Preparation and analysis of flood risk map using HEC RAS and RAS MAPPER hydraulic model (Case study: Sok Cham river of Kashan)

Document Type : Research Article


1 Ph.D. Student in Watershed Management Science and Engineering, Kashan University, Kashan, Iran

2 Professor in Watershed Management Engineering, Kashan University, Kashan, Iran

3 Assistant Professor in Watershed Management Engineering, Kashan University, Kashan, Iran


Floods are a common natural disaster that can endanger urban and rural infrastructure. The purpose of this study was to prepare and analyze the flood risk map of Khancheh and Baronagh villages along a part of Suk Cham river. First, the topographic map was created using Google Earth and Global mapper. Then, using a topographic map made in AutoCAD Civil 3D software, the surface was created for the study interval. In the next step, using the constructed surface of cross sections, longitudinal profiles, river channel, right, and left flood banks of Suk Cham river were constructed in AutoCAD Civil 3D software environment. To simulate floods at return periods of 25, 50, 100, and 200 years, the cross sections were transferred to HEC RAS software. The Phil-Steiner method was used to convert the maximum daily flow rate to the maximum instantaneous flow rate according to the P-value of the Kolmogorov-Smirnov test (0.9). The results of flood frequency analysis showed that Pearson type 3 log distribution is the most suitable distribution. Based on the results, the flooding level for the return periods of 25, 50, 100, 200 years was 0.77, 0.9, 1.15, 1.47 km2, respectively. According to the flood risk map in the 100-year return period (high risk area), about 41.5% and 4.5% of the two villages of Khancheh and Baronagh had at moderate to very high risk of flood, respectively. Establishing coastal walls and organizing the river along the river route through these two villages is essential, which can mitigate the risks of floods. The use of prepared plans for flood control measures, flood forecasting and warning systems, flood insurance and in general for structural and non-structural flood control measures in the region is recommended.

Graphical Abstract

Preparation and analysis of flood risk map using HEC RAS and RAS MAPPER hydraulic model (Case study: Sok Cham river of Kashan)


