diff --git a/src/pocketmine/level/format/Chunk.php b/src/pocketmine/level/format/Chunk.php
index 1cdd00561..01835e32d 100644
--- a/src/pocketmine/level/format/Chunk.php
+++ b/src/pocketmine/level/format/Chunk.php
@@ -461,66 +461,6 @@ class Chunk{
 		$this->biomeIds{($z << 4) | $x} = chr($biomeId & 0xff);
 	}
 
-	/**
-	 * Returns a column of block IDs from bottom to top at the specified X/Z chunk block coordinates.
-	 * @param int $x 0-15
-	 * @param int $z 0-15
-	 *
-	 * @return string
-	 */
-	public function getBlockIdColumn(int $x, int $z) : string{
-		$result = "";
-		foreach($this->subChunks as $subChunk){
-			$result .= $subChunk->getBlockIdColumn($x, $z);
-		}
-		return $result;
-	}
-
-	/**
-	 * Returns a column of block meta values from bottom to top at the specified X/Z chunk block coordinates.
-	 * @param int $x 0-15
-	 * @param int $z 0-15
-	 *
-	 * @return string
-	 */
-	public function getBlockDataColumn(int $x, int $z) : string{
-		$result = "";
-		foreach($this->subChunks as $subChunk){
-			$result .= $subChunk->getBlockDataColumn($x, $z);
-		}
-		return $result;
-	}
-
-	/**
-	 * Returns a column of sky light values from bottom to top at the specified X/Z chunk block coordinates.
-	 * @param int $x 0-15
-	 * @param int $z 0-15
-	 *
-	 * @return string
-	 */
-	public function getBlockSkyLightColumn(int $x, int $z) : string{
-		$result = "";
-		foreach($this->subChunks as $subChunk){
-			$result .= $subChunk->getBlockSkyLightColumn($x, $z);
-		}
-		return $result;
-	}
-
-	/**
-	 * Returns a column of block light values from bottom to top at the specified X/Z chunk block coordinates.
-	 * @param int $x 0-15
-	 * @param int $z 0-15
-	 *
-	 * @return string
-	 */
-	public function getBlockLightColumn(int $x, int $z) : string{
-		$result = "";
-		foreach($this->subChunks as $subChunk){
-			$result .= $subChunk->getBlockLightColumn($x, $z);
-		}
-		return $result;
-	}
-
 	/**
 	 * @return bool
 	 */
diff --git a/src/pocketmine/level/generator/populator/GroundCover.php b/src/pocketmine/level/generator/populator/GroundCover.php
index 1410beb0a..1218b449a 100644
--- a/src/pocketmine/level/generator/populator/GroundCover.php
+++ b/src/pocketmine/level/generator/populator/GroundCover.php
@@ -23,6 +23,7 @@ declare(strict_types=1);
 
 namespace pocketmine\level\generator\populator;
 
+use pocketmine\block\Block;
 use pocketmine\block\BlockFactory;
 use pocketmine\block\Liquid;
 use pocketmine\level\biome\Biome;
@@ -43,9 +44,9 @@ class GroundCover extends Populator{
 						$diffY = 1;
 					}
 
-					$column = $chunk->getBlockIdColumn($x, $z);
 					for($y = 127; $y > 0; --$y){
-						if($column{$y} !== "\x00" and !BlockFactory::get(ord($column{$y}))->isTransparent()){
+						$id = $chunk->getBlockId($x, $y, $z);
+						if($id !== Block::AIR and !BlockFactory::get($id)->isTransparent()){
 							break;
 						}
 					}
@@ -53,10 +54,11 @@ class GroundCover extends Populator{
 					$endY = $startY - count($cover);
 					for($y = $startY; $y > $endY and $y >= 0; --$y){
 						$b = $cover[$startY - $y];
-						if($column{$y} === "\x00" and $b->isSolid()){
+						$id = $chunk->getBlockId($x, $y, $z);
+						if($id === Block::AIR and $b->isSolid()){
 							break;
 						}
-						if($b->canBeFlowedInto() and BlockFactory::get(ord($column{$y})) instanceof Liquid){
+						if($b->canBeFlowedInto() and BlockFactory::get($id) instanceof Liquid){
 							continue;
 						}
 						if($b->getDamage() === 0){