Do you provide grading and drainage plans for county approval, or only design drawings?

The complete package a county reviewer expects is prepared, including the grading plan, drainage plan, stormwater management report, and any SWPPP documentation the jurisdiction requires for submittal.

Can you provide PE-stamped civil engineering plans?

Yes. The in-house team prepares the grading, drainage, and stormwater design, with seal and signature coordinated through licensed Professional Engineer partners for jurisdictions that require a stamped submittal.

Do you handle county review comments if our first submittal gets rejected?

Yes. County review response and revision services are part of the standard grading and drainage engagement, addressing reviewer comments and resubmitting until the plan is approved.

What's the difference between a detention pond and a retention pond?

A detention pond temporarily holds stormwater and releases it at a controlled rate before draining completely, while a retention pond maintains a permanent pool of water and is typically used where water quality treatment is also required.

Do you prepare SWPPP documents for NPDES construction permit compliance?

Yes. Erosion and sediment control drawings, narrative, and inspection documentation are prepared for NPDES Construction General Permit compliance on sites disturbing one acre or more.

Can you provide as-built drawings after construction is complete?

Yes. Civil as-built drawings reflecting constructed grading, pipe inverts, and structure locations are prepared, formatted for the reviewing agency's final certification and project closeout.

What information do you need to start a grading and drainage plan?

A topographic survey of the site, the proposed site layout or building footprint, and the applicable county's drainage criteria manual or design standard.

SWPPP and Erosion Control Plans Services | ESCP & Civil Engineering

SWPPP and Erosion Control Plans Services

CAD Drafter’s SWPPP and erosion control plans services lay out the silt fence, sediment traps, inlet protection, and stabilization sequence that keep a construction site’s dirt where the grading plan put it, from the day the construction entrance goes in to the day permanent vegetation takes over.

Behind every erosion control sheet sits a set of numbers that must be checked out too. Our civil engineering drainage calculations, pond sizing, earthwork cut and fill volumes, and water demand figures are worked up alongside the plan itself, so the SWPPP a county reviewer signs off on is backed by math that holds, not just a sheet that looks complete.

About Us Get A Quote

What Our Erosion and Sediment Control Plans (ESCP) Actually Cover

CAD Drafter drafts the ESCP and runs the supporting calculations; we don’t inspect your site after a storm or install the silt fence ourselves. Contractors, developers, and civil engineers send us a grading plan and a disturbance area; we return a phased erosion control layout and the NPDES-compliant SWPPP documentation that goes with it.

Why Contractors Outsource SWPPP Design

A construction general permit violation carries a real fine, and county reviewers know exactly which BMP layouts and stabilization notes are missing from a rushed submittal. Outsourcing SWPPP design for county permits to a team that drafts nothing else tends to mean fewer comment letters and fewer stop-work conversations with an inspector.

Our SWPPP and Erosion Control Plans Services Include

Erosion and Sediment Control Plans (ESCP)
SWPPP Design for County Permits
EPA NPDES Stormwater Permit Compliance Plans
Best Management Practices (BMPs) Layout
Silt Fence & Sediment Trap Detailing
Civil Engineering Drainage Calculations
Runoff Calculation & Watershed Analysis
Civil As-Built Drawings Services

Sample Upload Plan

Get Your Grading and Drainage Plans Started

Our SWPPP and Erosion Control Plan Services

Erosion control is a sequence, not a single drawing. Here’s how we approach the scopes that make up a complete SWPPP and sediment control package.

Erosion and Sediment Control Plans (ESCP)

Silt fence alignment, construction entrance location, inlet protection, and sediment basin sizing, phased to match the grading contractor’s actual sequence of clearing, cutting, and stabilizing.

SWPPP Design for County Permits

The narrative, drawing set, and inspection log format specific to your county’s construction general permit requirements, built to match the way your local reviewer expects a submittal organized.

EPA NPDES Stormwater Permit Compliance Plans

Construction Site Runoff Control documentation satisfying federal NPDES Construction General Permit requirements for sites disturbing one acre or more, including the Notice of Intent support documentation reviewers ask for.

Best Management Practices (BMPs) Layout

Selection and placement of the specific erosion and sediment control practices, silt fence, check dams, rock berms, or turbidity barriers, that fit the site’s soil, slope, and drainage pattern rather than a generic template.

Civil Engineering Drainage Calculations

Volume and peak flow rate calculations supporting every pipe, basin, and BMP sizing decision on the plan, run using the same rainfall and watershed data the county’s own reviewers check against.

Retention and Detention Pond Sizing

Pond volume, outlet structure, and freeboard calculations sized to hold construction-phase runoff and post-development peak flow within the release rate the downstream system was designed for.

Construction Earthwork Cut and Fill Calculations

Hydrologic earthwork volume balancing between cut and fill areas, minimizing the material that has to be hauled off-site or trucked in, while confirming the finished grade still drains the way the plan intends.

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Standard-Referenced Design

Every BMP and Calculation Checked Against The Standard That Governs It

A SWPPP has to satisfy federal, state, and county requirements at the same time, and a plan built around only one of the three usually gets sent back. We check every sheet against all of them.

