Saha Monjung

For creating flood maps with return periods of 50 and 100 years, using climate projections for 2050 and 2100, it is necessary to use software that can process climate data, hydrological simulations, and flood assessments. Here are some recommended software tools that can assist with this task:

1. HEC-RAS (Hydrologic Engineering Center - River Analysis System)

HEC-RAS is one of the most well-known software packages for modeling hydraulic and hydrological conditions in rivers and watersheds. It is used for flood assessments, calculating water levels under different scenarios, and simulating floods for various return periods (e.g., 50 and 100 years). HEC-RAS allows for the integration of climate data such as rainfall and temperature, which is useful for using climate projections.

• Advantages: Free, widely used in hydrology, allows for flood assessments under various scenarios.
• Disadvantages: May require detailed data handling and model setup.

2. SWMM (Storm Water Management Model)

SWMM is software developed by the EPA (Environmental Protection Agency) that allows for modeling urban and rural watersheds to predict flooding and water quality. It can be used to simulate floods based on different climate scenarios, including climate projections for 2050 and 2100.

• Advantages: Can integrate various climate scenarios, widely used and flexible.
• Disadvantages: More focused on urban watersheds, may not be as detailed for large rivers and watersheds.

3. MIKE FLOOD (DHI)

MIKE FLOOD is an advanced software that allows for integrated flood modeling using data on watercourses, rainfall, and other climate parameters. It is used for analyzing both long-term and short-term flood impacts, including those caused by changes in climate parameters.

• Advantages: Highly detailed, suitable for large watersheds, used globally for flood assessments.
• Disadvantages: Licensing can be expensive, requires high computational power.

4. Flood Modeller

Flood Modeller is a tool specialized in flood modeling, including assessments for different return periods. It supports the input of climate data and can integrate future climate changes for flood impact analysis. It supports various data types such as rainfall, water levels, land use, etc.

• Advantages: Good for use in various conditions, intuitive interface.
• Disadvantages: Can be more expensive than other options, depends on the size and complexity of the model.

5. XPSWMM (XP Solutions)

XPSWMM is another advanced software used for modeling watercourses, rainfall, and floods. It allows the import of climate data and running analyses based on future climate projections.

• Advantages: Adaptable for various types of watersheds, integrates with GIS tools.
• Disadvantages: Licensing can be expensive, requires a high level of expertise for optimal use.

6. GIS Software (ArcGIS, QGIS)

For spatial analysis and visualization of flood data, you can use GIS software such as ArcGIS or QGIS. These tools allow for the integration of climate and hydrological data and can be used to create flood maps based on long-term climate scenarios. When combined with other flood modeling software, GIS tools can be very useful.

• Advantages: Strong visualization capabilities, easy integration with various models.
• Disadvantages: Cannot directly model floods but can be useful for analysis and visualization.

Recommendation:

For your case, I recommend HEC-RAS for flood modeling with climate projections, along with additional analysis in GIS tools like QGIS for spatial analysis and visualization. If you have access, MIKE FLOOD is suitable for more detailed simulations in larger watersheds, while SWMM is useful if you're focusing on urban watersheds.

Proper model calibration and accurate input of climate data are essential for obtaining precise results.

Hec-Ras

The use of appropriate software is important, but beyond that, you should consider time series analysis to project return period scenarios based on such performance. I recommend the ARIMA model for making those estimations.