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

USE yomcst_mod_h, ONLY: RPI, RCLUM, RHPLA, RKBOL, RNAVO                   &
          , RDAY, REA, REPSM, RSIYEA, RSIDAY, ROMEGA                  &
          , R_ecc, R_peri, R_incl                                      &
          , RA, RG, R1SA                                         &
          , RSIGMA                                                     &
          , R, RMD, RMV, RD, RV, RCPD                    &
          , RMO3, RMCO2, RMC, RMCH4, RMN2O, RMCFC11, RMCFC12        &
          , RCPV, RCVD, RCVV, RKAPPA, RETV, eps_w                    &
          , RCW, RCS                                                 &
          , RLVTT, RLSTT, RLMLT, RTT, RATM                           &
          , RESTT, RALPW, RBETW, RGAMW, RALPS, RBETS, RGAMS            &
          , RALPD, RBETD, RGAMD
IMPLICIT NONE


INCLUDE "YOETHF.h"
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).LT.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