diff --git a/source/src/sfincs_data.f90 b/source/src/sfincs_data.f90
index 22de7978..45b7917b 100644
--- a/source/src/sfincs_data.f90
+++ b/source/src/sfincs_data.f90
@@ -151,7 +151,8 @@ module sfincs_data
       character*256 :: sbgfile
       character*256 :: thdfile
       character*256 :: weirfile
-      character*256 :: qinffile
+      character*256 :: qinffile
+      character*256 :: runofffile
       character*256 :: netbndbzsbzifile
       character*256 :: netsrcdisfile
       character*256 :: netamuamvfile
diff --git a/source/src/sfincs_domain.f90 b/source/src/sfincs_domain.f90
index 67f7ed6a..e4893f2e 100644
--- a/source/src/sfincs_domain.f90
+++ b/source/src/sfincs_domain.f90
@@ -1993,7 +1993,7 @@ subroutine initialize_infiltration()
    ! 1) Spatially-uniform constant infiltration
    !    Requires: -
    ! 2) Spatially-varying constant infiltration
-   !    Requires: qinfmap (does not require qinffield !)
+   !    Requires: qinfmap (does not require qinffield !)
    ! 3) Spatially-varying infiltration with CN numbers (old)
    !    Requires: cumprcp, cuminf, qinfmap, qinffield
    ! 4) Spatially-varying infiltration with CN numbers (new)
@@ -2024,6 +2024,13 @@ subroutine initialize_infiltration()
          inftype = 'c2d'
          infiltration = .true.      
          !
+      elseif (runofffile /= 'none') then
+         !
+         ! Spatially-varying constant run off
+         !
+         inftype = 'r2d'
+         infiltration = .true.      
+         !
       elseif (scsfile /= 'none') then
          !
          ! Spatially-varying infiltration with CN numbers (old)
@@ -2115,6 +2122,22 @@ subroutine initialize_infiltration()
          do nm = 1, np
             qinffield(nm) = qinffield(nm)/3.6e3/1.0e3   ! convert to +m/s
          enddo
+         !            
+      elseif (inftype == 'r2d') then
+         !
+         ! Spatially-varying constant runoff
+         !
+         write(logstr,'(a)')'Info    : turning on spatially-varying constant run-off'      
+         call write_log(logstr, 0)
+         !
+         ! Read spatially-varying runoff (only binary, specified in %)
+         !
+         write(logstr,'(a,a)')'Info    : reading infiltration file ', trim(runofffile)
+         call write_log(logstr, 0)		 
+         allocate(qinffield(np))
+         open(unit = 500, file = trim(runofffile), form = 'unformatted', access = 'stream')
+         read(500)qinffield
+         close(500)
          !
       elseif (inftype == 'cna') then
          !
diff --git a/source/src/sfincs_infiltration.f90 b/source/src/sfincs_infiltration.f90
index 76897f2d..8301fed4 100644
--- a/source/src/sfincs_infiltration.f90
+++ b/source/src/sfincs_infiltration.f90
@@ -47,6 +47,36 @@ subroutine update_infiltration_map(dt)
       !$omp end do
       !$omp end parallel
       !
+   elseif (inftype == 'r2d') then
+      !
+      ! Run-off coefficient map
+      !
+      !$omp parallel &
+      !$omp private ( nm )
+      !$omp do
+      do nm = 1, np
+         !
+         qinfmap(nm) = qinffield(nm)
+         !
+         ! No infiltration if there is no water
+         !  
+         if (subgrid) then
+            if (z_volume(nm)<=0.0) then
+               qinfmap(nm) = 100.0
+            endif
+         else
+            if (zs(nm)<=zb(nm)) then
+               qinfmap(nm) = 100.0
+            endif
+         endif
+         !
+         cuminf(nm) = cuminf(nm) + (1.0-qinfmap(nm)/100.0)*netprcp(nm)*dt
+         netprcp(nm) = netprcp(nm) - (1.0-qinfmap(nm)/100.0)*netprcp(nm)
+         !
+      enddo
+      !$omp end do
+      !$omp end parallel
+      !	    
    elseif (inftype == 'cna') then
       !
       ! Determine infiltration rate with Curve Number (old method; no recovery)
diff --git a/source/src/sfincs_input.f90 b/source/src/sfincs_input.f90
index 01c3921a..388d1a43 100644
--- a/source/src/sfincs_input.f90
+++ b/source/src/sfincs_input.f90
@@ -182,6 +182,7 @@ subroutine read_sfincs_input()
    call read_char_input(500,'z0lfile',z0lfile,'none')
    call read_char_input(500,'wvmfile',wvmfile,'none')
    call read_char_input(500,'qinffile',qinffile,'none')
+   call read_char_input(500,'runofffile',runofffile,'none')
    ! Curve Number files
    call read_char_input(500,'scsfile',scsfile,'none')           
    call read_char_input(500,'smaxfile',smaxfile,'none')
diff --git a/source/src/sfincs_ncoutput.F90 b/source/src/sfincs_ncoutput.F90
index a2af3431..a72542ad 100644
--- a/source/src/sfincs_ncoutput.F90
+++ b/source/src/sfincs_ncoutput.F90
@@ -1236,8 +1236,12 @@ subroutine ncoutput_quadtree_map_init()
    if (infiltration) then
        NF90(nf90_def_var(map_file%ncid, 'qinf', NF90_FLOAT, (/map_file%nmesh2d_face_dimid/), map_file%qinf_varid))
        NF90(nf90_def_var_deflate(map_file%ncid, map_file%qinf_varid, 1, 1, nc_deflate_level))
-       NF90(nf90_put_att(map_file%ncid, map_file%qinf_varid, '_FillValue', FILL_VALUE))     
-       if (inftype == 'cna') then
+       NF90(nf90_put_att(map_file%ncid, map_file%qinf_varid, '_FillValue', FILL_VALUE))     
+       if (inftype == 'r2d') then
+           NF90(nf90_put_att(map_file%ncid, map_file%qinf_varid, 'standard_name', 'runoff')) 
+           NF90(nf90_put_att(map_file%ncid, map_file%qinf_varid, 'long_name', 'Run-off - constant in time')) 
+           NF90(nf90_put_att(map_file%ncid, map_file%qinf_varid, 'units', '%'))
+       elseif (inftype == 'cna') then
            NF90(nf90_put_att(map_file%ncid, map_file%qinf_varid, 'standard_name', 'S')) 
            NF90(nf90_put_att(map_file%ncid, map_file%qinf_varid, 'long_name', 'moisture storage (S) capacity - Curve number')) 
            NF90(nf90_put_att(map_file%ncid, map_file%qinf_varid, 'units', 'm'))