Base Level Engineering - USGS

Base Level Engineering

Region 6 Submittal Guidance

April 2019

Preface

FEMA Region 6 is funding Base Level Engineering (BLE) in watersheds throughout the Region. The investment in producing broad flood hazard information through the Base Level Engineering methodology will provide data in the form of engineering models, floodplain extents and other visualization tools that will assist communities to better determine their flood risk with Estimated Base Flood Elevations (EBFEs).

This guidance document supports effective preparation of Base Level Engineering analysis, including compilation of the minimum deliverables and datasets. The intent of this document is to provide information to all Mapping Partners within the Region that are delivering Base Level Engineering throughout Region 6.

Base Level Engineering data will be released with the use of an interactive mapping platform named the Estimated Base Flood Elevation Viewer (infrm.us/estbfe) where users can interact with datasets, point and click to estimate Base Flood Elevations and download models, spatial data and reports.

This centralized distribution requires a standardized set of deliverables be produced and made available. The guidance document provides overview and insight into the required delivery of Base Level Engineering datasets to allow the data prepared to allow data transfer between Mapping Partners, and delivery of all required information to support broader data sharing with communities through the Estimated Base Flood Elevation Viewer. Following the guidance document will promote the timely release and availability of Base Level Engineering data through the interactive viewer.

This guidance document supports effective and efficient implementation of flood risk analysis and mapping standards codified in the Federal Insurance and Mitigation Administration Policy FP 204-07801.

For more information, please visit the Federal Emergency Management Agency (FEMA) Guidelines and Standards for Flood Risk Analysis and Mapping webpage ( flood-risk-analysis-and-mapping), which explains the policy, related guidance, technical references and other information about the guidelines and standards process.

Document History

Affected Section or Sub-Section

Date

First Tabular Release February 2016

First Narrative Publication

June 2017

Submittal Guidance (Spatial Delivery)

November 2017

Addition of Appendix A November 2017

General Document Update

October 2018

Submittal Guidance (Modeling) Tips and Tricks

Update to Database files ? Hazus Results

January 2019 January 2019 April 2019

Description

BLE database tables prepared to support development of geodatabase template.

Narrative report prepared and tabular guidance previously prepared was expanded upon for use by all active Mapping Partners preparing Base Level Engineering within Region 6.

Updated existing guidance to include additional information to spatial delivery including 2-D BLE delivery. Also included minor updates to folder structure requirements for MIP upload, XS backwater data inclusion and addition of BFE layer for 2-D BLE delivery.

Appendix A was added to the document to provide Mapping Partners information for the preparation of 2-D BLE engineering analysis and spatial datasets.

Updated to reflect February 2018 guidance and standards update including CNMS, Flood Risk Products, Hazus and the new MIP structure. Also includes new procedure for loading to the new EBFE viewer.

Updated guidance to provide outlines and templates to support 2-D model delivery.

Additional guidance based on delivery reviews and troubleshooting.

Update to Spatial Template (Mitigation Layers) to match updates to National Flood Risk Database/Dataset modifications outlined in Flood Risk Database (FRD) Technical Reference, dated February 2018. Updates include:

Remove FRD_Pol_AR Replace with S_Pol_AR Remove S_CenBlk_Ar dataset Replace with S_FRAC_AR dataset Remove L_RA_Results table Renamed XS to XS_1D Renamed BFE to BFE_2D Added L_Source_Cit table (REQUIRED) for all BLE

submittals Section ? Base Level Engineering Data Delivery ?

updated detail Section ? S_AOMI_PT updated detail Section ? S_AOMI_AR updated detail Section ? Tips and Tricks updated detail

Table of Contents

Preface ..............................................................................................................................................................2 Document History .............................................................................................................................................3 Introduction ......................................................................................................................................................6 Base Level Engineering .....................................................................................................................................6 Sharing data publically through the Estimated Base Flood Elevation Viewer .................................................. 6 Ground Elevation Data Requirements ..............................................................................................................7 Setting Up a Base Level Engineering Project in the MIP...................................................................................7 Partner Responsibilities ....................................................................................................................................7

Mapping Partner (PTS or CTP) ......................................................................................................................7 Regional Service Center (RSC).......................................................................................................................7 FEMA ? Region 6 Staff and Regional Program Management Lead (RPML) .................................................. 8 United States Geological Survey (USGS) ? Data and Spatial Studies Team .................................................. 8 Additional Contacts.......................................................................................................................................9 BLE Delivery Workflow....................................................................................................................................10 Base Level Engineering Assessment - Minimum Deliverables........................................................................11 Base Level Engineering Data Delivery.............................................................................................................13 Hydraulic Model Data Delivery .......................................................................................................................14 2-D Model Delivery Packaging ....................................................................................................................15 Spatial Reference Systems..............................................................................................................................17 Null Values ......................................................................................................................................................17 Topology Rules................................................................................................................................................18 HUC8_StatusInfo ............................................................................................................................................. 19 HUC10_ModelInfo ..........................................................................................................................................20 S_Pol_AR .........................................................................................................................................................21 S_HUC_AR ....................................................................................................................................................... 22 SUB-BASINS ..................................................................................................................................................... 23 XS_1D ..............................................................................................................................................................25 BFE_2D ............................................................................................................................................................ 28 WTR_LN ..........................................................................................................................................................30 WTR_AR ..........................................................................................................................................................31 DTL_STUD_LN .................................................................................................................................................32 DTL_STUD_AR .................................................................................................................................................33 FLD_HAZ_AR ...................................................................................................................................................35 TENPCT_FP ...................................................................................................................................................... 38 Lightest purple hue shows area where...........................................................................................................39

BLE_WSE01PCT ...............................................................................................................................................40 BLE_WSE0_2PCT .............................................................................................................................................41 BLE_DEP01PCT ................................................................................................................................................42 BLE_DEP0_2PCT ..............................................................................................................................................43 S_AOMI_PT .....................................................................................................................................................44 S_AOMI_AR ..................................................................................................................................................... 48 S_FRAC_AR...................................................................................................................................................... 51 L_Source_Cit ...................................................................................................................................................54 CNMS Database ..............................................................................................................................................56

1. Add Unmapped Miles into S_Studies_Ln:............................................................................................56 2. BLE Tracking Fields: ............................................................................................................................. 57 3. BEING STUDIED Fields: ........................................................................................................................58 4. Run the CNMS QC tool: .......................................................................................................................59 HAZUS DATASETS............................................................................................................................................63 PRODUCER TIPS & TRICKS...............................................................................................................................64 Hydraulic Model Development...................................................................................................................64 Flood Risk Dataset Preparation & Data Checks ..........................................................................................66

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