project deliverables
The project will be completed in four distinct phases: Baseline Hydrology Report, Alternatives Analysis, Flood Hazard Area Delineation (FHAD) Report and Conceptual Design Report. Each phase is designed to be a stand-alone document that can be accessed by the public. A draft report is submitted to the project sponsors for each phase, the project sponsors review the report, any necessary changes are made to the report, and then a final report is submitted.
Phase 1 - Baseline Hydrology Report
The baseline hydrology is the development of detailed and accurate hydrology to quantify the peak stormwater flows associated with different return frequency storm events. The hydrology will be evaluated for the 2-, 5-, 10-, 25-, 50- and 100-year return period storm events for existing land uses. The Niver Creek watershed is a primarily fully developed watershed with minimal changes anticipated for zoning and land use changes, thus the project sponsors have determined that the existing conditions hydrology will be the same as the future conditions hydrology. Only the future conditions hydrology will be produced for this report. The baseline hydrology results will identify the extent of surface flooding and identify problem areas.
Phase 2 – Alternatives Analysis
The alternatives analysis will investigate improvement scenarios to ensure the most appropriate design recommendations. Three multiple alternatives will be evaluated and may include the following:
Phase 3 – Flood Hazard Area Delineation
The FHAD identifies floodplain limits, water surface elevation profiles for the 10-. 50-, 100- and 500-year storm event. As a part of the FHAD, the 500-year existing conditions hydrology will be developed based on the information from the Baseline Hydrology Report. The FHAD Report will include flood maps, flood profiles and floodplain/floodway data tables (if applicable). Components from the Baseline Hydrology Report will be included in the FHAD.
Phase 4 – Conceptual Design Report
A conceptual design will be done for the recommended plan from the alternatives evaluation. The recommended plan will be selected based on a number of factors including cost, benefit, risk, constructability and feasibility.
Phase 1 - Baseline Hydrology Report
The baseline hydrology is the development of detailed and accurate hydrology to quantify the peak stormwater flows associated with different return frequency storm events. The hydrology will be evaluated for the 2-, 5-, 10-, 25-, 50- and 100-year return period storm events for existing land uses. The Niver Creek watershed is a primarily fully developed watershed with minimal changes anticipated for zoning and land use changes, thus the project sponsors have determined that the existing conditions hydrology will be the same as the future conditions hydrology. Only the future conditions hydrology will be produced for this report. The baseline hydrology results will identify the extent of surface flooding and identify problem areas.
Phase 2 – Alternatives Analysis
The alternatives analysis will investigate improvement scenarios to ensure the most appropriate design recommendations. Three multiple alternatives will be evaluated and may include the following:
- Improve timing of peak flows along tributaries to reduce peak flows downstream
- Maximize detention opportunities
- Improvement of infrastructure sizing and capacity
- Enhance trail connectivity
Phase 3 – Flood Hazard Area Delineation
The FHAD identifies floodplain limits, water surface elevation profiles for the 10-. 50-, 100- and 500-year storm event. As a part of the FHAD, the 500-year existing conditions hydrology will be developed based on the information from the Baseline Hydrology Report. The FHAD Report will include flood maps, flood profiles and floodplain/floodway data tables (if applicable). Components from the Baseline Hydrology Report will be included in the FHAD.
Phase 4 – Conceptual Design Report
A conceptual design will be done for the recommended plan from the alternatives evaluation. The recommended plan will be selected based on a number of factors including cost, benefit, risk, constructability and feasibility.
available documents
Documents will be available to the public once they are accepted by the project sponsors.
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Report
Final Baseline Hydrology Report
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Date of Completion
April 2015
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Downloadable PDF
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Final Alternatives Report
Final Conceptual Design Report
Final FHAD
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October 2015
December 2016
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