get_roof_runoff: Estimate the amount of rain flown into a tank collected on an...
In mbask/pluviometer: Precipitation Readings From a Home-made Pluviometer
Description
Usage
Arguments
Value
Examples
Description
Rain tanks typically collect water from house roofs. The amount of roof runoff is very simple:
$(precipitation * precipitation_area * discharge_coef) - first_flush_diverted$
The discharge coefficient determines the proportion of rainfall to the total rainfall,
that is actually discharged from the roof. An inclined hard roof, with shingles, assume
a discharge coefficient of 80
of about 30
First flush devices are designed to siphon off the first rainwater that falls on the roof.
If suc a device is fitted to the rain pipes, the volume of water diverted will have
to be subtracted from the roof runoff volume.
Usage
1
2
get_roof_runoff(precipitation, precipitation_area, discharge_coef = 0.8,
first_flush_diverted = 0)
Arguments
precipitation
the amount of rain fallen in mm (that is l/m2)
precipitation_area
the surface area of the roof (in m2)
discharge_coef
the discharge coefficient (optional, defaults to 0.8)
first_flush_diverted
the amount of water diverted by "first flush devices" (in l, optional, default to 0, i.e. no first flush device installed).
Value
volume of water runoff (numeric, in l)
Examples
1
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5
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# Amount of roof runoff following a 10 mm rain on a 150 m2 roof
get_roof_runoff(10, 150)
# Amount of roof runoff following a 10 mm rain on a 150 m2 green roof,
get_roof_runoff(10, 150, 0.3)
# Amount of roof runoff following a 10 mm rain on a 150 m2 green roof,
# where a first flush device that diverts 50 litres is fitted,
get_roof_runoff(10, 150, 0.3, 50)
mbask/pluviometer documentation built on May 21, 2019, 2:25 p.m.
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Description Usage Arguments Value Examples
Description
Rain tanks typically collect water from house roofs. The amount of roof runoff is very simple: $(precipitation * precipitation_area * discharge_coef) - first_flush_diverted$ The discharge coefficient determines the proportion of rainfall to the total rainfall, that is actually discharged from the roof. An inclined hard roof, with shingles, assume a discharge coefficient of 80 of about 30 First flush devices are designed to siphon off the first rainwater that falls on the roof. If suc a device is fitted to the rain pipes, the volume of water diverted will have to be subtracted from the roof runoff volume.
Usage
1 2 | get_roof_runoff(precipitation, precipitation_area, discharge_coef = 0.8,
first_flush_diverted = 0)
|
Arguments
precipitation |
the amount of rain fallen in mm (that is l/m2) |
precipitation_area |
the surface area of the roof (in m2) |
discharge_coef |
the discharge coefficient (optional, defaults to 0.8) |
first_flush_diverted |
the amount of water diverted by "first flush devices" (in l, optional, default to 0, i.e. no first flush device installed). |
Value
volume of water runoff (numeric, in l)
Examples
1 2 3 4 5 6 7 | # Amount of roof runoff following a 10 mm rain on a 150 m2 roof
get_roof_runoff(10, 150)
# Amount of roof runoff following a 10 mm rain on a 150 m2 green roof,
get_roof_runoff(10, 150, 0.3)
# Amount of roof runoff following a 10 mm rain on a 150 m2 green roof,
# where a first flush device that diverts 50 litres is fitted,
get_roof_runoff(10, 150, 0.3, 50)
|
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