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Stormwater Management

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Overview

ESD-to-MEP stormwater engineering across the full Maryland regulatory landscape — concept through agency approval and construction certification.

01 · Service

Stormwater Management Design

SWM concept, site development, and final plans engineered to Environmental Site Design to the Maximum Extent Practicable. Full calculation packages (WQv, Re-v, Cp-v, Qp), agency response coordination, O&M documents, and easement exhibits for recordation. Built for Maryland 2000 manual jurisdictions and the 2009 Stormwater Act.

02 · Service

Erosion & Sediment Control Design

Stage I/II/III E&SC plans for the full disturbance range — from residential standard plans to large-site detailed sediment basins and multi-phase sequencing. MD 2011 Standards and Specifications, county SWCD coordination, and NOI/SWPPP packages for NPDES Construction General Permit coverage.

03 · Service

Infiltration Testing & BMP Feasibility

Field-supervised infiltration testing per MDE protocol to establish design infiltration rates for ESD facility sizing. Test pit logs, soil characterization, and a written feasibility memo identifying which ESD or structural BMPs are viable on a given site — done early enough to influence layout.

04 · Service

SWM Pond / Structure Design & Routing

HydroCAD-based routing for detention, extended detention, infiltration, and ESD facilities. Pond grading, outlet structure design, emergency spillway sizing, and dam-safety classification analysis where required. Sized against pre/post peak flows and water quality targets with documented calibration.

05 · Service

LEED Rainwater Management

Sustainable Sites credit documentation for LEED projects — percentile-rainfall analysis, integrated runoff management strategy, and the calculation package that LEED reviewers actually accept on first submission.

06 · Service

Low Impact Development Design

Bioretention, micro-bioretention, permeable pavement, green roofs, submerged gravel wetlands, tree boxes, and integrated ESD treatment trains. Landscape-integrated by design — these features should look like site amenities, not engineering scars.

07 · Service

Stream Restoration

Natural channel design support, geomorphic assessments, in-stream structure sizing (cross-vanes, J-hooks, riffle-pool sequences), and floodplain reconnection coordination. Typically delivered in partnership with stream specialists; we handle the H&H, sediment transport, and permitting envelope.

Concept models

The complete M-2 submerged gravel wetland inside its grassed embankment: inflow pipe, stone forebay, gabion weir, two planted gravel cells, and the outlet structure
Opens the cutaway as a 3D model you can orbit and zoom.
M-2 Submerged Gravel Wetland

Built from the MDOT SHA M-2 design guidance: forebay, gabion weir, two gravel treatment cells, and a J-hook outlet that holds the permanent stored-water level 4 in below the planting media.

  1. Inflow
  2. Forebay
  3. Gabion weir
  4. Cell 1
  5. Cell 2
  6. Outlet
Illustrative — not to scale. Design guide only; not a substitute for project-specific profiles and sections.
The complete M-7 rain garden: a planted cell inside a grassed embankment, with stone at the inflow and an overflow grate
Opens the cutaway as a 3D model you can orbit and zoom.
M-7 Rain Garden

3 in mulch, 6 in planting media, 10 in No. 57 stone, and a 4 in underdrain. The sequence shows rainfall ponding in the cell, rising to the overflow grate, and leaving through the outfall.

  1. Rainfall
  2. Ponding
  3. Overflow inlet
  4. Outfall
Illustrative — not to scale. Design guide only; not a substitute for project-specific profiles and sections.
A whole residential lot seen from above: a one-story house, a lawn with a small flowering rain garden beside the house, a sidewalk, and a curb inlet at the street
Each button opens a 3D model you can orbit and zoom.
Backyard Rain Garden

A 15 x 10 ft rain garden about 13 ft from the house: 3 in mulch, 6 in planting media, 10 in No. 57 stone and a 4 in underdrain. Water ponds up to 6 in, then overflows through a grated outlet and a pipe to the curb inlet and the public storm drain.

  1. Rain
  2. Ponding
  3. Soaks into the stone
  4. Overflow grate
  5. Public storm drain
Illustrative — not to scale. Design guide only; not a substitute for project-specific profiles and sections.
A whole residential lot seen from above: a one-story house, a lawn with a small planted gravel wetland and its grated outlet beside the house, a sidewalk, and a curb inlet at the street
Each button opens a 3D model you can orbit and zoom.
Backyard Submerged Gravel Wetland

A 15 x 10 ft planted gravel wetland with no forebay. Inflow drops onto a stone strip, moves through stone that stays wet 4 in below the soil, and leaves over a J-hook inside a grated outlet, piped to the curb inlet and the public storm drain.

  1. Inflow
  2. Stone strip
  3. Wet stone
  4. J-hook outlet
  5. Public storm drain
Illustrative — not to scale. Design guide only; not a substitute for project-specific profiles and sections.
A whole residential lot seen from above: a one-story house, a lawn with a shallow grass swale running from the downspout to a curb cut, and the street, with no sidewalk
Opens a 3D model you can orbit and zoom.
Grass Swale to a Curb Cut

A 6 ft wide, 6 in deep grass swale from the downspout across the yard to a curb cut, where a short concrete apron carries the water through the grass strip and into the gutter. Shown without a sidewalk; a sidewalk crossing would need a covered chase under the walk.

  1. Downspout
  2. Grass swale
  3. Curb cut
  4. Gutter
Illustrative — not to scale. Design guide only; not a substitute for project-specific profiles and sections.
A whole residential lot seen from above: a one-story house, a lawn with a square grated yard inlet set flush in the grass, a sidewalk, and a curb inlet at the street
Opens a 3D model you can orbit and zoom.
Yard Inlet

A 3 x 3 ft precast yard inlet with a cast-iron grate, set flush in a shallow dish in the lawn. Roof runoff leaves the downspout onto a splash block, sheets across the lawn with the yard runoff, and ponds briefly at the grate before dropping in. Gutter flow enters the public curb inlet.

  1. Roof and downspout
  2. Splash block
  3. Sheet flow across the lawn
  4. Yard inlet
  5. Public storm drain
Illustrative — not to scale. Design guide only; not a substitute for project-specific profiles and sections.

Civil site design, from feasibility to record plat.

Tell us about the parcel, the disturbance area, and the jurisdictional reviewers in play. The response will outline a likely permit pathway.

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PE · MD #49353 · VA #66472 · DE #28440 · NV #027358