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W.J. Schneider

Publications and source records attributed to W.J. Schneider.

9 recordsLinked to original sources
USGS1972

Map showing flood of June 1972 resulting from tropical storm Agnes, Genesee River at Avon, New York

In June 1972, tropical storm Agnes caused severe flooding in Pennsylvania and southern New York. The floods on many major streams were the highest known since the river valleys were settled. Maximum discharges were as much as twice the discharge of a 50-year flood. In southern New York, large areas in Corning, Elmira, Wellsville, Salamanca, and in many smaller communities were inundated to depths of sever a feet. Levels of all of the Finger Lakes were higher than any previously recorded, and extensive flooding of lakeside properties resulted. The extent of flooding shown on the map was delineated by the U.S. Geological Survey from aerial photography and limited field surveys.

New York↗
USGS1972

Flood of June 1972: Genesee River near Mount Morris, New York

In June 1972, tropical storm Agnes caused severe flooding in Pennsylvania and southern New York. The floods on many major streams were the highest known since the river valleys were sattied. Maximum discharges were as much as twice the discharge of a 50-year flood. In southern New York, large areas in Corning, Bimire, Wallsville, Salamanca, and in many smaller communities were immersed to depths of several feet. Levels of all of the Finger Lakes were higher than any previously recorded, and extensive flooding of lakeside properties resulted. The extent of flooding shown on the map was delineated by the U.S. Geological Survey from serial photography and limited field surveys. The investigation was conducted in cooperation with the State of New York and the U.S. Army Corps of Engineers.

New York↗
USGS1972

Flood of June 1972: Genesee River at Portageville, New York

In June 1972, tropical storm Agnes caused sever flooding in Pennsylvania and southern New York. The flood, on many major streams were the highest known since the river valleys were settled. Maximum discharges were as much as twice the discharge of a 50-year flood. In southern New York, large areas in Corning, Elmire, Wellsville, Salamanca, and in many smaller communities were inundated to depths of several feet. Levels of all of the Finger Lakes were higher than any previously recorded, and extensive flooding of lakeside properties resulted. The extent of flooding shown on the map was delineated by the U.S. Geological Survey from earlier photography and limited field survey. The investigation was conducted in cooperation with the State of New York and the U.S. Army Corps of Engineers.

New York↗
USGS1962

Portrayal of drainage and vegetation on topographic maps

Accurate measurements of drainage networks are necessary for studies in many scientific disciplines, especially hydrology. To this end, topographic maps must show accurate classification as well as a consistent pattern of the stream network. A recent study in Georgia has developed two photo-interpretive keys which permit accurate drainage classification during the normal stereo-compilation procedures in map-making. The study was made in the Tired Creek basin in the Coastal Plain, and in the Yellow River basin in the Piedmont Province. In the Tired Creek basin, the perennial stream channels were associated with blackgum swamps which showed as a characteristic pattern on the aerial photographs of the area. Although the areas were classed as evergreen forest on specially-compiled vegetation maps without field checking, the classification was relatively consistent, indicating that the perennial channels could be identified accurately within the basin. In the Yellow River basin origins of perennial flow were found in valleys having concave-upward profiles. Valleys with convex-upward profiles remained ephemeral up to their juncture with a larger stream. Field checks indicated better than 80 percent accuracy in delineating these points of origin of perennial flow through stereoscopic viewing of the aerial photographs of the area. Vegetative difference above and below the origins of perennial flow were to subtle to be readily discerned on the photographs. Errors in classifying vegetation on special maps were attributed mainly to inexperience and to faulty criteria for for classification. Proposals are presented to improve portrayal of both drainage and vegetation on topographic maps. The proposed drainage criteria suggest portrayal of all perennial streams as well as ephemeral drainage below the first branching. The proposed vegetation criteria suggest classification of forest and shrubs, with further sub-division of distinctive patterns of vegetation easily recognized on the aerial photographs.

Open-File Report↗