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:
Collection and reporting of rain and stream gauge data from District gauges
Determination of flow design rate flow rates for: 2-, 5-, 10-, 25-, 50- and 100-year flows
Review of flow rates and model provided 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
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The FC District has written a draft guidance on how to use the FC District method in HMS.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. The HEC-HMS Guidance document and HMS Template are available through links on the left sidebar of our Hydrograph Standards page.