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Technical Letters

ETL 1110-3-506 Engineering and Design Aviation Complex Planning and Design Criteria for Army Unmanned Aircraft Systems UAS – Historical Copy Expired

This ETL provides guidance and criteria for planning and design of runways and ancillary movement areas that support operations of Army wheeled UAS that are presently fielded. CLICK TO DOWNLOAD

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ETL 1110-2-576 Engineering and Design Ice-Affected Stage Frequency

This ETL provides guidance on the development of ice-affected stage frequency (SF) relationships and includes a literature review of advances made in the last two decades, as well as case studies illustrating the various methods.

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ETL 1110-2-575 Engineering and Design Evaluation of I-Walls

This ETL provides updated technical criteria and guidance for evaluation of existing I-walls. General guidance for performing I-wall evaluation is provided along with detailed updates to existing guidance that focus on three I-wall performance items: the flood-side gap that was …Read More

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ETL 1110-2-573 Engineering and Design Construction Cost Estimating Guide for Civil Works – Historical Copy Expired

This engineer technical letter establishes uniform guidance to describe methods, procedures, and formats for the preparation of construction cost estimates and construction contract modification estimates and total project costs.

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ETL 1110-2-571 Guidelines for Landscape Planting and Vegetation Management at Levees, Floodwalls, Embankment, Dams, and Appurtenant Structures

This ETL provides guidelines to assure that landscape planting and vegetation management provide aesthetic and environmental benefits without compromising the reliability of levees, floodwalls, embankment dams, and appurtenant structures. It is important to note that all minimum guidelines presented herein …Read More

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ETL 1110-2-568 Seismic Evalluation Procedures for Existing Civil Works Powerhouses

The purpose of this guidance is to provide an evaluation procedure to be followed to properly assess the seismic performance of existing USACE civil works powerhouses. This evaluation procedure is needed to identify those powerhouse superstructures that may need remediation …Read More

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ETL 1110-2-566 Advanced Reliability Analysis of Fatigue Cracking in Horizontally Framed Miter Gates

A series of navigational locks and dams along the nation’s inland waterways provide the ability to transport large tonnages of materials and goods efficiently over long distances.  These facilities are operated and maintained by the U.S. Army Corps of Engineers …Read More

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ETL 1110-2-565 Foundation Engineering: In-the-Wet Design and Construction of Civil Works Project

This ETL will furnish guidance for the planning, design, and construction of foundations constructed in-the-wet for civil works structures. This document covers foundation types, subgrade preparation methods, test programs, positioning systems, installation techniques, quality control procedures, tolerances, case histories, and …Read More

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