Modelling surface runoff using the soil conservation service-curve number method in a drought prone agro-ecological zone in Rwanda

作     者：Dieudonne Uwizeyimana Stephen M.Mureithi Simon M.Mvuyekure George Karuku Geoffrey Kironchi 

作者机构：Department of Land Resource Management and Agricultural TechnologyUniversity of NairobiP.O Box 2905300625 NairobiKenya Ministry of Agriculture and Animal Resources of RwandaP.O.Box 6961KigaliRwanda Rwanda Agriculture and Animal Resources Development BoardP.O.Box 5016KigaliRwanda 

出 版 物：《International Soil and Water Conservation Research》 (国际水土保持研究（英文）)

年 卷 期：2019年第7卷第1期

页      面：9-17页

核心收录：

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

基　　金：supported by the United States Agency International Development(USAID)''Rwanda'',as part of the Feed the Future initiative,under the CGIAR Fund the predecessor funds the Food Security and Crisis Mitigation II grant,''Rwanda'' 

主　　题：Available rainwater Cyili sub-Catchment Curve number Runoff Rwanda 

摘      要：Runoff farming is reported to improve land productivity and crop yields in hot and dry *** study was conducted to assess the available rainwater that can be harvested in a conserved catchment in a drought prone agro-ecological *** study was carried out in the Cyili sub-catchment,southern province of Rwanda,which has an irregular rainfall pattern and unexploited runoff *** Conservation Service-Curve Number method (SCS-CN),CROPWAT model version 8 and Hazen model with an average daily rainfall data recorded from 1971 to 2016 were applied to estimate the runoff and water requirements in the study *** of the study revealed that more than half rainfall water received in the catchment was lost through runoff (229.8 mm) and effective rainfall was lower (246.9 mm) than the actual crop water requirement for maize (330 mm).The expected seasonal surface runoff volume to be harvested by the farmers was 3008 m3 ha-1 per season and 1.29 × 106 m3 per season for the entire whole sub-catchment (430 ha).Based on Hazen model,the return period of low rainfall (dry spell) event would be expected every 2 years with a 98% probability of *** sub-catchment has higher potential runoff volume to stabilize the deficit of water demand in the period of short rainy *** suggests that rainwater harvesting through supplementary irrigation is an option to improve the crop yield in the dry period as well as in the annual dry season.