Bryan Esterly, CFA leads standards development for the Infrastructure sector at the Sustainability Accounting Standards Board (SASB). His role includes research and collaboration with industry and investors to drive the standardization of financially material sustainability information in corporate reporting.
OUTWASH PLAINS. The large quantities of water that flowed from the melting ice deposited various kinds of materials, the most important of which is called glacial outwash. Outwash plains made up of outwash deposits are characteristically flat and consist of layers of sand and other fine sediments. till plain is composed of unsorted material (till) of all sizes with much clay, an outwash plain is mainly stratified (layered and sorted) gravel and sand. The till plain has a gently undulating to hilly surface; the outwash is flat or very gently undulating where it is a thin veneer on the underlying till.
The Glossary of Landform and Geologic Terms, maintained by the United States' National Cooperative Soil Survey, defines an alluvial plain as a large assemblage of fluvial landforms (braided streams, terraces, etc.,) that form low gradient, regional ramps along the flanks of mountains and extend great distances from their sources (e.g., High Plains of North America) Use of alluvial plain as a general, informal term for a broad flood plain or a low-gradient delta is explicitly discouraged.