Boulder Creek Model Background

The original Boulder Creek model was created by the United States Army Corp of Engineers (USACE) using HEC-1. The original HEC-1 model used the SCS Curve Number methodology and the Muskingum routing method for the calculations. These methods were accurately reproduced in the spreadsheet version and resulted in identical results for the same design storm. Model output was obtained and the sub-basin unit hydrographs were used directly in the real-time model.

Methods Used
• Thiessen Polygon Rain Gage Weighting
• SCS Rainfall Runoff Method
• Muskingum Routing Channel Routing

The original USACE HEC-1 model has a total of 15 sub-basins. The real-time hydrologic model has a total of 14 sub-basins. The HEC-1 model had 15 sub-basins, including a basin for modeling Barker Reservoir. However, because Barker Reservoir has sufficient flood capacity, BC- 1 was not included in the real-time model. The original design points specified in the HEC-1 model were used in the real-time model.

Model Inputs