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B. Hydr9logy and Hydraulics
Flood hazard information is presented within this publication for the lOO-Year
and Standard Project Floods (SPF) for each of the ten studied stream systems.
Standard SCS study methods were utilized in the hydrologic analyses of the
watersheds. The following fundamental procedures were used in completing all
ten stream systems.
Manning's "nil values were determined through field investigations of the
physical conditions of the stream channels and floodways. Bridge flow
characteristics were studied on-site. Engineering field surveys were conducted
at all bridges and at numerous valley cross sections along each stream.
Current land use and treatment practices were studied.throughout the watershed.
These data were used in conjunction with soils survey information to select
runoff curve numbers which describe rainfall-runoff relationships. Watershed
slope, reach lengths and drainage areas were measured from U.S. Geological
Survey (USGS) 7 1/2 minute quadrangle topographic maps. Individual stream
system watershed boundaries were obtained from the USGS District office in
Indianapolis. Interior drainage divides were obtained from the topographic
maps and checked with drainage maps provided by the Allen County Surveyor.
Time of concentration for each local drainage area was computed from an
analysis of watershed relief and travel length. Fifteen water surface profiles
were computed for each stream system using standard SCS procedures. Results
included elevation-discharge relationships at each designated section. Input
data included: bridge and valley cross section coordinate data; bridge opening
orifice and road weir flow coefficients; Manning's "n" value for each
segment of the valley sections; a starting flow rate for each profile; size
of drainage area; and representative'reach lengths.
13
Object Description
| Title | Flood hazard analyses: selected streams Allen County, Indiana |
| Creator | United States. Soil Conservation Service |
| Topic | Floodplain, Floods |
| Subject |
Floods--Indiana--Allen County Flood damage prevention--Indiana--Allen County |
| Geographical Coverage | Allen County, Indiana |
| Date of Original | November 1974 |
| Time Period | 1900-1999 |
| Source | Print version: United States. Soil Conservation Service. Flood hazard analyses: selected streams Allen County, Indiana. (Indianapolis, Ind.: United States Department of Agriculture Soil Conservation Service, 1974), 1 v. |
| Additional Availability | Print version might be available at IPFW Helmke Library. See online catalog. |
| Rights | Copyright Indiana University-Purdue University Fort Wayne, 2006- . All rights reserved. May not be reproduced without permission. For information regarding reproduction and use see: http://cdm16776.contentdm.oclc.org/cdm/about/collection/p16776coll1/ |
| Date Digitally Created | April 17 2012 |
| Digital Publisher | Walter E. Helmke Library, Indiana University-Purdue University Fort Wayne |
| Digitization Specifications | Missing: Table 1, sheet 3 of 3; Plate 3, sheet 2 of 8, 8 of 8; System 1: exhibit B, sheets 1-4 of 4; exhibit C, sheet 1 of 3; System 2: exhibit B, sheets 1-6 of 6, exhibit C, sheets 1-2 of 3; System 3: exhibit B, sheets 1-4 of 4; System 4: exhibit B, sheets 1-4 of 4; System 5: exhibit B, sheets 1-2 of 2, exhibit C, sheet 1 of 1; System 6: exhibit B, sheets 1-2 of 2; System 7: exhibit B, sheets 1-5 of 5, exhibit C, sheet 1 of 3; System 8: exhibit B, sheets 1-2 of 2; System 9: exhibit B, sheets 1-2 of 2; System 10: exhibit A; exhibit B, sheets 1-8 of 8; exhibit C, sheet 3 of 6. This pdf file was derived from black and white, 400 dpi, 1-bit; grayscale 300 dpi, 8-bit; and color 300 dpi, 24-bit uncompressed TIFF images that were scanned from the originals using a Fujitsu 5750C scanner with Adobe Acrobat 8.0 Professional scanning software. |
| Content Type | Text |
| Digital Format | text/pdf |
| Collection | Fort Wayne Area Government Information |
| Identifier | 30000122011855 |
| File Name | 30000122011855.pdf |
Description
| Title | Page 20 |
| Transcript | B. Hydr9logy and Hydraulics Flood hazard information is presented within this publication for the lOO-Year and Standard Project Floods (SPF) for each of the ten studied stream systems. Standard SCS study methods were utilized in the hydrologic analyses of the watersheds. The following fundamental procedures were used in completing all ten stream systems. Manning's "nil values were determined through field investigations of the physical conditions of the stream channels and floodways. Bridge flow characteristics were studied on-site. Engineering field surveys were conducted at all bridges and at numerous valley cross sections along each stream. Current land use and treatment practices were studied.throughout the watershed. These data were used in conjunction with soils survey information to select runoff curve numbers which describe rainfall-runoff relationships. Watershed slope, reach lengths and drainage areas were measured from U.S. Geological Survey (USGS) 7 1/2 minute quadrangle topographic maps. Individual stream system watershed boundaries were obtained from the USGS District office in Indianapolis. Interior drainage divides were obtained from the topographic maps and checked with drainage maps provided by the Allen County Surveyor. Time of concentration for each local drainage area was computed from an analysis of watershed relief and travel length. Fifteen water surface profiles were computed for each stream system using standard SCS procedures. Results included elevation-discharge relationships at each designated section. Input data included: bridge and valley cross section coordinate data; bridge opening orifice and road weir flow coefficients; Manning's "n" value for each segment of the valley sections; a starting flow rate for each profile; size of drainage area; and representative'reach lengths. 13 |
