diff --git a/docs/examples/twri.py b/docs/examples/twri.py
index 35d17d24..b0a72435 100644
--- a/docs/examples/twri.py
+++ b/docs/examples/twri.py
@@ -254,7 +254,7 @@ def plot_head(head, workspace):
 
 # add array based inputs
 # TODO: needs type checking and list consolidation support (see comments in gwf init)
-gwf.chd = [chdg]
+gwf.chdg = [chdg]
 gwf.drng = [drng]
 gwf.welg = [welg]
 gwf.rcha = [rcha]
diff --git a/flopy4/mf6/codec/reader/grammar/basic.lark b/flopy4/mf6/codec/reader/grammar/basic.lark
index af2f3415..c7b256c0 100644
--- a/flopy4/mf6/codec/reader/grammar/basic.lark
+++ b/flopy4/mf6/codec/reader/grammar/basic.lark
@@ -4,7 +4,7 @@ block_name: CNAME [INT]
 _list: line*
 line: [WS] item+ _NL+
 item: word | NUMBER
-word: /[a-zA-Z0-9._'~,-\\(\\)]+/
+word: /[a-zA-Z0-9._'~,+-\\(\\)]+/
 
 %import common.NEWLINE -> _NL
 %import common.WS
diff --git a/flopy4/mf6/codec/reader/grammar/typed.lark b/flopy4/mf6/codec/reader/grammar/typed.lark
index a3248bc4..c4342949 100644
--- a/flopy4/mf6/codec/reader/grammar/typed.lark
+++ b/flopy4/mf6/codec/reader/grammar/typed.lark
@@ -19,7 +19,7 @@ filename: ESCAPED_STRING | word
 data: double+
 record: token+ NEWLINE
 token: number | word
-word: /(?!(?i:begin|end))[a-zA-Z0-9._'~,-\\(\\)]+/
+word: /(?!(?i:begin|end))[a-zA-Z0-9._'~,+-\\(\\)]+/
 _token: word | number
 
 %import common.NEWLINE
diff --git a/flopy4/mf6/codec/writer/filters.py b/flopy4/mf6/codec/writer/filters.py
index bf9fa0ac..098260c8 100644
--- a/flopy4/mf6/codec/writer/filters.py
+++ b/flopy4/mf6/codec/writer/filters.py
@@ -115,7 +115,7 @@ def array2string(value: NDArray) -> str:
     format = (
         "%d"
         if np.issubdtype(value.dtype, np.integer)
-        else "%.9f"
+        else "%.9e"
         if np.issubdtype(value.dtype, np.floating)
         else "%s"
     )