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ENGINEERING HYDROLOGY - Assignment Example

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ENGINEERING HYDROLOGY

Imagine that you are a consultant preparing this for a committee within the Environment Agency, for the purposes of reviewing the hydrology of the catchments to (i) develop an understanding of the water resources of the catchments (with a view to considering the feasibility of constructing impoundments to create more storage) and (ii) evaluate flood risks. The investigation is of a very preliminary nature and is not intended as a pre-feasibility study, but rather just an intelligent use of existing data and desktop techniques.
a. First go to the National River Flow Archive and locate the Thrushel at Tinhay station (047008). Print out the station and catchment details and save the pdf of the long term hydrograph for this station and save the 'Long-term data file' as a csv (comma separated value format) file. Repeat this step for the Wallington at North Fareham (042001).
b. Now read through the station and catchment details for both, noting the location of the stations and their respective catchment areas and record lengths. Visually compare the two long term hydrographs; look carefully at the scale of their axes and hydrograph shapes. By reading through the catchment descriptions and your knowledge of the UK climate you should already be able to think of reasons why they are so different, despite having the same catchment area of about 112km2.
You can undertake a s...
Repeat this step for the Wallington at North Fareham (042001).

b. Now read through the station and catchment details for both, noting the location of the stations and their respective catchment areas and record lengths. Visually compare the two long term hydrographs; look carefully at the scale of their axes and hydrograph shapes. By reading through the catchment descriptions and your knowledge of the UK climate you should already be able to think of reasons why they are so different, despite having the same catchment area of about 112km2.

c. You may need you use the Pivot Table feature in Excel to summarise your monthly statistics
For the flood frequency analysis, you will need to obtain the annual maximum series (AMS) for these two stations from the HiFlows website:
http://www.environment-agency.gov.uk/hiflowsuk/

You can undertake a station search and obtain the AMS data from the menu on the left hand side. You need the date column and the discharge - do not use the ranking assigned in this dataset as it is in the opposite order to that required by Davie (2003)

Analysis
As a minimum your analysis should include:
Frequency histograms of flow
Bar charts of monthly flow characteristics
Flow duration curves (plotted on the same set of axes)
Comparative estimates of Q95, Q75, Q50, Q25 and Q10
Estimate the 1:2, 1:5, 1:10, 1:20, 1:30 floods using the Weibull and Gringorten formulae
Estimate the 1:60 flood using the Gumbel method of moments approach
You may also use any of the methods as outlined in the Flood Estimation Handbook (FEH)
Any other techniques that you might see as being appropriate
You need to critically evaluate your findings and provide recommendations for ...Show more

Summary

In this practical you are to (i) analyse, compare and contrast recorded flow data from two catchments and (ii) use a range of other techniques to characterise the flood hydrology for a range of design specifications. One catchment is located in Cornwall in the west and the other is in the south to the east of Southampton…
Author : klingcorene
ENGINEERING HYDROLOGY Assignment essay example
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