The Master Planning Program produces drainageway and watershed master plans based on the following four key policy decisions which guide the program implementation:
- Each master planning effort must be requested by the local governments and should have a multi-jurisdictional aspect;
- Master plans are completed by consultants acceptable to all local project sponsors and UDFCD;
- UDFCD will pay up to 50% of the study costs, with the local sponsors sharing the remainder of the costs; and
- The master plan must be acceptable to all the affected local governments.
There are two types of drainage master plans, which are:
1. Major Drainageway Planning Studies, which are based on hydrologic analyses from CUHP and SWMM and on hydraulic analyses from HEC-RAS. These studies generally identify and delineate a floodplain and make recommendations to mitigate the flood hazard, as well as to improve the safety and function of the waterway. These studies are sometimes completed in conjunction with a Flood Hazard Area Delineation Study. Recommendations may include:
- Channel enlargement and/or stabilization of channel banks and bottom;
- Longitudinal grade control of channel invert;
- Crossing improvements;
- Floodplain preservation;
- Detention for flood mitigation and water quality; and
- Benefit – Cost Analyses where benefit is generally measured as reduced flood damages.
2. Outfall Systems Planning Studies, which are also based on hydrology from CUHP and SWMM but utilize only limited hydraulics analyses (no HEC-RAS). These studies typically do not identify a floodplain. Recommendations may include:
- Detention for flood mitigation and water quality
- Storm sewer improvements
- Crossing improvements
- Channel enlargement and stabilization
- Floodplain preservation
Master plan recommendations can be remedial or preventive.
Master plans are an important tool to help identify projects for construction. The master plans also provide valuable input to UDFCD's Five Year Capital Improvement Program. They help guide new land development projects to be consistent with regional drainage and stormwater quality needs, and help to identify and acquire land and rights-of-way for future capital improvements, for drainageway maintenance, and for floodplain preservation. Master plan recommendations can be remedial or preventive.
The following links provide information to current and recently completed UDFCD drainageway master planning projects.
|
