In the sewer section of Resident Evil 2, facing G-Adults can indeed be a formidable challenge due to their speed and threats. Here are some comprehensive strategies to effectively navigate this hazardous area while minimizing encounters and conserving resources:

1. Utilize Powerful Weapons to Stagger G-Adults
When you exit the King/Queen passage, be prepared to encounter G-Adults. Equip an upgraded weapon, such as flame rounds or spark shots. Flame rounds can temporarily stagger G-Adults, giving you precious moments to maneuver past them. Spark rounds have the potential to take them down in one hit, which can significantly ease your path. After delivering a shot, quickly move past the staggered enemy to avoid further confrontation.

2. Employ Grenades for Crowd Control
In scenarios where multiple G-Adults converge, using grenades can be a lifesaver. A well-timed grenade can stun several G-Adults at once, allowing an opening to run past them while they are incapacitated. This strategy is especially beneficial in tight spaces where retreating can be tricky.

3. Focus on Eliminating the First G-Adult Encountered
In tight quarters with multiple G-Adults, such as a room with three of them, prioritize taking out the first G-Adult you encounter. By dispatching the first one, you lessen the number of enemies you have to deal with, making it easier to bypass the remaining ones. For instance, in that same room, after eliminating the first G-Adult, you can dodge the second and third by hugging the left wall to navigate to safety.

4. Familiarize Yourself With Spawn and Movement Patterns
Understanding G-Adults’ spawn locations can give you a significant advantage. Some G-Adults exhibit fixed spawn points but may have slight variations in their emergence. Position yourself to initially avoid their spread—for example, carefully maneuvering past the last G-Adult exiting a pipe before you reach the ladder. This knowledge allows for more strategic planning of your movements.

5. Conserve Ammo and Bypass Unnecessary Fights
While it might be tempting to engage every enemy, you can often bypass many G-Adults by running past them with careful movements. Trust your evasion skills and reserve your ammunition and grenades for critical moments. Engaging only when absolutely necessary can ensure you have enough resources for future encounters.

Summary
To effectively navigate the sewer section teeming with G-Adults, prioritize stagger tactics using powerful weaponry or grenades, eliminate key foes, and make use of environmental knowledge for evasion. Employing stealthy maneuvering and bypassing as many enemies as possible aids in conserving crucial resources. By mastering these techniques, you can enhance your survivability and progress through the sewers with less stress.