Flood alleviation in Gothenburg South-Kungsladugård area with the help of rainwater harvesting/retention : Calculating roof catchment areas and applying rainwater harvesting systems
| Autor: | Salumets, Andres |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
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| Druh dokumentu: | Text |
| Popis: | Sweden like other countries on Earth is also affected by climate warming, including predicted higher levels of precipitation. Due to heavier rains, the occurrence of pluvial flooding may increase. In this particular case, the assessment of flooding in Sweden report states that Gothenburg is one of the cities that is most endangered by flooding and is also one of the cities that most affected by it in urban areas. Hence the arisen need to proactively deal with the issue.The research aimed to see how much water could be harvested and retained in the South-Kungsladugård urban sub-catchment area, which has problems with pluvial flooding. The main objective was to measure hard surface areas and calculate how much water falls into them. Secondary objectives were to propose plausible storage utilities, based on the results obtained. To give the results more context possible utilities for the harvested rainwater in the given area were provided.To reach the objective goals it was needed to have quantitative data. Measuring out the roof areas in the South-Kungsladugård sub-catchment, helped to gather primary data. Other hard surface areas were also quantified to give more context to the researched problem. To perform measuring QGIS software was chosen as the main tool. The image, which was used to take the measurements, was taken from Google Maps. After measurements were taken and processed in QGIS then it was exported into Microsoft (MS) Excel for further calculations and analytics.During the extreme precipitation event, which was taken as an example (32,8mm/24h), the amount of water that could be collected from the roofs was found out to be more than 2 million liters of water. The amount of water harvested is about one quarter of the total water falling onto hard surfaces, which could have a considerable effect on reducing the surface runoff and hence alleviating flooding in the studied area.The sizes of storage utilities that could be used in case of an example rainfall event varied from 2500 liters to 200 000 liters. The most commonly suggested storage utility in correlation with water availability in the case of the example rainfall event was a 5000-liter storage tank.The utility of harvested rainwater is dependent on the household´s type and water usage preference. Further research and analysis is needed to determine more accurate estimation of which kind of measures are needed to put in place, in case of for what the rainwater is going to be used. 2021-06-11 |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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