1. Need help? Please let us know in the UMEP Community.

  2. Please report issues with the manual on the GitHub Issues.

  3. Please cite SUEWS with proper information from our Zenodo page.

6.3. Differences between SUEWS and LUMPS#

The largest difference between LUMPS and SUEWS is that the latter simulates the urban water balance in detail while LUMPS takes a simpler approach for the sensible and latent heat fluxes and the water balance (“water bucket”). The calculation of evaporation/latent heat in SUEWS is more biophysically based. Due to its simplicity, LUMPS requires less parameters in order to run. SUEWS gives turbulent heat fluxes calculated with both models as an output.

Similarities and differences between LUMPS and SUEWS.



Net all-wave radiation (Q*)

Input or NARP

Input or NARP

Storage heat flux (ΔQS)

Input or from OHM

Input or from OHM

Anthropogenic heat flux (QF)

Input or calculated

Input or calculated

Latent heat (QE)

DeBruin and Holtslag (1982)

Penman-Monteith equation2

Sensible heat flux (QH)

DeBruin and Holtslag (1982)

Residual from available energy minus QE

Water balance

No water balance included

Running water balance of canopy and water balance of soil

Soil moisture

Not considered


Surface wetness

Simple water bucket model

Running water balance


Only fraction of surface area that is irrigated

Input or calculated with a simple model

Surface cover

Buildings, paved, vegetation

Buildings, paved, coniferous and deciduous trees/shrubs, irrigated and unirrigated grass

6.4. Differences between SUEWS and FRAISE#

FRAISE, Flux Ratio – Active Index Surface Exchange scheme, provides an estimate of mean midday (±3 h around solar noon) energy partitioning from information on the surface characteristics and estimates of the mean midday incoming radiative energy and anthropogenic heat release. Please refer to Loridan and Grimmond [2012] for further details.








More complex

Software provided

R code

Windows exe (written in Fortran)

Windows exe (written in Fortran) - other versions available

Applicable period

Midday (within 3 h of solar noon) Calculates active surface


5 min-hourly-annu al

Unique features

Calculates active surface and fluxes

Radiation and energy balances

Radiation, energy and water balance (includes LUMPS)