diff --git a/swash/processing/sws_npz.py b/swash/processing/sws_npz.py
index c79d4c5..1274732 100644
--- a/swash/processing/sws_npz.py
+++ b/swash/processing/sws_npz.py
@@ -28,7 +28,7 @@ bathy = pd.read_hdf(data_out.joinpath("bathy.h5"), "bathy")
 n_x = bathy.index.size
 
 log.info(f"Reading swash output from '{sws_out}'")
-botl = read_nohead_scalar(sws_out.joinpath("botl.dat"), n_x)[0, :]
+botl = read_nohead_scalar(sws_out.joinpath("botl.dat"), n_x)
 dep = np.maximum(0, read_nohead_scalar(sws_out.joinpath("dep.dat"), n_x))
 vel = read_nohead_vect(sws_out.joinpath("vel.dat"), n_x)
 
@@ -39,5 +39,5 @@ t = np.arange(0, n_t * dt, dt)
 log.info(f"Writing npz file in '{inp}'")
 inp.mkdir(exist_ok=True)
 np.savez_compressed(
-    inp.joinpath("sws"), x=bathy.index, t=t, botl=botl, dep=dep, vel=vel
+    inp.joinpath("sws"), x=bathy.index, t=t, botl=botl[0, :], dep=dep, vel=vel
 )