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To what extent is the River Roding a flooding threat to the area in which it flows?

Extracts from this document...

Introduction

Year 11 Geography Coursework To what extent is the River Roding a flooding threat to the area in which it flows? Introduction Aim: in this piece of coursework, my aim is to investigate the extent to which the River Roding is a flooding threat to the area in which it flows. Instead of studying it in books and on the internet, we visited the river so we could study what we have only previously studied in books. Timing of Fieldwork: We went to the River Roding to do our fieldwork on Tuesday October 4th 2005, in the autumn/winter season. We took the measurements between 10.00 am and 01.00 pm. On that day the weather was clear. Tuesday 4th October 2005 had a minimum temperature of 9�C and a maximum of 14 �C. There was no rainfall that day. Background of River Roding: The River Roding is a tributary of the River Thames situated in South-west Essex and east London. The river's source is at Molehill Green, east of Stanstead Airport and flows south to Ongar where it is joined by tributaries. From here it flows further south joined by more tributaries through Woodford and Wanstead down to the River Thames at Barking Creek. It is approximately 67 km long from its Source to its confluence at Barking. The River Roding was originally used for barge traffic until the mid 20th Century and reputedly had the largest fishing fleet in the world. It is now used for many other things such as boating and canoeing. Also there is evidence of settlement and burial around the Roding which dates back over 40,000 years to the Palaeolithic period. Refer to the location maps below. The River Roding has a catchment area of 342 km� in west Essex, which has an average annual rainfall of 605 mm. The river has a mean flow of 1.59 m3s-1 and it has an average channel width of 7.5 m. ...read more.

Middle

This enables us to see what damage would be done if the flood plain was to flood. * For observing Evidence of flooding, I looked for tide marks on bridges or debris left on the river bank from previous floods. This would let us see how many floods, and how high previous floods have been. * For observing evidence of management, I looked for obvious things like spillways and weirs, then I looked for things like concrete mattresses and banks. I also looked to see how high residential areas or roads were compared to the river, this would determine whether there was soft management. This enabled us to assess whether the council is doing enough with flood defence and to see if they are working adequately. Here is a photo of the measurement of infiltration. Technique Advantages Disadvantages Velocity It is quick and easy to measure the velocity this way. We didn't have to use a speedometer which can be hard to use. It was difficult to put the dog biscuit in at exactly 0 m and stop the watch at exactly 10 m. Infiltration It is quick to measure it this way. It only takes two people to measure this way. You do not need to use any special measurements by using a stopwatch. It was hard to read the measurements sometimes, and it was difficult to put the cylindrical flask in the ground at exactly 0 mm. River Cross-section We did not have to get in the water, which meant less chance of catching an illness. No special equipment was needed which was difficult to use. Sometimes we lost grip of the string and lost our measure. The weight came off the string. If there was debris or stones on the river bed, we could not always touch the river bed. Land-use Only took a few seconds, not a lot of time. ...read more.

Conclusion

The presentation met a disappointed response from residents and councilors annoyed that they had been denied the opportunity of a formal public meeting. Bridge ward councilor Morris Hickey said: "They had the temerity to refer to the exercise as a consultation. It's taken five years for them to produce this; well, the gestation period of an elephant is only two years and at least they produce something at the end of it. "It was all very cleverly done. In previous meetings the EA was under constant fire from all directions but often the vociferous few articulate the thoughts of the silent majority." The EA emphasises that the risk of flooding cannot be eliminated but that it plans to reduce the annual likelihood of properties being flooded from one in 50 to one in 100. Margaret Smith of Glastonbury Avenue said: "It was very pleasant when we were there but when we came away I thought, what have we achieved? My feeling was, nothing. I can't see how telling us what we already know does us any good." Feedback from the meeting will be taken into account when the EA publishes its much-delayed flood risk management strategy, currently due at the end of 2006. Cllr Hickey said: "It told us very little that we didn't already know and I'm angry about the waste of time and the waste of money. Residents should make their views known to the EA as if there is no tomorrow." Agency spokeswoman Emma Cassidy said they had received a lot of positive feedback from the meeting and emphasised that the river studies took time. She said: "We understand people's frustrations, but we have to look at the River Roding from start to finish, and that does take some time. "It's a hard message to tell people, but we're doing all we can and we feel we are in a good position to get the ball rolling. "The studies are all nearly finished." 3:00pm Saturday 24th September 2005 ...read more.

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