and providing an appropriate range of data for the dam’s management.

Deriving location-specific synthetic seasonal hyetographs using GPM records and comparing with SCS curves

“…Similar regional-specific hyetographs for other parts of the globe are the true need of the hour, where a downscaled spatio-temporal scale is carved and the above end deliverables are synthesized. Synthetic hyetographs have emerged as a valuable tool for hydrological modelling and water resource management, as demonstrated in previous studies (Sivapalan et al 2003;Viglione et al 2016;Elhassnaoui et al 2019;Ram et al 2023). These hyetographs can be employed to simulate rainfall events in regions with limited observed data, leading to more accurate estimations of flood risk and design flood hydrographs (Lin et al 2005;Kimura et al 2014;Elhassnaoui et al 2019;Wartalska & Kotowski 2020).…”

“…Synthetic hyetographs have emerged as a valuable tool for hydrological modelling and water resource management, as demonstrated in previous studies (Sivapalan et al 2003;Viglione et al 2016;Elhassnaoui et al 2019;Ram et al 2023). These hyetographs can be employed to simulate rainfall events in regions with limited observed data, leading to more accurate estimations of flood risk and design flood hydrographs (Lin et al 2005;Kimura et al 2014;Elhassnaoui et al 2019;Wartalska & Kotowski 2020). Furthermore, they can be utilized to evaluate the impact of climate change on flood risk and enhance the precision of flood forecasting models.…”

Management of water scarcity in arid areas: a case study (Ziz Watershed)

“…The key input parameters of this study are the instantaneous precipitation. The precipitation temporal downscaling method used to downscale daily precipitation was conducted using a syn-thetic design storm hydrograph, developed by (Elhassnaoui et al, 2019). The approach consists of the mixture of the Intensity-duration-frequency curves (IDF) and the designed hyetograph of Chi-cago (Elhassnaoui et al, 2019…”

“…In this study, we used the same hydrological model calibrated and validated by (Elhassnaoui et al, 2019) in the same watershed under HEC-HMS.…”