The indicator calculates the runoff prevention considering a rain event, the infiltration capacity and the rain harvesting and storage capacity. government.
Usage
runoff_prev(
x,
runoff_df = NULL,
rain = 85,
floors_field = "floors",
harvest_dist = 10,
tank_size = c(0, 45)
)Arguments
- x
An 'sf' object with the urban model of your city and a 'land_use' column with categories of urban features.
- runoff_df
A dataframe of categories that are considered impervious area with three columns.
'land_uses' with the names of 'land_use' in 'x' to be considered as impervious.
Curve numbers columns 'CN1' and 'CN2' the range of curve number of that function.
'water_storage', a boolean column indicating whether the land_uses is potentially harvesting and storing rainwater using a tank.
If NULL, categories and values of 'city_land_uses' are considered.
- rain
The amount of 24h-rain to be simulated, default is 85 mm.
- floors_field
The column in 'x' containing the number of floors of each building. Zero is considered unbuilt areas like gardens or streets. It is used to calculate rainwater harvesting area, since only upper surface are considered. Missing values are considered as zero.
- harvest_dist
Maximum distance (in meters) of buildings where to harvest rainwater
- tank_size
A two-length vector with the range of tank size possibilities, proportional to the surface of each element where the tank size is located (in l/m2).
Value
It returns a named vector with values of runoff in mm, total rainfall and harvested rainwater in cubic meters.
Examples
# Get the total values of runoff, rainfall and rain harvested
runoff_prev(city_example)
#> runoff rainfall rainharvest
#> 35.87703 108169.04500 1170.77182
# Adjust the parameters for rain, maximum distance to harvest rainwater and tank size
runoff_prev(city_example, rain = 160, harvest_dist = 5, tank_size = c(20,30))
#> runoff rainfall rainharvest
#> 100.4092 203612.3200 1380.2859