diff --git a/e2e/remous.e2e-spec.ts b/e2e/remous.e2e-spec.ts
index f79ad021fc64051b3603da1f4ef797663c59e3ff..78e1668ba1eeeede932a28dc7b749a2748a1d8f4 100644
--- a/e2e/remous.e2e-spec.ts
+++ b/e2e/remous.e2e-spec.ts
@@ -3,6 +3,7 @@ import { CalculatorPage } from "./calculator.po";
 import { browser } from "protractor";
 import { Navbar } from "./navbar.po";
 import { PreferencesPage } from "./preferences.po";
+import { SideNav } from "./sidenav.po";
 
 /**
  * Remous
@@ -12,12 +13,14 @@ describe("ngHyd − remous", () => {
     let calcPage: CalculatorPage;
     let navBar: Navbar;
     let prefPage: PreferencesPage;
+    let sidenav: SideNav;
 
     beforeEach(async () => {
         listPage = new ListPage();
         prefPage = new PreferencesPage();
         calcPage = new CalculatorPage();
         navBar = new Navbar();
+        sidenav = new SideNav();
         // disable evil option "empty fields on module creation"
         await prefPage.navigateTo();
         await prefPage.disableEvilEmptyFields();
@@ -70,4 +73,24 @@ describe("ngHyd − remous", () => {
         const hasResults = await calcPage.hasResults();
         expect(hasResults).toBe(true);
     });
+
+    it("Check that calculation with dx >= reach length fails", async () => {
+        // load backwater curve session file with Dx>=Long
+        await navBar.clickMenuButton();
+        await browser.sleep(200);
+        await sidenav.clickLoadSessionButton();
+        await browser.sleep(200);
+        await sidenav.loadSessionFile("./session/session-remous-dx-bief.json");
+        await browser.sleep(500);
+
+        // Calculate, the calculation should fail
+        await calcPage.getCalculateButton().click();
+        await browser.sleep(500);
+
+        // check error message in log
+        expect(await calcPage.nbLogEntries()).toBe(1);
+
+        // check there is no result
+        expect(await calcPage.presentAndVisible("var-results")).toBe(false);
+    });
 });
diff --git a/e2e/session/session-remous-dx-bief.json b/e2e/session/session-remous-dx-bief.json
new file mode 100644
index 0000000000000000000000000000000000000000..cd0a7218332564e1a6dcc6d804b53b61e96e1288
--- /dev/null
+++ b/e2e/session/session-remous-dx-bief.json
@@ -0,0 +1 @@
+{"header":{"source":"jalhyd","format_version":"1.3","created":"2022-06-30T14:31:54.872Z"},"settings":{"precision":1e-7,"maxIterations":100},"documentation":"","session":[{"uid":"amozNT","props":{"calcType":"CourbeRemous","methodeResolution":"RungeKutta4"},"children":[{"uid":"ZzIyZm","props":{"calcType":"Section","nodeType":"SectionRectangle"},"children":[],"parameters":[{"symbol":"Ks","mode":"SINGLE","value":157544.77102709157},{"symbol":"Q","mode":"SINGLE","value":983277.9803235843},{"symbol":"YB","mode":"SINGLE","value":984997.3273467234},{"symbol":"LargeurBerge","mode":"SINGLE","value":756267.5581282576}]}],"parameters":[{"symbol":"Long","mode":"SINGLE","value":639697.7975510269},{"symbol":"Dx","mode":"SINGLE","value":680775.9048205647},{"symbol":"Z1","mode":"SINGLE","value":662459.5272556832},{"symbol":"Z2","mode":"SINGLE","value":142093.39302660408},{"symbol":"ZF1","mode":"SINGLE","value":150635.28017481393},{"symbol":"ZF2","mode":"SINGLE","value":-375069.6377087354}]}]}
\ No newline at end of file
diff --git a/jalhyd_branch b/jalhyd_branch
index d64531f1305e091791eac674c3a36d86b9e17ddd..094bda298f4c32b69e4a6b56399918bfde4dfca0 100644
--- a/jalhyd_branch
+++ b/jalhyd_branch
@@ -1 +1 @@
-devel
+316-courbe-de-remous-et-bief-remonter-une-erreur-quand-le-pas-de-discretisation-est-superieur-la
diff --git a/src/locale/messages.en.json b/src/locale/messages.en.json
index 5fb1a5f881380329cc1f30600f6b94346de7cba1..a1a25b70017432cc06086e18029a82697e9a54db 100755
--- a/src/locale/messages.en.json
+++ b/src/locale/messages.en.json
@@ -66,6 +66,7 @@
     "WARNING_REMOUS_PAS_CALCUL_DEPUIS_AVAL": "Downstream boundary condition < Critical elevation: no possible calculation from downstream",
     "ERROR_REMOUS_PAS_CALCUL": "No possible calculation, neither from upstream nor from downstream",
     "ERROR_REMOUS_PENTE_FORTE": "The water line slope is too steep at abscissa %x% m (the discretisation step should be reduced)",
+    "ERROR_REMOUS_PAS_SUPERIEUR_BIEF": "Discretisation step should be less than or equal to the reach length",
     "ERROR_RU_CIRC_LEVEL_TOO_HIGH": "Uniform flow cannot be calculated with a pipe under load",
     "ERROR_NEWTON_NON_CONVERGENCE": "Non-convergence (Newton's method)",
     "ERROR_SECTION_NON_CONVERGENCE_NEWTON_HCONJUG": "Non-convergence of the calculation of the combined depth (Newton's method)",
diff --git a/src/locale/messages.fr.json b/src/locale/messages.fr.json
index 5f937e2c3f4076c995ca85f011c42990d4194757..928503bff8935980624ffe1932ce2f66cd8eca70 100755
--- a/src/locale/messages.fr.json
+++ b/src/locale/messages.fr.json
@@ -66,6 +66,7 @@
     "WARNING_REMOUS_PAS_CALCUL_DEPUIS_AVAL": "Condition limite aval < Hauteur critique&nbsp;: pas de calcul possible depuis l'aval",
     "ERROR_REMOUS_PAS_CALCUL": "Aucun calcul possible ni depuis l'amont ni depuis l'aval",
     "ERROR_REMOUS_PENTE_FORTE": "La pente de la ligne d'eau est trop forte à l'abscisse %x% m (il faudrait réduire le pas de discrétisation)",
+    "ERROR_REMOUS_PAS_SUPERIEUR_BIEF": "Le pas de discrétisation doit être inférieur ou égal à la longueur du bief",
     "ERROR_RU_CIRC_LEVEL_TOO_HIGH": "Le régime uniforme ne peut pas être calculé avec une conduite en charge",
     "ERROR_NEWTON_NON_CONVERGENCE": "Non convergence (Méthode de Newton)",
     "ERROR_SECTION_NON_CONVERGENCE_NEWTON_HCONJUG": "Non convergence du calcul de la hauteur conjuguée (Méthode de Newton)",