• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Assess the costs and benefits of one river management scheme you have studied

Extracts from this document...

Introduction

Assess the costs and benefits of one river management scheme (15 Marks) There are various arguments for and against the management of the Mississippi and in particular the method of hard engineering used. The Mississippi drains approximately one third of the USA and is a major transport route therefore it is essential that the river is managed efficiently in order to protect jobs, businesses and homes. Although the management failed in 1993 the volume of water was not accounted for, the sporadic volume was not designed to be matched by the management. In effect the budget was set out to prevent specifically flood of a lower volume of water, it can be argued that up until the 1993 floods it was working perfectly. ...read more.

Middle

On the other hand, wing dykes in particular that were used had questionable efficiency. Although the method naturally eroded the bed to create a deeper channel, an excess deposition occurs near the bank. Whether the hydraulic radius is increased or not is questionable compared to the costly development of such a technique. Levees built across the Mississippi could simply not hold the large volume of water back, when the levees broke a great surge of water flooded nearby areas creating hazardous conditions and damaging houses. If there were no levees there would be in fact a slow seepage of water that would be more manageable and less likely to cause flooding due to the lack of energy. ...read more.

Conclusion

The dynamics of the Mississippi have also been upset by using hard engineering. By shortening it, it has been made steeper so it erodes and deposits downstream. Speed has increased and delta loses 35 square miles of swamp each year which has not only threatened the wildlife but also local jobs. In my opinion the flood management schemes are costly but essential. But for the management techniques used a lot more damage would have been created. It must been seen that the Mississippi needs to be controlled as there would be huge public opposition to simply "doing nothing". Finally the management employed was only designed to protect the local areas of a certain river discharge; they were not designed to prevent flooding of such magnitude in 1993 and therefore were not at fault for the damage generated. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Hydrology & Fluvial Geomorphology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a teacher thought of this essay

3 star(s)

This answer shows that the author knows something about the Mississippi river management scheme, although some elements should be explained further. It contains some relevant case study information, including financial details. However, it does not make direct reference to the key words in the question - costs and benefits - and as a result seems to be answering a different question. More attention to the question as set would make a big difference.

Marked by teacher Nigel Fisher 16/02/2012

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Hydrology & Fluvial Geomorphology essays

  1. Hydrology and Fluvial geomorphology. (Q&A)

    It is calculated by multiplying the cross-sectional area by the mean velocity (speed). A river's regime is based on average monthly discharge figures. These are collected over at least 20 years to try to eliminate minor year-to-year variations. There are several factors which will affect the river's regime, including rainfall, temperature, human use of the land and the landscape.

  2. Explain how human activity can modify the hydrological cycle.

    This helps farmers in times when there is little rainfall, and it is a direct and intentional affect on the hydrological cycle by humans. Water is taken from the water table for domestic human usage. This means that the water table drops, and so there is no base flow into rivers and rivers may dry out.

  1. How may knowledge of the hydrological cycle and its components assist in devising flood ...

    By studying the discharge patterns of the river in concern, and the flood events, the capacity and pattern of flooding can be worked out. This way, developments of settlements can be guided in a way 2 that avoids the areas more prone to flooding.

  2. Study the downstream changes of Loughton Brook.

    and open grasslands (one-third). The soil is mainly London clay but some areas have Claygate beds (clay with sand) and some areas have Bagshot beds (sand with clay). Pebbles found in and around the water show that they change in size and shape from large, angular pebbles to smaller, well-rounded, pebbles.

  1. An investigation into changes in channel parameters down the river Horner

    When measuring this I will need to keep tension on the tape otherwise it will go downstream as the water pushes on it. This would be inaccurate as it needs to be a straight measure from bank to bank. Wetted perimeter I am going to measure the wetted perimeter so that I can calculate the hydraulic radius.

  2. 'How does the risk of flooding vary along the course of the River Eea?'

    There were quite a lot of trees and vegetation so that would intercept the rain and the roots would absorb the moisture in the soil while keeping the soil together. The land was covered in vegetation, mainly ferns, which would usually increase the lag time after periods of rain.

  1. How does Loughton Brook change as it moves downstream?

    When we were collecting pebbles from the sites we chose to do it randomly. This will show that our hypothesis of the shapes of the pebbles being different would be easy to investigate, To calculate the velocity at each site we used a Systematic method.

  2. Examine how a glacier operates as a system (25)

    Ice which has been stored in the glacier can melt; usually in warmer, summer months, and flow out of the glacier as meltwater and leave the system. Evaporation is another significant output, snow from the surface of the glacier can melt and evaporate.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work