Decision Support for Selecting Projected Intensity-Duration-Frequency Curve Change Factors

A Guide for Stormwater Professionals

Krista Romita Grocholski, Michelle E. Miro, Sarah Fendrich

ToolPublished Mar 20, 2026

This document provides guidance for stormwater professionals on how to select and apply change factors from the Projected Intensity‑Duration‑Frequency Curve Data Tool for the Chesapeake Bay Watershed and Virginia through a structured, risk-based decision process. Rather than prescribing a single correct choice, the guidance enables users to connect technical data selections to their project goals, local conditions, and tolerance for risk.

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Romita Grocholski, Krista, Michelle E. Miro, and Sarah Fendrich, Decision Support for Selecting Projected Intensity-Duration-Frequency Curve Change Factors: A Guide for Stormwater Professionals. Santa Monica, CA: RAND Corporation, 2026. https://www.rand.org/pubs/tools/TLA4308-2.html.
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This work was funded by the United States Environmental Protection Agency and conducted in the Infrastructure and Justice Program of RAND Education, Employment, and Infrastructure.

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