Hydrosphere

Question 1

what factors affect lag time

Answer 1

-rock type
-soil
-precipitation and temp
-land use
-drainage density
-area, shape and slope
-tidal conditions

Question 2

how does tidal conditions affect lag time

Answer 2

large tidal range = short lag time

Question 3

how does rock type affect lag time

Answer 3

impermeable = short lag e.g. granite
permeable = long lag e.g. limestone

Question 4

how does soil affect lag time

Answer 4

thick = long lag
thin = short lag
brown = long lag
gley = short lag

Question 5

how does precipitation and temp affect lag time

Answer 5

hot temp = high evaporation = long lag
very cold = snow + ice csn store = long lag
if snow melts quickly = short lag

Question 6

how does land use affect lag time

Answer 6

natural = long lag
rural = bare fields = short lag
urban = drains = long lag

Question 7

how does drainage densiity affect lag time

Answer 7

lots of streams in small area = short lag

Question 8

how does area, shape and slope affect lag time

Answer 8

steep slope = short lag
flat slope = long lag

Question 9

what physical factors need to be considered for a drainage basin

Answer 9

-narrow and deep valleys means lower cost for construction material
-If the site has impermeable rock, then it would reduce water loss from the reservoir by percolation
-High drainage density
-High rainfall
-low temperatures