Storm Drainage Design Project and Flooding - Assignment Example

Only on StudentShare

Extract of sample
Storm Drainage Design Project and Flooding

Surface streams and groundwater flows and the wetness of soil before a the storm are the factors to be considered. According to Dr Tim Stott, rainfall prediction is a matter of statistics. No one can predict what the rainfall and catchment conditions will be in the future. With climate change, past records are not reliable for future references. Engineering design will be based on specified probability storm and the runoff generated by catchments
In the hydrographs of Cynon River, there was an almost steady flow of water in the river for the first 40 hours. As the height of water start to rise on the 42nd hour, water had a abrupt rise and on the 44th hour the water temporarily had a constant flow and began rising again on the 48th hour. The rise was constantly rising until it reached the peak flow and it was recorded to be 0.65m above the river bed and the rainfall recorded at 1.2mm. In the analyses of the river hydrograph, the rise of water is faster than when it starts to subside. It would take more time to subside, and having a steady downward motion. There are factors that control the shape of hydrographs. The typical shape are shown and the main components are labeled according to Weyman (1975). A hydrograph would show the difference between the peak rainfall from the peak discharge. This is known as the lag time. ...
Download paper


The study of storm events in rivers are used to gather information. Actual rainfall data and data from flow gauging stations are made available for the recording of actual flooding events. Data gathered are often sparse, however theoretical calculations of a runoff into the rivers are usually limited in accuracy…
Author : mayerreyes

Related Essays

Storm Drainage Design Project, Hydrographs
Rainfall is the input used to a watershed and the stream flow is also considered as the output of the watershed. A hydrograph also represents how a watershed reacts to rainfall. King1998, in his report said that the response of a watershed to rainfall depends on several factors which affects the shape of a hydrograph. This represents the effect of rainfall on a particular basin. This is a hypothetical response of a watershed to the input of rainfall. This will allow calculations of the response to any input(rainfall). Hydrographs are often affected by factors of soil saturation and the...
9 pages (2259 words) Essay
Storm Drainage Design Project Study
As we go along this course work ,we will be able to understand what hydrographs are.
8 pages (2008 words) Essay
Storm Drainage Design
The ground water flow component is the sub-surface runoff component contributing to the river discharge from a particular region after the rainfall. If the major portion of runoff water reaches the river as overland flow , a heavy rainfall would result in quick response in the river and the hydrograph shape would be peak. Thus the risk of floods would be higher in this case. While if the major share is through ground water flow the rise in discharge is slower and the repose of the river is slower. Thus the rate at which the flood waters reaches the river body determines the shape of t he...
11 pages (2761 words) Assignment
Storm Drainage Design Project - Scientific methods
To understand more on the subject at hand, we first define what is a storm and a hydrograph. According to Wikipedia, a storm is any disturbed state of an astronomical body's atmosphere, especially affecting its surface, and strongly implying severe weather. It may be marked by strong wind, thunder and lightning (a thunderstorm), heavy precipitation, such as ice or wind transporting some substance through the atmosphere.1 Meanwhile a hydrograph is defined as "a representation of flow for a particular stream and is used to evaluate the watershed runoff volumes and the peak flow rates from a...
6 pages (1506 words) Assignment
Storm Drainage Design Project, Flood Hydrographs
In addition hydrograph also carries information of base flow, which is the initial flow condition of the river existing in river prior to any storm. The base lag refers to the time repose of the river with respect to a rainfall which signifies the drainage potential of the catchments. The time interval between the peak rainfall the time of occurrence of peak discharge is reported as the basin lag. The rivers with short basin lag are more prone to floods as the respond very quickly to rainfall and hence the discharge in the river increases tremendously sooner the catchment receives a rainfall....
8 pages (2008 words) Essay
Storm Drainage Study
A line graph is usually used for the discharge over time. Rainfall is plotted with the use of a bar graph. There are several factors that control the shape of a hydrograph. The different shapes are shown and the main components are labelled according to Weyman, 1975. Hydrographs have differences between the peak rainfall from its peak discharge. The difference is the lag time. If the lag time is great, there is a less chance of flooding. A short lag time will indicate that water had already reached the river channel at a fast rate. The rise in discharge shown in the is called the rising limb,...
6 pages (1506 words) Essay
storm drainage design project
Hydrograph analysis is also used to explain various river behaviors such as how a watershed responds to rainfall and how lag time is related with other parameters such as soil conditions and geology. It also helps in finding out discharge patterns of a particular drainage basin and helps engineers and planners to assess the potential of a river to flood and predict flooding events, therefore influence implementation of various flood prevention measures by means of water supply pipelines or channels, dams etc.
6 pages (1506 words) Essay
Got a tricky question? Receive an answer from students like you! Try us!