From 830afd479c6ffa7afe033c577453d4c194598f29 Mon Sep 17 00:00:00 2001
From: Ayman Alzraiee <ayman.alzraiee@gmail.com>
Date: Thu, 26 Sep 2019 15:37:21 -0700
Subject: [PATCH] fix(mflak): allow lak class to use -1 for previous transient
 lake stress

---
 flopy/modflow/mflak.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/flopy/modflow/mflak.py b/flopy/modflow/mflak.py
index 6bad67c0c4..851626fafc 100644
--- a/flopy/modflow/mflak.py
+++ b/flopy/modflow/mflak.py
@@ -518,6 +518,8 @@ def write_file(self):
             itmp2 = 0
             if kper in ds9_keys:
                 itmp2 = 1
+            elif len(ds9_keys) > 0:
+                itmp2 = -1
             if isinstance(self.lwrt, list):
                 tmplwrt = self.lwrt[kper]
             else: