• 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)

    Q: "Human activity, climate and landscape all affect a rivers regime" Discuss with reference to rivers from around the world. Suggested Answer The river regime is the expected seasonal pattern of discharge at a given point, over a year. The discharge is the amount of water flowing in the river channel.

  2. Variations in River Discharge

    Sub tropical hot deserts - annual rainfall is less than 250 mm. There are high rates of evapotranspiration, resulting in minimal river discharge.

  1. Case Study: The Mississippi River Flood of 1993

    * Individual storms frequently dumped large volumes of precipitation that could not be accommodated by local streams. The map at the bottom shows rainfall in Iowa over a two-day period. Over six inches of rain fell in parts of southern Iowa; * The ground was saturated because of cooler than normal conditions during the previous year (less evaporation)

  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. Edexcel Geography B Unit 3 Coursework

    There is a significant relationship between average depth and velocity downstream in the River Holford. 6. There is a connection between depth and hydraulic radius downstream in the River Holford. Methodology When collecting data across the River Holford's course it was not possible to collect data on all the ranges of variables (because of time and money restraints)

  2. Investigating the river Caerfanell

    downstream * As channel size increases, velocity will increase * As gradient increases, velocity will increase * Gradient will have no affect channel shape or roughness METHODOLOGY The three sites we choose from this river to assemble and gather results from are...

  1. 'To what extent does the River Lyn conform to the Bradshaw model of River ...

    There was a difficulty in trying the keep the tape steady due to the flow of the River and the wind. 11/11/02 7, A, B, C Wetted perimeter String To help to see if the River Lyn conforms to the Bradshaw model Measured with string and following the Riverbed, then the string was measured.

  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