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A detailed hydraulic analysis of Idle Hour Wash for the purpose of preparing a Letter of Map Revision.
The objectives of this report are to document the on-site and off-site hydrologic and hydraulic assessment of the site and its characteristics, quantifying existing conditions peak discharges, and define the limits of 100-year on-site floodplains.
The purpose of this study is to provide flood and erosion hazard information for Soldier Canyon Wash for use by the District in floodplain use permitting and and floodplain management.
This study identifies the drainage and flooding hazards within the watershed and develops alternatives to address those hazards. It is a comprehensive study that estimates flood and erosion potential, maps watercourses, identifies existing and potential problems and develops preliminary solutions and standards for sound floodplain and stormwater management.
The objective of this Technical Data Notebook is to provide 100-yr peak discharges at a Concentration Point for the Unnamed 02 and 03 Washes, 100-yr floodplain boundary and erosion hazard information, using the most up-to-date topographic, hydrologic, and hydraulic data. This is a local study and has not been submitted to FEMA.
Mounted black and white photograph with a typescript annotation, "July 17 1914. Making the trip down Bright Angel trail at the Grand Canyon of Arizona on mules. Left to right: George H. N. Luhrs, Jr., unknown, George H. N. Luhrs, Emma Luhrs, Ella Luhrs. Bright Angel Trail to the Colorado River, at bottom on canyon."
Black and white print of the Grand Canyon with a typescript annotation, "July 17, 1914. Grand Canyon Arizona. On the left side you can see some of the mules taking people down the Bright Angel Trail to the bottom of the Canyon."
Black and white print with members of the Luhrs family. Typescript annotation, "July 17th, 1914. Going down Bright Angel Canyon of Arizona, Those on the mules, from bottom up: unknown, unknown, Ella Luhrs, Emma Luhrs, George H. N. Luhrs, unknown, Roger Hunt, George Luhrs Jr., Catherine Margarita 'Gretchen' (Mrs Geo H. N.) Luhrs standing beside George Luhrs Jr." Beside the trail, a sign displays, "Photo by Kolb Brothers."
Black and white print of six men and four women (unidentified) astride mules on a trail. One man sits on rocks beside the trail.