Parallel drainage pattern. A parallel drainage system is a pattern of rivers caused by steep slopes with some relief. Because of the steep slopes, the streams are swift and straight, with very few tributaries, and all flow in the same direction.
1 In Creative, the player can use spawn eggs to spawn most mobs. 2  When mobs are spawned this way, all normal spawning requirements, such as light level and block type, are ignored. 3  Any entity can be spawned using the /summon command.
Figure 4.9 shows the end result perched under the mob farm, but Iâll take you through it step by step, starting at ground level as a proof of concept: 1  Start with a two-block-wide water channel, eight blocks long, as shown in Figure 4.10, with walls two blocks high to provide sufficient height for passage of the mobs.