Text · page 78 of 359
Read the whole document on one page (all 359 pages, each with its own heading)
West Seneca Sewer Report | Page 6 2-MH 60” RCP @ 0.042% BAA9A 0.016 11.972** 0.067 12.039 34.6 Y (Casimer Street) 3-MH 66” RCP @ 0.026% BAAA8 0.016 11.615*** 0.067 11.682 35.1 Y (8 Cable Street) Notes: *Peak Dry Weekend Day for Nodes 1 on Aug 25,2024 **Peak Dry Weekend Day for Node 2 on Sept 14,2024 ***Peak Dry Weekend Day for Node 3 on Sept 14,2024 3.5 DSCA CONCLUSION Based on the analysis and flow monitoring results the flow depth peak increases are described below. The combined sewer has sufficient capacity to handle projected peak flows. • Node 1 projected peak 0.067 MGD flow (0.10 CFS) result in approximately a 1.6 inch water level increase within the 48” RCP sewer. • Node 2 projected peak 0.067 MGD flow (0.10 CFS) result in approximately 2.6 inch water level increase within the 60” RCP sewer. • Node 3 projected peak 0.067 MGD flow (0.10 CFS) result in approximately 2.9 inch water level increase within the 66” RCP sewer. Full sewer calculations including – TECsmith Flow Monitoring Data, TECsmith Time Tables, Eire County Flow Monitoring and Erie County Time Tables are included in the Full Sewer Report which was previously provided to the town as a part of the Special Use Permit review process. Section 4 – Proposed Stormwater Facilities 4.1 Proposed Stormwater Loading A Stormwater Pollution Prevention Plan (SWPPP) has been developed as part of this project and is included under a separate cover. The proposed on-site storm system will outlet to Cayuga Creek. The stormwater design meets the Town of West Seneca Town Code (2025- 09-08) - Chapter 102A Stormwater Management and Erosion and Sediment Control and the NYSDEC 2024 Stormwater Design Manual Regulations. However, pertinent information pertaining to existing and proposed stormwater loading has been included for analysis in the table below. 4.2 Required WQv Stormwater runoff from impervious surfaces is recognized as a significant contributor of pollution that can adversely affect the quality of receiving water bodies. Therefore, treatment of stormwater runoff is important since most runoff related water quality contaminants are Page 78 of 359