river harborne

Question 1

compare the frequency of flooding after sustainable river management- case study

Answer 1

used to be once in every 3 years to currently once in every 40 years

Question 2

name 2 physical factors that lead to flooding- case study

Answer 2

increase frequency in the number of intense rainfall events, river starts at 350mm above sea level on the impermeable granite bedrock of Dartmoor, Dartmoor received 2020mm of rainfall annually which is twice as much as lower surrounding coastal areas, from the size of the catchment the river has a high drainage density

Question 3

give 2 human factors that increased the chance of flooding- case study

Answer 3

many properties are built on low lying floodplain, the A381 road has been widened over the years to cope with traffic which increased the surface runoff into the river

Question 4

how has the river been managed- case study

Answer 4

the use of soft and hard engineering has been used but locals aim to use nature and local resources to protect the river, sea trout and brown fish are a protected species, the scheme has 2 main features which are an upstream flood storage reservoir and a flood defense through the village

Question 5

what has been done to manage the villages- name 2- case study

Answer 5

bed lowering to keep the aesthetic quality of the central village and increase the rivers capacity, channelization throughout lower sections of the village to protect the residential areas, the river is now twice as large and the bend in the river has been reinforced to reduce erosion, storm drains have been added to reduce the impact of a flood

Question 6

what does flood hazard mapping do- case study

Answer 6

flood maps help us to understand and manage flood risks by identifying where will flood, hydraulic modeling calculates water levels along rivers which we then use to map floods through our communities and use historical data