March 7, 2022

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Ranjita Tiwari and Matthew Bardol to Present at the Illinois Association of State Floodplain and Stormwater Management Conference

Ranjita Tiwari and Matthew Bardol, P.E., CFM, CPESC, D.WRE (Illinois) will present at the Annual Conference of the Illinois Association of State Floodplain and Stormwater Management at the Bloomington-Normal Marriott in Normal, Illinois, held March 8 and 9, 2022. Geosyntec is a Bronze Sponsor of the event.

Ranjita Tiwari is a Senior Staff Water Resources Professional who focuses on hydrologic and hydraulic modeling, stormwater management, best management practice design, and sediment and erosion control design. She is well versed in industry-specific tools such as HEC-RAS, HEC-HMS, ArcGIS, EPA SWMM, and AutoCAD. Ranjita's presentation is titled "Cascading Dam Breach Analysis." She will present at 1:30 p.m. CST on March 9.

Matthew Bardol is a Senior Principal Engineer with more than 20 years of environmental and water resource engineering experience. Drawing upon his experience as a military engineer and program manager of major stormwater infrastructure projects, in addition to his academic training, Matt offers a breadth of technical expertise to address the most complex water resource situations with innovative solutions. Matt helps clients design and construct traditional and green infrastructures. His specialties include dams and levees, urban stormwater and sewer systems, stream stabilization, bridge scour protection, dam breach studies, and flood hazard mapping. Matt's presentation is titled, "2022 Update: MWRD Stormwater Master Planning for Resilient Communities." He will present at 3:20 p.m. CST on March 8.

The IAFSM holds its annual conference each spring. The conference provides an opportunity for professionals in private industry, municipal governments, and state and federal agencies to communicate and share ideas.

A local chapter of the Association of State Floodplain Managers, the IAFSM promotes the common interest in floodplain and stormwater management, enhances cooperation among local, state, and federal agencies, and encourages effective and innovative approaches to managing the floodplain and stormwater systems of Illinois.


Cascading Dam Breach Analysis
Ranjita Tiwari
Recent dam breaches such as Edenville (MI) and Oroville (CA) have highlighted the need to understanding the impacts of cascading dam breaches on downstream areas. This presentation will focus on a case study of cascading breach analysis for three dams (Dams 1, 2, and 3) in series. The analysis was completed using the Hydrologic Engineering Centre—River Analysis System (HEC-RAS) 2D model. In addition to the three dams, twelve crossings downstream of Dam 1 were analyzed. In the hydraulic model, all downstream dams, bridges and culverts are set to breach when overtopped by two feet. A simulated breach of Dam 1 results in cascading breach of Dam 2 and 10 crossings downstream of Dam 1. Potential breach of Dam 1 would result in more than 70 structures being inundated.

2022 Update: MWRD Stormwater Master Planning for Resilient Communities
Matthew Bardol
This presentation provides an update to the Metropolitan Water Reclamation District of Greater Chicago's (MWRD's) efforts to develop a Stormwater Master Plan for Cook County to address stormwater and urban flooding. Although this presentation focuses on Cook County, the approach is relevant throughout Illinois. In addition to providing a progress update, the presentation will present the GIS stormwater data that will be available to municipal staff and engineers via an online GIS portal. The data can be used by municipalities and planning agencies to understand where there are areas at risk for urban flooding, prioritize those areas for action, and seek funding opportunities. It will also provide an update and refresher regarding the Stormwater Storage Metrics as a planning tool. The Storage Metrics are a numerical quantification of the total, cumulative flood mitigation needs calculated at the catchment level and aggregated at the municipal level. These can also be used by a municipality when forming partnerships with other agencies, to estimate ballpark capital improvement costs to address urban flooding, and to prioritize areas in need of flood mitigation. 

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For consultation regarding water and natural resources, contact Ranjita at This email address is being protected from spambots. You need JavaScript enabled to view it. or Matt Bardol at This email address is being protected from spambots. You need JavaScript enabled to view it. .
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