My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
Item 4 - PH on MWMC Reg. SDCs
COE
>
City of Eugene
>
Council Agendas 2004
>
CCAgenda-06/14/04Mtg
>
Item 4 - PH on MWMC Reg. SDCs
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
6/9/2010 1:10:03 PM
Creation date
6/10/2004 3:21:26 PM
Metadata
Fields
Template:
City Council
City_Council_Document_Type
Agenda Item Summary
CMO_Meeting_Date
6/14/2004
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
119
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).
View images
View plain text
APPENDIX B <br />Capacity Parameter Allocation Basis <br /> <br />System Capacity Parameters are based on permitting requirements. Facility process <br />components (defined in Appendix A) are allocated to each of the system capacity <br />parameters, as described below. <br /> <br />Collection System Pipelines <br /> <br />This category consists of major gravity sewer pipelines and force mains (pressure lines) that <br />convey flow for the regional wastewater collection system. Since the primary function of the <br />pipelines is to convey flow, the allocation is assigned to either average or peak flow and <br />none to wastewater strength parameters (i.e., BOD and TSS). The majority of the time the <br />conveyance system is carrying average flows. However, the limiting design criteria when <br />sizing pipelines is based on peak flows. <br /> <br />An assessment of the wet season I/I, which is the key driver in determining the peak flows, <br />can be used as a guide in determining the average/peak allocation breakdown. Table B-1 <br />presents the wet season I/I as a percentage of total peak flow for existing capacity, current <br />loading, and future required capacity. <br /> <br />TABLE B-I <br />Design Criteria Basis For Unit Processes Driven By Peak Flow <br /> <br /> Average Wet Weather I/I as a <br /> Flow Wet Weather I/I Total Peak Flow Percentage of Total Peak <br /> (mgd) (mgd) (mgd) Flow, % <br /> <br />Existing capacity 49 126 175 72% <br /> <br />Current loading (current 43.8 220.2 264 83% <br />capacity required) <br /> <br />Projected 2025 loading 59.3 218.7a 277 79% <br />(future capacity required) <br /> <br />Notes: <br />a) Net reduction in total I/I occurs between now and 2025 as a result of I/I reduction efforts by the cities. <br /> <br />The range of wet weather I/I as a percentage of total peak flow for these three scenarios <br />ranges from 72 to 84 percent. The arithmetic average of these three values is 78 percent. <br />Therefore, a reasonable approach is to allocate a quarter to functional use basis, or average <br />flow; and three quarters to the design criteria sizing basis, or peak flow. <br /> <br />· Average Flow - 1/4 <br />· Peak Flow-3/4 <br /> <br /> SEA31003271388(DG).DOC/041040034 <br /> <br /> <br />
The URL can be used to link to this page
Your browser does not support the video tag.