diff --git a/lib/Controller/EntityController.php b/lib/Controller/EntityController.php
index 29b88e3..44edf8e 100644
--- a/lib/Controller/EntityController.php
+++ b/lib/Controller/EntityController.php
@@ -71,6 +71,10 @@ class EntityController extends Controller {
 	 */
 	public function delete($identifier) {
 		$entity = $this->get($identifier);
+		
+		if ($entity instanceof Model\Channel) {
+			$entity->clearData($this->em);
+		}
 
 		$this->em->remove($entity);
 		$this->em->flush();
diff --git a/lib/Model/Channel.php b/lib/Model/Channel.php
index 3f246b3..0954a76 100644
--- a/lib/Model/Channel.php
+++ b/lib/Model/Channel.php
@@ -49,14 +49,25 @@ class Channel extends Entity {
 		$this->data = new ArrayCollection();
 		$this->groups = new ArrayCollection();
 	}
-
+	
 	/**
 	 * Add a new data to the database
-	 * @todo move to Logger\Logger?
 	 */
 	public function addData(\Volkszaehler\Model\Data $data) {
 		$this->data->add($data);
 	}
+	
+	
+	/**
+	 * Purge data
+	 *
+	 * prevents doctrine of using single delete statements
+	 * @todo filter from & to
+	 */
+	public function clearData(\Doctrine\ORM\EntityManager $em) {
+		$sql = 'DELETE FROM data WHERE channel_id = ?';
+		return $em->getConnection()->executeQuery($sql, array($this->id));
+	}
 }
 
 ?>
diff --git a/lib/Model/Entity.php b/lib/Model/Entity.php
index 25197da..c59faba 100644
--- a/lib/Model/Entity.php
+++ b/lib/Model/Entity.php
@@ -59,7 +59,7 @@ abstract class Entity {
 	protected $type;
 
 	/**
-	 * @OneToMany(targetEntity="Property", mappedBy="entity", cascade={"persist"}, orphanRemoval=true)
+	 * @OneToMany(targetEntity="Property", mappedBy="entity", cascade={"remove", "persist"}, orphanRemoval=true)
 	 * @OrderBy({"key" = "ASC"})
 	 */
 	protected $properties = NULL;