Flood Stage Estimate for Walnut Creek @ Ygnacio WCY on Walnut Creek, Walnut Creek
Flood stages have been determined for the stream gauge called Walnut Creek @ Ygnacio. The plot on the right shows the latest stage data with horizontal lines for the gauge stages at locations in the table below. Walnut Creek @ Ygnacio is located just upstream (south) of Ygnacio Vly Road on Walnut Creek Channel in Walnut Creek. Flood Stage Report and Maps. Gauge Location Link Please report flooding location and time: Report Flooding from Walnut Creek
FLOOD STAGES Readings at the gauge that could indicate flooding at the location.
Flooding Order	Gauge Stage	Flooding Locations
3rd	16.8	Civic Park West Side
2nd	16.3	Civic Drive | Civic Park East Side
1st	12.2	Arroyo Way
How was the flood stage developed?	Computer Model Existing models were used for this gauge. Flows from existing hydrology points were used in the model. Some of these were estimated using proportion to other return period scenarios.
Certainty of flood stage accuracy?	We have 80% confidence in the model results. The model was developed from as-built plans of the creek channel as well as LiDAR for the more natural area area around Civic Park. The reaches that are underground from North Broadway under the shoping areas was modeled from plans. Under the shoping area     LiDAR stands for Light Detection and Ranging. It's a technology that uses laser light to measure distances.
Future Efforts	The FC District may send postcard information to properties along the creek. This could include information on how they can help fine-tune the flood stage by reporting where and when flooding is experienced.
View Walnut Creek @ Ygnacio flood stages: WCY Direct Plot Link.
Please report flooding location and time: Report Flooding from Walnut Creek
Click here for Flood Stage Report and Maps

Date: 4/21/2025 16:29:04

File location: G:\fldctl\Hydrology\Streamflow\Flood Stage Web Docs\AA-Merge_HTML.docm