RasFlow Studio

About

Why RasFlow Studio exists, and who built it.

The idea

A scalable automation suite for HEC-RAS 2D.

Building a rain-on-grid study usually means stitching GIS prep, mesh setup, plan runs, QA, maps, and reports across tools and folders. Steps get skipped, layers fall out of sync, and hard-won project knowledge lives in someone's notes, not in the model workspace.

RasFlow Studio treats the full study as one automated path. Seven phases, from project setup through reporting, run in guided sequence with validation gates so compute is not wasted on a flawed setup. Automated mode can carry the pipeline forward; manual mode keeps every sub-step under operator control. HEC-RAS stays the engine. The suite keeps domain, terrain, land cover, rainfall, mesh, checks, flood maps, and deliverables aligned, and scales from a single study to multi-plan production workloads.

Founder

Built from field practice, not theory alone.

RasFlow Studio is shaped by applied H&H practice, climate-informed flood analysis, and reproducible modeling standards carried into a scalable automation suite.

Shailendra Singh PhD, PE, CFM

Water Resources Engineer, Geosyntec Consultants

Shailendra is a water resources engineer with more than 12 years of combined professional and research experience in hydrologic and hydraulic (H&H) modeling, climate-informed flood analysis, dam safety, and watershed planning. He applies process-based numerical models and advanced geospatial and statistical methods to quantify how land-use change, extreme precipitation, and climate escalation reshape flood risk, infrastructure performance, and water quality across site, municipal, and regional scales.

His work spans confidential mining clients, municipalities, sewer districts, and regional planning agencies, delivered through 1D/2D HEC-RAS, HEC-HMS, EPA-SWMM, WASP, and SWAT workflows integrated with ArcGIS Pro and Python-based automation. He co-authored ISWS Bulletin 75 (Illinois Precipitation Frequency Study) and contributes to Geosyntec's technical leadership in Rain-on-Grid modeling, PMP/PMF analysis, and reproducible modeling practice.

Experience
12+ years
Focus area
Hydrologic and Hydraulic Modeling

Expertise

  • 1D and 2D HEC-RAS modeling, including large-scale Rain-on-Grid applications
  • Watershed hydrology using HEC-HMS, EPA-SWMM, and SWAT
  • Dam breach, spillway design, and high-hazard dam safety analysis
  • Floodplain modeling, mapping, and no-rise / FEMA / state regulatory support
  • Rainfall frequency analysis, PMP/PMF estimation, and climate escalation (SSP/RCP scenarios)
  • Urban stormwater management, culvert and conveyance design, and stream restoration hydraulics
  • Water quality modeling and NARP support using WASP and SWAT
  • Statistical, geospatial, and Python-based automation of H&H workflows (ArcPy, ras-commander, SALib)

Technical stack

  • HEC-RAS 1D/2D
  • HEC-HMS
  • EPA-SWMM / PC-SWMM
  • StormCAD
  • STORMWISE
  • SWAT / SWAT+
  • DRAINMOD
  • RZWQM
  • ArcGIS Pro / QGIS
  • R programming
  • Python

That practice shapes RasFlow Studio: full automation where it helps, operator control where it matters, and a scalable path from watershed inputs to verified HEC-RAS 2D results and client-ready deliverables.

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