Water Resources Engineering

I provide services in all areas of water resources engineering. My experience includes runoff mitigation, storm and sanitary sewer design, floodplain mapping, dam-break modeling, bridge/culvert hydraulics, scour analysis, 1D/2D river modeling, erosion & sediment control, treatment plants, and pumping stations.


  • Licensed Professional Engineer in GA, DC, PR, USVI
  • Certified Level II Design Professional, Georgia Soil and Water Conservation Commission
  • 8 years of experience in water resources & environmental engineering
  • Over 140 projects completed in 9 states
  • MS in Civil Engineering, University of Illinois at Urbana-Champaign
  • BS in Civil Engineering, University of Puerto Rico at Mayaguez


My work consists of combining fluid mechanics theory with field expertise to solve water problems for residential, municipal, and industrial projects.



  • Detention ponds
  • Storm sewers
  • Site and roadway drainage
  • Flood & irrigation studies
  • Erosion & sediment control
  • GIS storm system mapping
  • Water quality BMPs
  • NPDES Permitting
  • Surface hydrology
  • Groundwater recharge

Rivers and Reservoirs

  • 1D/2D river modeling
  • Bridge and culvert design
  • No-rise certifications
  • Scour and deposition analysis
  • Sediment transport
  • Floodplain and floodway studies
  • Letters of Map Revision (LOMR)
  • Dam-break modeling
  • Fish passage & preservation
  • Stream restoration


  • Sanitary sewers
  • Septic tanks
  • Filtration plants
  • Treatment plants
  • Pumping stations
  • Force mains
  • Intakes
  • Water distribution systems
  • Transmission mains
  • Storage Tanks

Our Team

David S. Ancalle, P.E.

Water Resources Engineer

I currently manage my team's projects & client relationships, and serve as the engineer-of-record for our work in Georgia, DC, and Puerto Rico.

Eric J. Smith, E.I.T.

Water Resources Engineer

Eric works with GIS analysis, hydrology, and hydraulic modeling for our residential, commercial, and municipal projects. He also trains and mentors students in our internship program. He obtained his BS in Civil Engineering from Kennesaw State University.

Casiano Ancalle, P.E., P.H.

Hydrologist and Environmental Engineer

Mr. Ancalle is a licensed professional engineer and licensed professional hydrologist with more than 45 years of experience in water resources and environmental engineering. He consults on all our projects and serves as the engineer-of-record for projects in Virginia, Maryland, and Puerto Rico.

Nathan Adams

Civil Engineer

Mr. Adams has more than 30 years of experience in land development and drainage design. He consults on our projects in Puerto Rico and Georgia.

Hunter Grant

Intern - Water Resources

Hunter works with watershed delineation, data processing, and GIS analysis. He is pursuing a BS in Civil Engineering.

Florencia Cloitre

Intern - Water Resources

Florencia works with watershed delineation, hydrologic modeling with HEC-HMS, and hydraulic modeling with HEC-RAS and ICPR. She is pursuing a BS in Environmental Engineering.

Marco Taveras, Jr.

Intern - Site/Civil

Marco works with watershed delineation, detention pond modeling, and drafting design sheets. He is pursuing a BS in Civil Engineering.

Kyliyah Daniel

Intern - Water Resources

Kyliyah models storm sewer and detention systems with Civil 3D tools including Hydraflow and SSA. She is pursuing a BS in Civil Engineering.

José Collazo

Intern - Water Resources

José works with bioretention design and watershed delineation. He is pursuing a BS in Civil Engineering.