 حجازی، اسد اله؛ خدائی قشلاق، فاطمه؛ خدائی قشلاق، لیلا؛ 1398. پهنه‌بندی خطر وقوع سیلاب در حوضه‌ی آبریز ورکش چای با استفاده از نرم‌افزار HEC-RAS و الحاقیه HEC-GEO-RAS. تحقیقات کاربردی علوم جغرافیایی، شماره 53. صص 56-137.
دلیران فیروز، هدی؛ مختار خوزانی، فهیمه؛ سلطانی، سعید؛ موسوی، سید علیرضا؛ 1394. ارزیابی خسارات ناشی از سیل در حوزه‌های آبخیز قمصر و قهرود با استفاده از نرم‌افزار HEC-FIA. علوم و فنون کشاورزی و منابع طبیعی. علوم آب‌وخاک، شماره 74. صص 63-76.
زراعتکار، زهرا؛ حسن‌پور، فرزاد؛ 1395. شبیه‌سازی سیلاب شهری بیرجند با استفاده از مدل HEC-RAS و ARC-GIS. پژوهش‌های آبخیزداری (پژوهش و سازندگی)، شماره 112. صص 41-56.
سازمان مدیریت و برنامه­ریزی کشور، وزارت نیرو؛ 1384. راهنمای پهنه­بندی سیل و تعیین حد بستر و حریم رودخانه. نشریه شماره 307.
شعبانلو، سعید؛ رجبی، احمد؛ اسلامیان، سید سعید؛ موسوی، سید فرهاد؛ 1391. ارزیابی روابط تجربی برآورد دبی اوج لحظه‌ای سیلاب در حوضه‌های آبریز غرب ایران. پژوهش آب ایران، شماره 10. صص 215-219.
قنواتی، عزت اله؛ احمد آبادی، علی؛ غلامی، معصومه؛ 1398. شبیه‌سازی پهنه‌های سیل گیر در حوضه‌های آبریز کلان شهر تهران (حوضه کن). تحلیل فضایی مخاطرات محیطی، شماره 4. صص 95-108.
معیری، مسعود؛ انتظاری، مژگان؛ 1387). سیلاب و مروری بر سیلاب‌های استان اصفهان. فصلنامه چشم‌انداز جغرافیایی، شماره 6. صص 111-124.
مهرورز، ارسلان؛ مددی، عقیل؛ اسفندیاری در آباد، فریبا؛ رحیمی، مسعود؛ 1399. شبیه‌سازی سیلاب‌های رودخانه دره ائورت با استفاده از مدل هیدرولیکی HEC-RAS در محیط GIS (محدوده موردمطالعه: از روستای شورستان تا تلاقی رودخانه ارس). پژوهش‌های ژئومورفولوژی کمی، شماره 4. صص 131-146.
Aynalem SB., 2020. Flood Plain Mapping and Hazard Assessment of Muga River by Using ArcGIS and HEC-RAS Model Upper Blue Nile Ethiopia. Landscape Architecture and Regional Planning 5: 74-85.
Azouagh AEl, Bardai R, Hilal I, El Messari JS., 2018.  Integration of GIS and HEC-RAS in Floods Modeling of Martil River (Northern Morocco). Eur. Sci. J 14: 130-142.
Chow VT. 1959. Open-channel hydraulics. McGraw-Hill civil engineering series.
Dorji K, Dorji K, Choosumrong S., 2019. River Flood modeling of Amochu River using GIS and HEC-RAS: A case study in Phuntsholing city, Chukha, Bhutan. Naresuan University.
Fill HD, Steiner, AA., 2003. Estimating instantaneous peak flow from mean daily flow data. Journal of Hydrologic Engineering 8: 365-369.
Ibrahim NF, Zardari NH, Shirazi SM, Mohd Haniffah M, Mat Talib S, Yusop Z, Mohd Yusoff S., 2017. Identification of vulnerable areas to floods in Kelantan River sub-basins by using flood vulnerability index. International Journal of GEOMATE 12: 107-114.
Khattak MS, Anwar F, Saeed TU, Sharif M, Sheraz K, Ahmed A., 2016. Floodplain mapping using HEC-RAS and ArcGIS: A case study of Kabul River. Arabian Journal for Science and Engineering 41: 1375- 1390.
Kim V, Tantanee S, Suparta W., 2020. GIS-BASED Flood Hazard Mapping Using HEC-RAS Model: A Case Study of Lower Mekong River, Camboda. Geographia Technica 15: 16-26.
Mcluckie D, Babister M, Smith G, Thomson R., 2014. Updating national guidance on best practice flood risk management. Paper presented at the Proc. Floodplain Management Association Annual Conference. Deniliquin, Australia.
Ongdas N, Akiyanova F, Karakulov Y, Muratbayeva A, Zinabdin N., 2020. Application of HEC-RAS (2D) for flood hazard maps generation for Yesil (Ishim) river in Kazakhstan. Water 12:  1-20.
Rangari VA, Sridhar V, Umamahesh N, Patel AK., 2019. Floodplain mapping and management of urban catchment using HEC-RAS: a case study of Hyderabad City. Journal of The Institution of Engineers (India): Series A 100: 49-63.
Sangal BP. 1983. Practical method of estimating peak flow. Journal of Hydraulic Engineering, 109: 549-563.
Tan WL, Liew WS, Ling L., 2021. Statistical modelling of extreme rainfall in Peninsular Malaysia. Paper presented at the ITM Web of Conferences 36: 1-12.
Vojtek M, Petroselli A, Vojteková J, Asgharinia S., 2019. Flood inundation mapping in small and ungauged basins: sensitivity analysis using the EBA4SUB and HEC-RAS modeling approach. Hydrology Research, 50: 1002-1019.