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CARSON WATER SUBCONSERVANCY DISTRICT COOPERATING TECHNICAL PARTNERS RISK MAP PROJECT MAPPING ACTIVITY STATEMENT Mapping Activity Statement No. 5 The Risk MAP Project described in this Mapping Activity Statement (MAS) dated August 11, 2014, shall be completed in accordance with the Cooperating Technical Partners (CTP) Partnership Agreement dated June 6, 2005 between Carson Water Subconservancy District (herein referred to as “CWSD”) and the Federal Emergency Management Agency (FEMA). Contents SECTION 1—OBJECTIVE AND SCOPE ................................................................................ 2 Project Management ................................................................................................................... 2 Risk Identification and Mitigation .............................................................................................. 3 Community Engagement and Project Outreach .......................................................................... 5 Develop Non-Regulatory Products ............................................................................................. 6 Develop Topographic Data ......................................................................................................... 6 Prepare Base Map ....................................................................................................................... 7 Develop Hydrologic Data ........................................................................................................... 8 Develop Hydraulic Data ............................................................................................................. 9 Perform Floodplain Mapping .................................................................................................... 10 Develop FIRM Database .......................................................................................................... 11 Restudy and Remapping Projects ............................................................................................. 11 SECTION 2—Technical and Administrative Support Data Submittal .................................... 13 SECTION 4—FUNDING/LEVERAGE ( CWSD/Community) .............................................. 13 SECTION 5—STANDARDS................................................................................................... 14 SECTION 6— SCHEDULE ..................................................................................................... 15 SECTION 7—CERTIFICATIONS .......................................................................................... 15 SECTION 8—TECHNICAL ASSISTANCE AND RESOURCES ......................................... 16 SECTION 9—CONTRACTORS ............................................................................................. 16 SECTION 10—REPORTING .................................................................................................. 16 SECTION 11—PROJECT COORDINATION ........................................................................ 17 SECTION 12—POINTS OF CONTACT ................................................................................. 17 Fiscal Year 2014 Mapping Activity Statement No. 5 1 of 18 SECTION 1—OBJECTIVE AND SCOPE The objective of the various Risk MAP Projects documented in this MAS application is to develop and/or support flood hazard data and program related activities for Carson River Watershed by completing technical risk analysis and mapping activities. These activities may result in an updated Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for one or more communities within the project area. In 2012, CWSD and the various counties located in the Carson River Watershed completed a Risk MAP Discovery Report. The Discovery Report identified projects that would enhance or protect the various communities in the watershed from flood related events. The objective of the Risk MAP Project documented in this MAS #5 is to address selected projects identified in the Discovery Report. The projects selected in this application were based on input provided at the April 29, 2014, Risk MAP Charter Meeting. Included in the MAS # 5 application is a request to do two flood risk identification and mitigation evaluation, a public outreach flood awareness program, develop inundation flood maps for the upper and middle Carson River, and conduct two restudy and remapping projects. Each of these projects will be described in more detail below. The following is a list of projects included in this MAS: • Douglas County Smelter Creek Identification and Mitigation Project • Churchill County Water Shunt Identification and Mitigation Project • Public Outreach Flood Awareness Program • Inundation Flood Maps Upper Carson River Watershed Non-Regulatory Product • Douglas County Alpine View Estates Restudy and Remapping Project • Carson City Restudy and Remapping - Eagle Valley Golf Course A & B Project Management Responsible Mapping Partner: CWSD Scope: Project Management is the active process of planning, organizing, and managing resources toward the successful accomplishment of pre-defined project goals and objectives. The CWSD will coordinate with the FEMA Regional Office with respect to Project Management activities and technical mapping activities. Progress reports will be submitted on a quarterly basis in accordance with the financial reporting submittals. CWSD shall refer to 44 CFR 13.4 to obtain minimum requirements for status reporting. The Project Officer, as needed, may request additional information on status. CWSD may meet with FEMA and/or its contractor on a quarterly basis, or more frequently if needed, to review the progress of the project in addition to the quarterly financial and status submittals. Unless requested by FEMA’s Regional Office or CWSD for a meeting, the updates will be conducted over the phone. Fiscal Year 2014 Mapping Activity Statement No. 5 2 of 18 Standards: All Project Management work shall be performed in accordance with the standards specified in Section 5 - Standards. Deliverables: • Monthly Earned Value data reporting through the MIP with variance explanations to support management of technical mapping activities within specified timeframe, for both Regulatory and Non-Regulatory Products; • CWSD will submit quarterly financial and status summaries. Risk Identification and Mitigation Douglas County Smelter Creek Identification and Mitigation Project: Responsible Partners: CWSD Scope: Smelter Creek is an ephemeral stream flowing out of the Pinenuts Range through the Ruhenstroth development in Douglas County, Nevada. From previous work conducted for Smelter Creek, two sites were identified where a small embankment could be constructed to provide detention storage and peak attenuation. Constructing such a structure would result in a significant number of residential structures being removed from the Zone A (undefined BFE) and Zone AE SFHAs. The proposed project will consist of technical review of the hydrology of the watershed (the effective hydrology is from the 1976 NRCS study) using HEC-HMS. Each proposed pond location would be modeled using HEC-HMS to get an appropriate size for the outlet works, and then the outflow hydrographs would be used to study the impact of each of the two potential locations on the downstream hydraulics. New aerial topography would be obtained for the area. A HEC-RAS model would be constructed using data from the new topography to study the impact of the proposed ponds. By updating the 1976 study and remapping Smelter Creek, this project will provide up-to-date, accurate data for Douglas County to determine current flood risk as well as detention basin size, location, and conduct a preliminary cost to benefit ratio analysis. Standards: All floodplain mapping work shall be performed in accordance with the standards specified in Section 5 – Standards. Deliverables: CWSD will provide the Smelter Creek topographic and hydrologic data in accordance with FEMA’s Risk MAP Guidelines & Standards. CWSD shall make the following products available to FEMA by uploading the digital data to the MIP in accordance with the schedule outlined in Section 6 – Schedule. Churchill County Water Identification and Mitigation Project: Responsible Partners: CWSD Fiscal Year 2014 Mapping Activity Statement No. 5 3 of 18 Scope: The City of Fallon, Nevada is located downstream from Lahontan Reservoir. When Lahontan Reservoir is at or near capacity and a significant hydrologic event occurs in the watershed that drains to the reservoir, required releases from Lahontan Reservoir can produce flooding. Such events have happened and require substantial investment of resource to mitigate flooding in Fallon. Therefore, there is a need to determine alternatives to reduce the likelihood of flooding of Fallon, Nevada. Churchill County is considering a study to determine the potential diversion of floodwater from the Carson River to Sheckler Reservoir and the degree of mitigation such an alternative would provide. The project would include obtaining topographic data (U.S.G.S. 10- meter DEMs), using that data to create a set of base topographic maps, selecting one or more potential flood routes, and application of one or more hydraulic models to estimate the size of a potential drainage structure Flood Mitigation Action – The City of Fallon and most of Churchill County are located downstream of the Bureau of Reclamation (BOR) Lahontan Dam. The Lahontan Dam and Reservoir are part of the Newlands Project, the largest