Volume 21, Issue 4 (Winter 2018)                   jwss 2018, 21(4): 15-28 | Back to browse issues page

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Mostafazadeh R, Mirzaei S, Nadiri P. Curve Number Determination using Rainfall and Runoff Data and its Variations with Rainfall Components in a Forested Watershed. jwss 2018; 21 (4) :15-28
URL: http://jstnar.iut.ac.ir/article-1-3289-en.html
1. Dept. of Range & Watershed Manage. Faculty of Agric. & Natural Resour., Mohaghegh Ardabili Univ., Ardabil. Iran. , raoofmostafazadeh@yahoo.com
Abstract:   (7778 Views)
The SCS-CN developed by the USDA Soil Conservation Service is a widely used technique for estimation of direct runoff from rainfall events. The watershed CN represents the hydrological response of watershed as an indicator of watershed potential runoff generation. The aim of this research is determining the CN from recorded rainfall-runoff events in different seasons and analyzing its relationship with rainfall components in the Jafarabad Watershed, Golestan Province. The CN values of 43 simultaneous storm events were determined using SCS-CN model and the available storm events of each season have been separated and the significant differences of CN values were analyzed using ANOVA method. The Triple Diagram Models provided by Surfer software were used to analyze the relationships of CNs and rainfall components. Results showed that the mean values of CN were 60 for summer and winter seasons and the CN values in the spring and autumn seasons were 50 and 65, respectively. The inter-relationships of CN amounts and rainfall characteristic showed that the high values of CNs were related to high rainfall intensities (>10 mm/hr) and rain-storms with total rainfall more than 40 mm. Also the CN values were about >70 for the storm events with 40-80% runoff coefficient values.
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Type of Study: Research | Subject: Ggeneral
Received: 2016/05/28 | Accepted: 2016/11/16 | Published: 2018/02/7

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