Improving the Hydraulic Conveyance of a Road Drainage: A Case Study of Naluuma Road, Nansana-Nabweru
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Date
2025-04-16
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Uganda Christian University
Abstract
This research project focused on improving the hydraulic conveyance of Naluuma road drainage channel in Nansana-Nabweru, Uganda. The study involved determining the existing conditions of the road drainage channel, determining the peak discharge of the catchment, sufficiently sizing the drainage channel through hydraulic calculations and providing suitable cost estimates with a bill of quantities (BOQ) To achieve these objectives, site visits and topographic surveys were conducted, channel measurements were taken and the catchment area was demarcated using ArcGIS, QGIS and a Digital Elevation Model (DEM). Rainfall data was acquired from Uganda National Meteorological Association (UNMA) to generate intensity duration frequency (IDF) curves, utilizing the theoretical extreme value (EV) distribution, which were used to determine the design storm and estimate rainfall events hence arriving at rainfall intensities. Using the rational method, the peak discharges were calculated. A bill of quantities was also generated in reference to prices and benefits of the various materials or equipment used. A total channel length of 803m was divided into three sections based on terrain slope and flow characteristics. Parameters such as runoff coefficients, rainfall intensities and catchment areas were determined to finally come up with peak discharges for the respective sections the uphill section(330m), midhill(300m) and downhill(180m). Results obtained from the third objective such as top and bottom widths, flow depth, and discharges from objective two were input into HECRAS software to run a supercritical hydraulic simulation of the modified channel. The results highlighted sections of the channel that were prone to overflow under extreme discharge scenarios. Based on these findings, recommendations were made on channel dimensions and possible lining materials to enhance flow capacity and reduce erosion risk hence mitigating the flooding problem of Naluuma.
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Undergraduate