A reservoir has a diameter greater than its height. Capacities range from 30,000 gallons to 15,000,000 gallons. Reservoirs are generally built at higher elevations to maximize water pressure, and they are designed and built to the AWWA D-100 standard. Welded steel tanks offer many advantages over concrete and bolted tanks.

Advantages over Concrete Tanks:	Advantages over Bolted Tanks:
Economical	Life expectancy	Leaks
Flexibility in Design	Coatings	Welded
Zero Leakage	Tank Repairs	Roofs
Unlimited life cycle	Shell thickness	Warranty
Easy to repair and maintain	Vandalism
Flexible in a seismic event	Structural integrity