Stormwater - Lennon, Smith, Souleret Engineering, Inc.

LSSE provides planning, design, and construction phase services for stormwater collection and conveyance infrastructure attendant with main–street municipal, residential, commercial, and greenfield site development projects. Experience includes flood damage assessment and remediation design; hydrologic/hydraulic modeling and flood mitigation studies; flood control dam dredging and stream restoration projects; flood protection levee and pumping; and, localized flood mitigation projects. LSSE designs began to incorporate green stormwater infrastructure, before GSI was mandated in regional urban site redevelopment projects, and LSSE designed some of the first development projects that incorporated a full range of stormwater Best Management Practices (BMP), including porous pavement, rain gardens, bio-retention facilities, grassed swales, fens, etc. LSSE stormwater experts have developed and applied widely accepted regulatory (Municipal Separate Storm Sewer – MS4) compliance protocols. These include state of the art GIS mapping and database management programs, which are instrumented via fixed–base computer infrastructure and portable devices. LSSE Principals and stormwater experts have teamed with regulatory representatives and regional Conservation Districts in the delivery of MS4 education/training presentations throughout western Pennsylvania.

Facilities Planning, Design, Construction Phase, and Surveying Services:

Stormwater Collection and Conveyance
Retention, Equalization (CSO) facilities
Pumping
Erosion and Sedimentation Protection
Stream Restoration
Streambank Protection
Wetland Mitigation
BMPs
- Grassed swales
- Fens
- Bio-Retention Ponds
- Rain Gardens
Green Stormwater Infrastructure
- Porous Pavement
- Infiltration Drains
- Specialized Studies/Investigations

Post Construction Stormwater Management Plans

Hydraulic and Hydrologic Modeling
Stormwater Utility Studies
Permitting (NPDES, Chapter 104/105 and General Permits)
Flood Damage Assessment
PEMA/FEMA Compliance Documentation
Letter of Map Revision ( LOMR)
GIS-Driven MS4 Management Programs
Wetland and Stream Delineations

Recent Project Highlights

3RWW Green Stormwater Infrastructure Feasibility Study

As part of its role on the 3 Rivers Wet Weather (3RWW) Program Management Team and subsequent to the 3RWW Green Infrastructure Pilot Project. LSSE provided engineering planning services and lead technical assistance for the ALCOSAN Source Control Study to develop a process to identify site locations for installation of Green Stormwater Infrastructure (GSI) in […]

Flood Protection Project Parsons, Tucker County, West Virginia

The primary objective of the engineering study was to identify improvements necessary to provide flood protection for the Kingsford Manufacturing facility to the plant from a 100-year storm and determine upstream and downstream water surface evaluation impacts caused by proposed improvements using hydraulic modeling (HEC-RAS) to establish levee top elevations and, upstream and downstream water […]

Municipal Separate Storm Sewer Systems (MS4s)

LSSE is currently the Municipal, Borough or Township Engineer for twenty municipalities that have a PADEP Municipal Separate Storm Sewer System (MS4), National Pollution Discharge Elimination System (NPDES) permit. LSSE has facilitated the development and implementation of a community-specific MS4 program to meet the requirements set forth under the NPDES permit. LSSE’s implementation of the […]