USDA-NRCS Conservation Practice Standards

Design specifications for erosion control practices such as silt fence, temporary seeding, and mulching, referenced where a county’s ordinance points to NRCS standards directly.

EPA NPDES Construction General Permit (CGP)

Federal Clean Water Act Section 402 permitting framework governing SWPPP content, inspection frequency, and Notice of Intent requirements for construction sites disturbing one acre or more.

County / Local Erosion & Sediment Control Ordinance

Jurisdiction-specific BMP standards, inspection schedules, and bonding requirements that a submittal must match before a grading permit is released.

NRCS TR-55 & Rational Method

Peak flow and runoff volume methodology underlying the drainage calculations that size sediment basins, pond outlets, and temporary diversion structures.

State-Delegated NPDES Programs

Many states administer their own construction general permit under EPA authorization, with additional monitoring or reporting requirements layered on top of the federal baseline.

EPA National Menu of Stormwater BMPs

Reference practices and effectiveness data used to justify BMP selection for a site’s specific soil, slope, and discharge condition.

Deliverable Types

SWPPP and Erosion Control Deliverables We Produce

Every package is broken into the documents your county reviewer needs, the documents your grading contractor needs, and the calculation package that backs both.

All

Erosion and Sediment Control Plan (ESCP)

Phased BMP layout showing silt fence, construction entrance, inlet protection, and sediment basin locations matched to the grading sequence.

SWPPP Narrative & Inspection Log

The written pollution prevention plan and the inspection and maintenance log format required for NPDES compliance.

Drainage Calculation Package

Volume and peak flow rate calculations supporting every BMP, pipe, and pond sizing decision on the plan.

Pond Sizing Report

Detention or retention pond volume, outlet structure, and freeboard calculations documented for the reviewing agency.

Earthwork Cut & Fill Report

Volume balancing summary showing cut, fill, and any import or export material required to achieve the finished grade.

Water Demand & Fire Flow Calculations

Domestic and fire flow figures supporting the utility sizing shown on the site’s water and sewer plans.

SWPPP & Erosion Control Elements We Design

Silt Fence & Sediment Trap

Intercept Sheet Flow Sediment
Initial Clearing

Construction Entrance

Reduce Track-Out onto Public Roads
Initial Clearing

Inlet Protection

Prevent Sediment Entering Storm System
Grading / Utility Installation

Sediment Basin

Capture Runoff from Larger Disturbed Areas
Mass Grading

Temporary Stabilization

Hold Exposed Soil Between Phases
Rough Grading

Permanent Stabilization

Establish Final Vegetative or Hard Cover
Project Closeout

Sites We Provide SWPPP & ESC For

Residential Subdivision Construction

Mass Grading, Multi-Lot
Silt Fence, Sediment Basin

Commercial Site Construction

Single-Pad Site Disturbance
Silt Fence, Inlet Protection

Multi-Family Site Construction

Phased Multi-Building Disturbance
Sediment Basin, Phased Stabilization

Road & Utility Construction

Linear Corridor Disturbance
Check Dams, Rock Berms

Industrial Site Construction

Large Roof & Pavement Area
Sediment Basin, Water Quality BMP

Utility / Pipeline Construction

Narrow Linear Trench Disturbance
Silt Fence, Temporary Diversion

Civil Calculations Summary

Drainage Calculations

Peak Flow & Runoff Volume
Hydrology / Hydraulic Report

Pond Sizing (Detention/Retention)

Pond Volume, Outlet & Freeboard
Pond Sizing Report

Earthwork Cut & Fill Calculations

Volume Balancing, Import/Export
Earthwork Volume Report

Water Demand Calculations

Domestic Flow Requirement
Utility Sizing Memo

Fire Flow Calculations

Required Fire Suppression Flow Rate
Utility Sizing Memo

Hydraulic Calculations

Pipe & Structure Capacity
Drainage Calculation Package

Our Process

How CAD Drafter Delivers SWPPP and Erosion Control Plans

Our drafting workflow exists to keep a construction site’s sediment on the site, and the plan behind it out of a reviewer’s rejection pile. Here’s the 4-step process our civil drafting team follows:

Grading Plan & Disturbance Review

We review your grading plan, disturbed area, and construction phasing, confirming which county ordinance and NPDES program applies before drafting starts.

Package Quote & Timeline

You receive a scoped price and a release date broken down by ESCP sheets, SWPPP narrative, and any calculation package your project needs.

Drafting, Calculations & Internal QC

Our team drafts the phased BMP layout and runs the supporting drainage, pond, and earthwork calculations, then passes every sheet through an internal review before it reaches your desk.

Release, Permit Support & Revisions

You receive editable plan files, with county plan review revisions and stamp support included per your project’s drafting agreement.

2,100+

SWPPP & ESCP Packages Released

900+

Pond Sizing & Drainage Calculation Sets Completed

600+

Earthwork Cut & Fill Reports Prepared

24-48 Hrs

Standard Package Release

98%
Permit Approval
First Time

Why Choose Us

Why Contractors & Developers Choose CAD Drafter For SWPPP and Erosion Control

General contractors, developers, and civil engineers keep sending us their SWPPP and erosion control scope for a specific reason. Unlike firms that hand back one generic silt fence layout for every site, our team phases the BMPs to match the site’s actual grading sequence and backs every number with a calculation.

