My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
FLOOD00268
CWCB
>
Floodplain Documents
>
Backfile
>
1-1000
>
FLOOD00268
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
1/29/2010 10:11:44 AM
Creation date
10/4/2006 9:10:35 PM
Metadata
Fields
Template:
Floodplain Documents
County
Jefferson
Denver
Community
Lakewood, Denver
Stream Name
Dry Gulch
Title
Flood Hazard Area Delineation - Dry Gulch and Tributaries
Date
11/1/1977
Prepared For
Denver / Lakewood
Prepared By
UDFCD
Floodplain - Doc Type
Floodplain Report/Masterplan
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
50
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />7 <br /> <br />of hydrologic computation" were selected for use in t.he Colorado <br /> <br />Urban Hydrograph Procedure (CUHP) as developed in Reference 1. <br /> <br /> <br />The CUHP was then used to compute hydrographs of the predicted <br /> <br /> <br />5-, lO-, 50-, and 100-year floods at each point. Table 2 pre- <br /> <br /> <br />sents the basin parameters and the computed peak flood flows. <br /> <br /> <br />The parameters in Table 2 represent each sub-basin or combination <br /> <br /> <br />of sub-basins, as indicated by the notes. Where two peak flood <br /> <br /> <br />flows are tabulated, the first is the flow computed from the <br /> <br /> <br />tabulated parameters; the second is the peak flow in the channel <br /> <br /> <br />determined by cOmbining the computed flow with flows from other <br /> <br /> <br />sub-basins. <br /> <br />Samples of the computed hydrographs are shown in Figures land <br /> <br /> <br />2. Figure 1 illustrates hydrographs computed along Dry Gulch <br /> <br /> <br />at various locations, showing the increase in time to the peak <br /> <br /> <br />flow as the flood moves downstream. Figure 2 shows the hydro- <br /> <br /> <br />graphs on Dry and North Dry Gulches at their confluence at Harlan <br /> <br /> <br />Street The hydro graphs are combined to form the composite hydro- <br /> <br /> <br />graph of flow downstream from the confluence. Also shown is <br /> <br /> <br />a single computed hydrograph at point D-16, which results .1:: <br /> <br /> <br />a peak flow almost identical to that of the combined hydrographs. <br /> <br /> <br />This is justification for computing flows east of Harlan Street <br /> <br /> <br />by representing the entire tributary basin by a single set of <br /> <br /> <br />parameters. <br /> <br />verges again. Because of these characteristics, the hydrology <br /> <br /> <br />and hydraulics of the study are inter-related. Preliminary <br /> <br /> <br />hydrologic computations were performed, and then flood profiles <br />were determined as described in the following section. The water <br />surface data revealed the locations at which flow splits occurred, <br />and it then became necessary to estimate the flow rates of the <br />separated flow so that the hydrology could be revised. The new <br />flow rates were then used in the backwater computations, and <br />the new water surface elevations in some cases indicated a need <br /> <br /> <br />for further revision of the hydrology. The completion of this <br /> <br /> <br />iterative process is presented in Figures 3 and 4, which illus- <br /> <br /> <br />trate the inter-relationship between the flows in the three channels <br /> <br /> <br />involved in the study. Presented in the following paragraphs are <br /> <br /> <br />generAl descriptions of the flow splits and routes. <br /> <br />The main channel of Dry Gulch begins near Simms Street and <br /> <br /> <br />Colfax, with flow reaching that intersection from the west and <br /> <br /> <br />north. A planned storm sewer running southerly on Simms to <br /> <br /> <br />Lakewood Gulch will divert a significant portion of the Dry <br /> <br /> <br />Gulch flow out of its basin. Since the storm sewer is under <br /> <br /> <br />contract at the writing of this report, it is regarded as an <br /> <br /> <br />existing facility and the flow in Dry Gulch is reduced by the <br /> <br /> <br />amount of this diversion. The resulting Dry Gulch flow is con- <br /> <br /> <br />sequently quite small at the upstream end of the basin. <br /> <br />The study area lS characterized by several points at which flow <br /> <br />diverges, traverses distinctly different routes, and then con- <br />
The URL can be used to link to this page
Your browser does not support the video tag.