Project Background and Purpose:

• Under contract with the Orange County Department of Public Works, SAI prepared a comprehensive stormwater plan for this basin.

• The objectives of the project included the following:

1. Identification of the causes of problematic flooding, and

2. Development of capital improvements to provide flood protection and water quality enhancement where possible.

 

Stormwater Modeling / Investigation:

• The project area consists primarily of residential and office park developments mixed with open space or natural land uses.

• Localized flooding has been reported in the residential areas and was attributed to inadequate stormwater collection systems.

• An existing conditions adICPR model was developed through extensive site reconnaissance as well as the review of numerous reports, previous studies, permits, construction plan sets, aerials, and topographic maps.

• Hydrologic parameters (i.e., basin areas and SCS curve numbers) were calculated using geoprocessing techniques.

• In order to address the reported flooding concerns, the adICPR model was refined to include portions of the secondary drainage systems.  Reported flooding was verified by model results.

• Capital improvement recommendations included replacement of secondary drainage systems, channel improvements and pond construction.

• Proposed improvements were coordinated with another consultant who was responsible for concurrent sanitary sewer improvements in the area.

• A detailed engineering report was prepared describing all findings of the study phase of the investigation as well as the design recommendations.

• Construction documents were prepared for the proposed improvements.

• Pre-application meetings were conducted with the SJRWMD to present and discuss the proposed improvements.

• MSSW and ERP permits have been granted by the SJRWMD for most aspects of this project.