geography- river discharge and engineering for flooding prevention
- Created by: zhzstudent
- Created on: 08-02-14 16:41
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- Water on the land
- River Discharge
- hydrographs
- rising limb
- increase in river discharge
- falling limb
- decrease in river discharge-return normal level
- lag time
- delay between two peaks
- peak discharge
- highest river discharge
- peak rainfall
- largect volume of rainfall
- storm flow
- normal flow
- maximum river capacity
- over/above= flood
- discharge in cumecs
- rising limb
- factors
- rainfall
- lots, short, heavy
- more runoff
- decrease lag time
- increase river discharge
- lots, short, heavy
- temperature
- hot, dry
- hard ground
- increase r. discharge
- hard ground
- cold, freezing
- hard ground
- increase r. discharge
- hard ground
- hot, dry
- previous weather conditions
- lots of rain=
- saturated soil=
- can't infiltrate = increase r.discharge
- saturated soil=
- lots of rain=
- Rock type
- permeable rock- infiltrate through pore spaces
- pervious rock- flow along cracks
- permeable rock- infiltrate through pore spaces
- not much runoff- less r.discharge
- impermeable= increase r.dishchage
- factors
- rainfall
- lots, short, heavy
- more runoff
- decrease lag time
- increase river discharge
- lots, short, heavy
- temperature
- hot, dry
- cold, freezing
- hot, dry
- previous weather conditions
- lots of rain=
- saturated soil=
- can't infiltrate = increase r.discharge
- saturated soil=
- lots of rain=
- Rock type
- pervious rock- flow along cracks
- not much runoff- less r.discharge
- not much runoff- less r.discharge
- impermeable= increase r.dishchage
- pervious rock- flow along cracks
- land use
- urban area=
- drainage system
- increas r.discharge
- impermeable surface
- increas r.discharge
- impermeable surface
- drainage system
- urban area=
- relief
- steep= increase r.disharge
- increase runoof, decrease lag time, increase r.disharge
- rainfall
- factors
- land use
- urban area=
- drainage system
- increas r.discharge
- increas r.discharge
- drainage system
- urban area=
- relief
- steep= increase r.disharge
- increase runoof, decrease lag time, increase r.disharge
- rainfall
- hydrographs
- Enginerring reduce flooding
- soft engineering
- schemes set up- use knowledge of river and processes to reduce the effects of flooding
- examples
- flood warnings
- preparation
- flood plain zoing
- do nothing
- hard engineering
- man-made structures to control the flow of rivers and reduce flooding
- examples
- dams and resevoirs
- channel straightening
- soft engineering
- River Discharge
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