Hydrographs are important part of the study of storm drainage. Hydrographs are graphs which represents the relation of the height and discharge of water in rivers over a certain period of time. Measurements are done in certain points in the river to determine how a watershed reacts to rainfall…
Dry weather or dry season, normally creates a crust on river beds and wet winters would increase the discharge. The results of hydrograph readings would determine the design of a storm drainage
In analyzing the graphs above, we could say that the height of rise of water in the river was faster that when the water subsided. A sudden rise of water in rivers occurs after a rainstorm. This is the time when there is accumulation of water in the river. Another incidence of a sudden rise of water in rivers is when there is a down pour of rain upstream. It may not fall on the exact location of the rise in water height, it could come from the accumulation of water somewhere in the upstream of the river.
In the study done in Cynon river, there was a steady flow of water on the first 42 hours. At the start of the 43rd hour, water began to rise. The rise of water in a hydrograph is called the rising limb. The water reached its peak flow at its52nd hour. The time of the peak flow is known to be the basin lag time. As the water starts to fall down, the term given to the falling down of the height of water is recession limb. After the falling down of water discharge, the water height starts to normalize. The storm flow is called the total of the overland flow, and the through flow. The overland flow, is the flow at which the water rises above the through flow and the through is termed as the water that rises above the base flow.
In the computations of the design of the open channel and the river, or the water source for a reservoir. or a water impounding area, there are factors or conditions to be taken into account. First, we must set conditions for the design criteria. Next, the elevation where the pump is to be placed or would it be feasible to have the pump in that certain location. If a pump is needed, how much force will the pump require in order to draw water from a river to a location higher that the river elevation.
Computations of the Channel design
With the given data below, it is required that we get the value of breadth b of an open channel using the Manning's Formula. After we achieve the value for the depth, it is also stated that we solve for the value of the width of the river where in, the river is the proposed water source of a nearby reservoir
Q = 1.0 m3/s
n = 0.020
S = 1/3000 = 0.0003
d = 0.5
Formula to be used
V = where: v = velocity
Q = Av R = Hydraulic Radius
Q = A S = slope
A = bd n = Manning's coefficient
R = Q = discharge
Solutions to the required unknown
A = db
Q = A
1.0 = 0.5b
1.0(0.020) = 0.5b
0.0200 = 0.5b
1.1695 = 0.5
(2.339)3 = b3
12.7964(1.0 + 2b + b2) = 0.25b5
12.7964 + 25.5928b + 12.7964b2 = 0.25b5
12.7964 + 25.5 ...
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(Storm Drainage Design Project Master Essay Example | Topics and Well Written Essays - 2000 Words)
“Storm Drainage Design Project Master Essay Example | Topics and Well Written Essays - 2000 Words”, n.d. https://studentshare.net/technology/282970-storm-drainage-design-project-master-essay.
A hydrograph plots the river discharge and amount of rainfall as a function of time.
In the study of storm drainage, the analysis of hydrographs are important. A hydrograph plots the river discharge as a function of time. Measurements are done at a certain point in a river.
There are factors that control the shapes of a hydrograph. According to Weyman, 1975 there are different shapes that are shown and the main components are labeled. The components of a hydrographs are the rising limb, the falling limb ,the peak discharge and the lag time.
A hydrograph also represents how a watershed reacts to rainfall. 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.
Various components of a hydrograph consist of a rising limb which represents the initial portion of a hydrograph, the peak discharge which related to the maximum discharge estimated and the receding limb , which relates to the decreasing part of the discharge with time.
Hydrographs are records for the study of storm drainage. It is a graph of the flow in a stream over a period of time. Peaks in a hydrographs are usually the results of precipitation events while troughs represent It is graph of the flow in a stream over a period of time The peaks in the hydrograph are results of precipitation events while troughs represent dry seasons.
nt area, river flow measurements, base flow and lag times is gathered through various sources such as satellite imagery and a network of stream gauges.
Hydrograph analysis involves the study of runoff records at a stream gauge, river discharge after a rain and drainage rate of
ainfall is quantified as lag time which shows the time difference between the peak rainfall and the peak discharge in the river corresponding to that rainfall. Thus the rivers that have relatively short lag time respond very quickly to rainfall and hence can be considered as
The hydrograph presented in Figure 3 shows the rainfall data observed for the River Cynon catchment in the form of vertical bar graphs and river height data in a line graph. Rainfall and river height were plotted along the
Observations considered were from midnight (00:00:00 hour) of October 12, 1998 until 11:00 pm (23:00:00 hours) of October 15, 1998. Due to space constraint, observation intervals were shown every four hours, but the data used hourly observations in the
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