--- a/pkg/common/attributes.go	Fri Mar 08 18:57:58 2019 +0100
+++ b/pkg/common/attributes.go	Fri Mar 08 19:15:47 2019 +0100
@@ -4,12 +4,13 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 // License-Filename: LICENSES/AGPL-3.0.txt
 //
-// Copyright (C) 2018 by via donau
+// Copyright (C) 2018, 2019 by via donau
 //   – Österreichische Wasserstraßen-Gesellschaft mbH
 // Software engineering by Intevation GmbH
 //
 // Author(s):
 //  * Sascha L. Teichmann <sascha.teichmann@intevation.de>
+//  * Tom Gottfried <tom.gottfried@intevation.de>
 
 package common
 
@@ -158,6 +159,24 @@
 	return ca.Set(key, v)
 }
 
+func (ca Attributes) Float(key string) (float64, bool) {
+	s, found := ca.Get(key)
+	if !found {
+		return 0, false
+	}
+	f, err := strconv.ParseFloat(s, 64)
+	if err != nil {
+		log.Printf("error: %v\n", err)
+		return 0, false
+	}
+	return f, true
+}
+
+func (ca Attributes) SetFloat(key string, value float64) bool {
+	v := strconv.FormatFloat(value, 'e', -1, 64)
+	return ca.Set(key, v)
+}
+
 func (ca Attributes) Duration(key string) (time.Duration, bool) {
 	s, found := ca.Get(key)
 	if !found {