Hydrology Section staff collects and analyzes precipitation and runoff data. They maintain rainfall and stream gauges and equipment. Staff also prepares hydrological analysis of watersheds, data, and engineering charts for use in project development.
The Hydrology Section provides the following services:
Design flow rate and hydrograph services include:
Determination of flow rates:
2-, 5-, 10-, 25-, 50- and 100-year flows
Review of flow rates calculated by others
Production of hydrographs using our specific unit hydrograph method.
Review of proposed watershed modifications such as:
Mitigation of increased impervious surface not planned for in current Drainage Area land use maps
Proposed revisions and updates to Drainage Area Plans
Review of hydrologic impacts of watershed changes to existing hydrologic model
Hydrologic data collection, analysis, and reporting
Maintenance of rain and stream gauges
Collection of rain and stream gauge data from District gauges
Collection of published data from EBMUD, National Weather Service, US Army Corps of Engineers, and other agencies gauge data
Frequency and correlation analysis of collected data
Analysis and reporting of major storm events for understanding of the storms statistical return period
HMS Guidance and Template Model
The FC District has written a draft guidance on how to use the FC District method in HMS. We have also built a template HEC-HMS model that uses FC District methods. This template is available for use by others. Both the guidance and template model can be found through links on the left sidebar of our Documents and Standards page.