Looking for Case studies for areas that have been impacted by climate changes related to the hydrological cycle

Hi,    I, Peter Petersen, am a water chemist working at a local municipal water treatment plant.  I am currently writing an extensive water treatment training manual called "Everything Water Treatment Plant Operators Need to Know about Water: From Drops To Entry Point". This manual is intended for people who are new to the field; taking certification exams; or refreshing their knowledge. This project was born of my frustration with the reference materials available when studying for the water exam.  The focus of the manual, to provide a basic knowledge of water treatment, consolidates some of the existing reference materials in an easy-to-understand format. The manual will also be useful both as a study guide for certification exams and a reference book. This manual will be broken down into several sections.   Within this manual, I am covering subjects such as:  · How water drops are formed,· How various water sources are formed,· How various components of the hydrological cycle work· How climate change impact the hydrological cycle· How the properties of carbon dioxide influence the climate change· How the terms, climate, climate warming, and global warning related or differ· How various water treatment processes work, including the operation and troubleshooting of equipment and instrumentation,· How different factors affect water quality as it makes its way through each treatment process.  I have included some of the water quality regulatory requirements and I cover complex issues that today’s WTP Operators and the Managers have to address on a day to day basis to protect the consumer, and ensure safe water for years to come. I also include water quality and operational issues frequently and infrequently encountered in the water treatment process and how experienced operators responded to those concerns. Also included is information on the state of the art instrumentation currently being used in the field and in the laboratory.  As part of the current series, “Hydrological Cycle and Climate Change”, I am looking for case studies for areas that have been impacted by climate changes, whether they have in the recent years experienced more frequent periods of flooding or drought, or loss or reduction of a water source. I am interested in knowing the water sources for these areas, and the steps which the local community took to response to those events and the steps which they are taking to prepare for future similar events. I will also like to know what technologies they implemented, and what improvements to water quality or quantity were documented.  I am also interested in how the watershed was impacted  by the climate changes to the area before any work was done.      I’m also interested in hearing how local water suppliers and public utilities worked with local communities and county/district/state planners to  develop water budgets to reduce the impact plans to reduce the impact of similar future events.   Thank you for your inputs!