This document discusses the development of tools to help manage and assess hydromodification, which is the alteration of natural flow patterns caused by increased impervious surfaces like roads and buildings. It summarizes previous related studies and outlines the major tasks of the current project, which include developing protocols to classify stream susceptibility, monitoring impacts, predictive models, and management tools. The expected products are screening and assessment tools to evaluate hydromodification risks and impacts, as well as mitigation tools to guide management strategies based on stream and catchment conditions and the level of development.

1. Developing Tools for Hydromodification Management and Assessment Eric Stein S. Ca. Coastal Water Research Project (SCCWRP) [email_address]

3. Effect of Increased Impervious Cover Hydromodification

4. Effects of Hydromodification

8. Conclusions of Past Studies Empirical Analysis (S. Ca.)

9. Conclusions of Past Studies Empirical Analysis (S. Ca.) Logistic Regression (Modeling) (S.F. Bay Area)

12. Preliminary Study Sites Data to support : - Development of screening tool - Calibration of predictive models - Development of standard monitoring protocols

19. Interaction of Models

21. What is Appropriate Management Response? Hasley Canyon Wash

23. Questions? Eric Stein 714-755-3233 [email_address]