Daily rainfall and temperature for Accra, Ghana (1981 to present)

A long-term daily weather record for Accra, on which the manual's lumped pipeline is built. It is real observed-and-reanalysis data retrieved from the NASA POWER service with sebkc::weather() for the Odaw basin (latitude 5.60 N, longitude 0.20 W), then reduced to the columns floodflow consumes. It is bundled with the package so the examples and manual keep working even if the online service is unavailable; drop it straight onto a flood_project as the rainfall slot. See the manual for how to fetch an equivalent record for your own location.

Usage

accra_rainfall

Format

A data frame with 16637 rows and 3 variables:

date

Date. Calendar day, YYYY-mm-dd.

precip_mm

numeric. Daily precipitation in millimetres (NASA POWER PRECTOTCORR).

temp_c

numeric. Daily mean air temperature in degrees Celsius (NASA POWER T2M); used by the Oudin potential-evapotranspiration step inside flood_runoff.

Source

NASA POWER daily point data, https://power.larc.nasa.gov, for latitude 5.60, longitude -0.20, retrieved with sebkc::weather().

Value

A data frame of 16637 daily records (1981-01-01 to 2026-07-20) with three columns: date (Date), precip_mm (numeric, mm) and temp_c (numeric, degrees C). It is the default worked-example rainfall record used throughout the floodflow manual.

Examples

fp <- flood_project("Odaw basin, Accra")
fp$rainfall <- accra_rainfall
fp <- flood_extremes(fp)
fp$extremes
#> <flood_extremes>
#>   years of record: 46
#>   GEV (stationary): mu=30.47 sigma=9.18 shape=0.252
#>   location trend (mm/yr): 0.0427
#>   trend test: LR=0.13 p=0.72  (no significant trend)
#>   return levels (mm):
#>        2-yr: 34.0
#>       10-yr: 58.3
#>       25-yr: 75.6
#>       50-yr: 91.4
#>      100-yr: 110.1