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eCLM-ParFlow: Route impervious urban runoff into ParFlow #138

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eCLM-ParFlow: Route impervious urban runoff into ParFlow #138

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e9f5120
eCLM-ParFlow: Couple urban landunits
s-poll Sep 3, 2026
b2e76ba
eCLM-ParFlow: Route impervious urban runoff into ParFlow
s-poll Sep 3, 2026
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12 changes: 12 additions & 0 deletions src/clm5/biogeophys/SoilHydrologyMod.F90
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Expand Up @@ -2373,6 +2373,7 @@ subroutine ParFlowDrainage(bounds, num_hydrologyc, filter_hydrologyc, &
qflx_drain => waterflux_inst%qflx_drain_col , & ! sub-surface runoff (mm H2O /s)
qflx_drain_perched => waterflux_inst%qflx_drain_perched_col , & ! perched wt sub-surface runoff (mm H2O /s)
qflx_qrgwl => waterflux_inst%qflx_qrgwl_col , & ! qflx_surf at glaciers, wetlands, lakes (mm H2O /s)
qflx_surf => waterflux_inst%qflx_surf_col , & ! surface runoff (mm H2O /s)
qflx_rsub_sat => waterflux_inst%qflx_rsub_sat_col , & ! soil saturation excess [mm h2o/s]
qflx_infl => waterflux_inst%qflx_infl_col , & ! infiltration (mm H2O /s)
qflx_rootsoi => waterflux_inst%qflx_rootsoi_col , & ! vegetation/soil water exchange (mm H2O/s) (+ = to atm)
Expand Down Expand Up @@ -2409,6 +2410,17 @@ subroutine ParFlowDrainage(bounds, num_hydrologyc, filter_hydrologyc, &
qflx_drain(c) = 0._r8
! This must be done for roofs and impervious road (walls will be zero)
qflx_qrgwl(c) = qflx_snwcp_liq(c)

! Instead of leaving as river runoff, impervious urban runoff enters
! ParFlow through layer 1. It is zeroed here so it is not counted twice.
qflx_parflow(c,1:nlevsoi) = 0._r8
qflx_parflow(c,1) = qflx_surf(c) + qflx_qrgwl(c)
qflx_surf(c) = 0._r8
qflx_qrgwl(c) = 0._r8

qflx_drain(c) = -sum(qflx_parflow(c,:))

qflx_parflow(c,1:nlevsoi) = qflx_parflow(c,1:nlevsoi) * sec_per_hr * m_per_mm * (1._r8/dz(c,1:nlevsoi))
end if
end do
end associate
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15 changes: 8 additions & 7 deletions src/clm5/main/clm_driver.F90
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Expand Up @@ -1306,13 +1306,14 @@ subroutine clm_drv_init(bounds, &
end do

#ifdef COUP_OAS_PFL
! TSMP/bldsva/intf_oas3/clm3_5/mct/receive_fld_2pfl.F90
! COUP_OAS_PFL
do f = 1, num_soilc
c = filter_soilc(f)
g = col%gridcell(c)
pfl_psi(c,:) = atm2lnd_inst%pfl_psi_grc(g,:)
pfl_h2osoi_liq(c,:) = atm2lnd_inst%pfl_h2osoi_liq_grc(g,:)
! Cover every column that soilwater_parflow will later overwrite.
do f = 1, num_nolakec
c = filter_nolakec(f)
if (col%hydrologically_active(c)) then
g = col%gridcell(c)
pfl_psi(c,:) = atm2lnd_inst%pfl_psi_grc(g,:)
pfl_h2osoi_liq(c,:) = atm2lnd_inst%pfl_h2osoi_liq_grc(g,:)
end if
end do
#endif
end associate
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