Post on 26-Apr-2018
transcript
Andy Martin, PE
James Kerrigan, PE
Need for the project Wet weather CSOs into White River
Federal Consent Decree
LTCP to reduce the CSO volume by 83% and CSO frequency to 8/yr based on typical year rainfall
Alternative Analysis CSO Storage Basin
In line Storage using Inflatable dam
In Line Storage using Weir Wall with Orifice
CSO Storage Basin Larger footprint
Does not enable the use of existing infrastructure
Cost - $ 5.2/gal based on the EPA cost curves for open storage basins
Inflatable Dam Enables the use of existing infrastructure
Requires external power source
Requires security alarm – Inflatable Dam Installation in remote location
Requires control system and telemetry
Requires maintenance
Failure results in overflow event
Cost - $ 1.2/gal
Inflatable Dam
Weir Wall With Orifice
Weir Wall With Orifice
Weir Wall With Orifice Enables the use of existing infrastructure
It is a passive device
Doesn’t require external power source
Needs no maintenance
Cost - $ 0.8/gal
Sewer Location Map
ISD2
ISD1
Existing Condition of the Sewer
108” Relief Sewer Max Flow Depth for Storm Events
Profile of the Relief Sewer
Site Plan for Construction – ISD 1
Site Plan for Construction – ISD2
Working Model of In-Line Storage
CSO Reduction CSO volume reduced from 84 MG to 24 MG (70%)
CSO frequency reduced from 43 to 8 times per year (81%)
Questions?