混合和水质模型可分为数学模型或物理模型。数学模型利用方程来描述混合和水质动态，而物理模型是设施的实际比例模型。成品水储存设施通常采用两种数学模型:系统模型和基于流体动力学的模型。在系统模型中，重点是匹配进入和离开储存设施的水质现场数据。系统模型的例子包括完全混合（CSTR）模型、塞流模型和多室模型。另一方面，流体力学模型利用从全Navier-Stokes方程导出的流动方程来模拟储罐或水库内流动的内部行为。一类被称为计算流体力学（CFD）模型的模型，用于广泛的化学和热力学应用，可以用来表示不同的储罐和储层配置。 可以构建物理比例模型来模拟任何储罐或蓄水池配置。此类模型依赖于相似性原则，以确保它们充分代表实际大型设施中的行为。染料或其他示踪剂用于研究内部混合特性。每种类型的模型都有各种各样的优点和成本，本文将讨论这些优点和成本，并可用于储罐和水库的研究。上述每一种模型都被应用于加利福尼亚州阿祖萨最近建造的Ed Heck水库的氯动力学研究中。

Mixing and water quality models may be categorized as mathematical or physical models. Mathematical models utilize equations to describe the mixing and water quality dynamics while physical models are actual scale models of the facility. Two general types of mathematical models have been applied to finished water storage facilities: systems models and hydrodynamically based models. With systems models, emphasis is placed on matching field data of the water quality entering and leaving the storage facility. Examples of systems models include the completely mixed (CSTR) model, plug flow models and multi-compartment models. On the other hand, hydrodynamic models utilize flow equations derived from the full Navier-Stokes equations to simulate the internal behavior of flow within the tank or reservoir. A class of models referred to as Computational Fluid Dynamics (CFD) models, used in a wide range of chemical and thermodynamic applications, may be set up to represent different tank and reservoir configurations. Physical scale models may be constructed to simulate any tank or reservoir configuration. Such models rely upon similitude principles to assure that they adequately represent the behavior in the actual larger facility. Dyes or other tracers are used to study the internal mixing characteristics. Each of these types of models have various advantages and costs which are discussed in this paper and may be used in studies of tanks and reservoirs. Each of the aforementioned types of models was applied in a study of chlorine dynamics in the recently constructed Ed Heck Reservoir in Azusa, California.