City of Oakwood Flood Potential Model

Flood Potenital Analysis

Author: Clarence D Brookins-Jackson

Background

The following project was conducted in partnership with the City Of Gainesville. The internship started with using LiDAR data to look at land for potential development. Due to the timing of the conducted flight and our base station at the University of North Georgia we weren't able to get the reference data needed to finish post-processing the LiDAR data. So I started thinking of other ways I may be able to contribute to the developemnt of this new area. I decided to look at flood potential after taking a hydrology course over the summer. While working for the City O f Oakwood I learned how to use ESRI ArcPro Model builder to create my own workflow from scratch to generate 10 different map layers each one dealing with a weighted characteristic that contributes to flooding.

Flood Model

The flood model was created in ArcPr Model Builder. Each tool is ran individually in chain to create the final outputs. ArcPro Model Builder uses python in the background and helps increase work flow and efficiency.

Land Use Map

The map shows different land uses for all of Hall County, Georgia. Each land use was categorized and weighted on flood probability and contribution to flooding which is why the legend is ranging from 1- 6. 1 is the highest and 6 is the lowest. You can note that the highest is water and that is due to the ability of many standing bodies of water to have the highest possibility to flood.

Temperature Map

Temperature map was used to indicate areas of high heat. High heat can contribute to an increase in evapotranspiration which can lead to increase chance in precipitation. The areas over the lake were warmer due to the body of water being warmer since this study was conducted over the summer,

Average Evapotranspiration Map

The AET Map shows the weighted flood potential of evapotranspiration in 3 distinct categories. Again these were categorized on a scale of 1 - 3 with 1 being the highest and 3 being the lowest.

Precipitation Map

Precipitation Map shows 3 areas in which there is rainfall and where most of that rainfall accumulates. The scale is the same as the Evapotranspiration Map. The precipitation is also weighted to contribute to the flood potential with the urban areas of Hall County having the highest potential due to the amount of impervious surfaces.

Temperature Flood Potential Map

The Temperature Flood Potential Map showcases the potential for the temperature to contribute to flooding through evapotranspiration. It is higher over the water bodies and partial urban areas but declines towards the east of the county. A reason for the high overwater is its more likely to have evaporation than the urban areas as there isn't always water on the surface.

Water Storage and Flood Potential

The Final product of this project was the Flood Potential Map. The map shows areas at risk of flooding based on the weight attributes above. The model that was built takes into consideration all the layers and datasets produced and placed them into a weighted sum tool in ArcPro where I assigned their values on probability. The map shows high-risk areas as red, moderate-risk areas as yellow, and low-risk as green.

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