SUBROUTINE evappot(klon, nbsrf, ftsol, pplay, cdragh, &
        t_seri, q_seri, u_seri, v_seri, evap_pot)
  USE lmdz_yoethf

  USE lmdz_yomcst

  IMPLICIT NONE
 INCLUDE "FCTTRE.h"

  INTEGER :: klon, nbsrf
  REAL, DIMENSION(klon, nbsrf) :: ftsol, evap_pot
  REAL, DIMENSION(klon) :: pplay, t_seri, wind, q_seri, u_seri, v_seri, cdragh

  INTEGER :: nsrf, i
  REAL, DIMENSION(klon, nbsrf) :: qsat_ftsol
  REAL, DIMENSION(klon) :: rhos, norme_u
  REAL :: t_coup

  t_coup = 234.   ! Quelle horreur !!!!!

  DO nsrf = 1, nbsrf
    DO i = 1, klon
      IF (ftsol(i, nsrf)<t_coup) THEN
        qsat_ftsol(i, nsrf) = qsats(ftsol(i, nsrf)) / pplay(i)
      ELSE
        qsat_ftsol(i, nsrf) = qsatl(ftsol(i, nsrf)) / pplay(i)
      ENDIF
    ENDDO
  ENDDO
  ! ========================================================== c
  ! Calcul de l'evaporation Potentielle

  rhos(:) = pplay(:) / (RD * t_seri(:))
  norme_u(:) = 1. + sqrt(u_seri(:) * u_seri(:) + v_seri(:) * v_seri(:))
  DO nsrf = 1, nbsrf
    evap_pot(:, nsrf) = rhos(:) * cdragh(:) * norme_u(:) * (qsat_ftsol(:, nsrf) - q_seri(:))
  ENDDO
  RETURN

END