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CC - Agendas - City Council - REGULAR - 10/23/2012
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CC - Agendas - City Council - REGULAR - 10/23/2012
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1/15/2020 11:47:56 AM
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CC - Agendas
Department
City Clerk
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Clerk Records
Content
Agendas
Committee Status
Current
Document Type
City Council
Meeting Type
REGULAR
Meeting Date
10/23/2012
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Permanent
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Permanent
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11/13/2018
Record Series
GS1016, #10260
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2779105
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1.2 Survey and Mapping <br /> 1.2.1 Field Survey <br /> The Project Team shall perform the following survey services: <br /> • Survey of channel section at waterline crossing to get current condition of the scour hole. <br /> • Survey of miscellaneous features identified through field reconnaissance and data collection. <br /> • Survey the main channel, and 200 feet beyond the channel banks, for HEC-RAS River <br /> Stations 1.8826 through 2.1416(9 total). <br /> • Supplemental survey for Clearwater Drive at Willow Creek. <br /> • Survey of culvert crossing at Clearwater Drive and Willow Creek Tributary <br /> • Sealed Survey report. <br /> KWE,as a subcontractor to JEF,will conduct the Field Survey. A detailed scope of services is <br /> included as Exhibit 1. <br /> 1.2.2 Topographic Mapping <br /> The hydraulic and floodplain studies will utilize the existing 1 foot topographic mapping and <br /> aerials prepared in(2010) under the Willow Creek Floodplain Delineation Study(FDS)project. <br /> 1.3 Public Involvement <br /> The Consultant shall meet,up to three(3)times with the City and local stake holders regarding the flood <br /> inundation limits determined as part of Tasks 1.4 and 1.5. The Consultant shall prepare up to three(3) <br /> 24"x36"exhibits for each of the meetings. <br /> 1.4 Willow Creek Levee Floodplain Evaluation based on FEMA's Levee Analysis and Mapping <br /> Project(LAMP) Guidelines <br /> JEF shall perform up to three(3)hydraulic modeling scenarios, using as a basis for model development, <br /> the HEC-RAS hydraulic analyses for Willow Creek- Willow Creek Road to Williamson Valley Road, <br /> prepared by JEF as part of Floodplain Delineation Study for a Portion of Willow Creek dated June 2011. <br /> In addition,hydraulic modeling scenarios will be conducted in accordance with the Draft Federal <br /> Emergency Management Agency(FEMA) LAMP Guidelines. Hydraulic modeling will be based on the <br /> 100-and 500-year peak discharge(s), determined by Arroyo Engineering(Effective FEMA discharges). <br /> HEC-RAS hydraulic analyses and floodplain modeling results will be reviewed and approved by the City. <br /> JEF will coordinate with FEMA throughout the mapping process. <br /> 1.5 Willow Creek Levee Floodplain Revisions,and FEMA Submittal <br /> Based on the three(3)hydraulic modeling scenarios developed under Task 1.4, a Preferred Alternative <br /> will be selected.The Preferred Alternative will be refined based on more detailed HEC-RAS modeling. <br /> Modeling results will be used for final Willow Creek Levee flood hazard delineation. The detailed <br /> modeling and delineated flood hazard will be documented in an update to the Floodplain Delineation <br /> Study for a Portion of Willow Creek Technical Support Data Notebook(TSDN). Tasks for completing the <br /> Willow Creek Levee floodplain revision and submittal to FEMA are discussed below. <br /> 1.5.1 Hydraulic Modeling <br /> The Project Team shall conduct detailed HEC-RAS hydraulic analysis for the interior areas of <br /> Willow Creek Levee, upstream of Willow Creek Road. HEC-RAS modeling and results will be <br /> documented in the updated TSDN. Detailed hydraulic modeling will be based on the 10-,25-, 50-, <br /> 100- and 500-year peak discharges. All hydraulic modeling will be based on revised hydrology <br /> prepared by Arroyo Engineering and obtained from City. HEC-RAS hydraulic analyses shall be in <br /> accordance with FEMA standards. HEC-RAS hydraulic model results shall be used for revision of <br /> the effective FEMA Flood Insurance Study(FIS). <br /> October 8,2012 <br /> Willow Creek and Willow Creek Tributary Restudy Page 2 of 6 <br />
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