diff --git a/examples/telemac3d/bump_static/doc/bump_static.tex b/examples/telemac3d/bump_static/doc/bump_static.tex
index 220951b501981d36c5be786bae15902014f6f95b..6a624e2cf824556ba9747ffbcd7e43c79d25da1a 100644
--- a/examples/telemac3d/bump_static/doc/bump_static.tex
+++ b/examples/telemac3d/bump_static/doc/bump_static.tex
@@ -171,11 +171,17 @@ temperature field (less diffusion):
 The extra cost for CPU time is very moderate for this test-case compared to the
 PSI-type MURD scheme.
 
+Using \telkey{TIDAL FLATS} = YES (default choice) improves mass conservation
+(water depth + tracer, for water depth up to machine accuracy).
+
 Setting the 3 keywords \telkey{IMPLICITATION FOR DEPTH} and
 \telkey{IMPLICITATION FOR VELOCITIES}, \telkey{TREATMENT OF NEGATIVE DEPTHS} to
 their default values (0.55 ; 0.55 ; 2) does not significantly change the results
 and does not significantly increase CPU time.
 
+Using \telkey{PRECONDITIONING FOR DIFFUSION OF VELOCITIES} = 34 = 2 $\times$ 17
+improves the efficiency to solve the diffusion of velocities.
+
 \section{Initial results (from Lamia Abbas's post-doctoral)}
 
 If the diffusion of the tracer is not accounted, \emph{i.e.} if $\nu_{T} = 0$
diff --git a/examples/telemac3d/bump_static/f3d_bump_static.slf b/examples/telemac3d/bump_static/f3d_bump_static.slf
index b8bbf6f2d72a491d7c3a5ca24175288ab9ee913f..c0b2af5e7c70af2fe8faa3367248df3b4ddb8b00 100644
--- a/examples/telemac3d/bump_static/f3d_bump_static.slf
+++ b/examples/telemac3d/bump_static/f3d_bump_static.slf
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:e8b3432e313590dcd72e0da1c822c05ba66353b6b903ab53bff8b82ea143cc40
+oid sha256:aa738cd9c9c40b4e98172943a43f9ee87684257cbaffe7c818fa9fc860332d3c
 size 8428092
diff --git a/examples/telemac3d/bump_static/t3d_bump_static.cas b/examples/telemac3d/bump_static/t3d_bump_static.cas
index 639d6195e371489046152efed1624c4e07c3abb1..57257ade8563c493927c4c381a5d7701023a625b 100644
--- a/examples/telemac3d/bump_static/t3d_bump_static.cas
+++ b/examples/telemac3d/bump_static/t3d_bump_static.cas
@@ -1,8 +1,3 @@
-/----------------------------------------------------------------------
-/                        TELEMAC-3D CALCULATION
-/----------------------------------------------------------------------
-/                        SOFTWARE ENVIRONMENT
-/----------------------------------------------------------------------
 FORTRAN FILE             : 'user_fortran'
 BOUNDARY CONDITIONS FILE : geo_bump_static.cli
 GEOMETRY FILE            : geo_bump_static.slf
@@ -28,8 +23,6 @@ NUMBER OF HORIZONTAL LEVELS        : 40
 /----------------------------------------------------------------------
 /                        NUMERICAL OPTIONS
 /----------------------------------------------------------------------
-TIDAL FLATS : NO
-
 MASS-BALANCE : YES
 /CONSTANT VISCOSITY
 VERTICAL TURBULENCE MODEL : 1
@@ -39,6 +32,7 @@ COEFFICIENT FOR VERTICAL DIFFUSION OF VELOCITIES   : 0.003
 SCHEME FOR ADVECTION OF VELOCITIES                 : 4
 
 ACCURACY FOR DIFFUSION OF VELOCITIES : 1.E-8
+PRECONDITIONING FOR DIFFUSION OF VELOCITIES = 34
 ACCURACY FOR PPE                     : 1.E-6
 /----------------------------------------------------------------------
 /                        PHYSICAL OPTIONS
diff --git a/examples/telemac3d/bump_static/vnv_bump_static.py b/examples/telemac3d/bump_static/vnv_bump_static.py
index 023a2f315d5da109063b74b03da0df65e98d27e7..b42a0ca610e52695fa557a14c9a1a5d566556910 100644
--- a/examples/telemac3d/bump_static/vnv_bump_static.py
+++ b/examples/telemac3d/bump_static/vnv_bump_static.py
@@ -50,17 +50,17 @@ class VnvStudy(AbstractVnvStudy):
         # Comparison with the last time frame of the reference file.
         self.check_epsilons('vnv_1:T3DRES',
                             'f3d_bump_static.slf',
-                            eps=[1.E-9])
+                            eps=[1.E-7, 1.E-9, 1.E-9, 1.E-9, 2.E-6])
 
         # Comparison with the last time frame of the reference file.
         self.check_epsilons('vnv_2:T3DRES',
                             'f3d_bump_static.slf',
-                            eps=[1.E-7,1.E-9,1.E-9,1.E-9,1.E-6])
+                            eps=[1.E-7, 1.E-9, 1.E-9, 1.E-9, 2.E-6])
 
         # Comparison between sequential and parallel run.
         self.check_epsilons('vnv_1:T3DRES',
                             'vnv_2:T3DRES',
-                            eps=[1.E-7,1.E-9,1.E-9,1.E-9,1.E-6])
+                            eps=[1.E-7, 1.E-9, 1.E-9, 1.E-9, 2.E-6])
 
 
     def _post(self):