Most cities in Canada do not charge a stormwater fee; consequently, stormwater programs may need to compete with other funding priorities in public works. This often leads to a lack of dedicated and predictable cash flow, which can limit municipalities' capacity to sustain stormwater services. In such situations, it is useful to identify available revenue sources and expected expenditures, so that sustainable funding strategies can be determined. In this paper, we explore a novel system dynamics model to investigate sustainable funding strategies. The model consists of a qualitative assessment that uses causal loop diagrams to provide a conceptual system representation and a mathematical formulation for a quantitative assessment. The model is used to explore the potential of introducing stormwater fees in the city of Vernon, Canada. It is shown that the model is helpful in strategic asset management decision making, and can be used to build arguments for implementing proactive asset management programs.

加拿大大多数城市不收取雨水费；因此，雨水计划可能需要与公共工程中的其他资金优先事项竞争。这通常会导致缺乏专用且可预测的现金流，从而限制市政当局维持雨水服务的能力。在这种情况下，确定可用的收入来源和预期支出很有用，以便可以确定可持续的筹资策略。在本文中，我们探索了一种新颖的系统动力学模型来研究可持续的筹资策略。该模型由定性评估组成，该定性评估使用因果关系图来提供概念性系统表示形式和用于定量评估的数学公式。该模型用于探讨在加拿大弗农市引入雨水收费的潜力。