We Draft, Your Engineer Confirms

We never alter design intent. Every SWPPP and erosion control plan carries the disturbance area, soil, and drainage criteria your civil engineer of record established, ready for their review and stamp.

Standard-Referenced Compliance Drafting

Sheets reference the EPA NPDES Construction General Permit, state-delegated NPDES programs, county erosion and sediment control ordinances, and the EPA National Menu of Stormwater BMPs as each applies to your site.

Plans Backed By Calculations

Every ESCP ships alongside the drainage, pond sizing, and earthwork calculations that justify it, not a standalone drawing with no math behind it.

Scalable Drafting Capacity

Take on a single ESCP revision or a full multi-phase SWPPP package without adding a compliance drafter to your own office.

Software Our Civil Calculations Team Works In

AutoCAD Civil 3D

HydroCAD

Hydraflow

WaterCAD

Bentley SewerGEMS

Benefits Of Outsourcing To The Team

Why Firms Outsource SWPPP and Erosion Control Plan Drafting

Keeping a compliance specialist on staff who tracks every county’s erosion control ordinance and every NPDES update is a narrow hire against a construction pipeline that starts and stops with the weather. Outsourced SWPPP and erosion control plans services let contractors and developers flex drafting capacity without carrying that specialty as fixed overhead.

Lower Drafting Overhead: A per-package rate instead of a salaried compliance drafter on staff.

Faster Plan Release: A dedicated civil drafting team means your SWPPP and ESCP submittals aren’t queued behind someone else’s deadline. Standard packages release in 24-48 hours.

Built-In QC Review: Every plan and calculation passes an internal review before it reaches your desk for approval.

Technologies Our Civil Calculations Team Works With

Volume & Peak Flow Rate Calculations
Hydrologic Earthwork Volume Balancing
BMP Effectiveness & Placement Modeling
Pond Routing & Outlet Structure Sizing
Water Main Sizing & Flow Rate Analysis
Cloud-Based Plan Review & Markup

Sample contact Us

Our Certificate

1 2 3

Client Feedback To Our SWPPP and Erosion Control Plans Services

★ ★ ★ ★ ★

ESCP phasing matched our actual grading sequence instead of a generic template, so we never had to relocate a silt fence mid-job.

Wesley CombsGeneral Contractor

★ ★ ★ ★ ★

Earthwork cut and fill numbers came back balanced close enough that we skipped hauling in fill material we’d budgeted for.

Danielle PetrovLand Development Manager

★ ★ ★ ★ ★

Pond sizing report gave the county reviewer every number in the format they wanted, so the SWPPP cleared review without a resubmittal.

Isaiah MarchettiCivil Engineer, P.E.

Frequently Asked Question

Do I need a SWPPP for every construction project?

A SWPPP is generally required once a project disturbs one acre or more of soil under the EPA NPDES Construction General Permit, though many state and county programs set their own, sometimes lower, disturbance threshold.

What’s the difference between an ESCP and a SWPPP?

An erosion and sediment control plan (ESCP) is the drawing set showing BMP layout and phasing, while a SWPPP is the broader compliance package that includes the ESCP plus the narrative, inspection log, and Notice of Intent documentation required under NPDES.

Can you calculate detention and retention pond sizing as part of a SWPPP package?

Yes. Retention and detention pond sizing is one of our most requested calculation packages, sized to hold construction-phase and post-development runoff within the county’s required release rate.

Do you provide earthwork cut and fill calculations to help balance a site’s dirt?

Yes. We calculate cut and fill volumes and help identify where grading can be adjusted to reduce material that needs to be hauled off-site or imported.

Can you help respond to county review comments on a SWPPP submittal?

Yes. County plan review revisions and stamp support are included in our standard SWPPP and erosion control engagement, addressing reviewer comments until the plan is approved.

SWPPP and Erosion Control Plans Services

What Our Erosion and Sediment Control Plans (ESCP) Actually Cover

Why Contractors Outsource SWPPP Design

Our SWPPP and Erosion Control Plans Services Include

Get Your Grading and Drainage Plans Started

Our SWPPP and Erosion Control Plan Services

Erosion and Sediment Control Plans (ESCP)

SWPPP Design for County Permits

EPA NPDES Stormwater Permit Compliance Plans

Best Management Practices (BMPs) Layout

Civil Engineering Drainage Calculations

Retention and Detention Pond Sizing

Construction Earthwork Cut and Fill Calculations

Every BMP and Calculation Checked Against The Standard That Governs It

SWPPP and Erosion Control Deliverables We Produce

Erosion and Sediment Control Plan (ESCP)

SWPPP Narrative & Inspection Log

Drainage Calculation Package

Pond Sizing Report

Earthwork Cut & Fill Report

Water Demand & Fire Flow Calculations

How CAD Drafter Delivers SWPPP and Erosion Control Plans

Grading Plan & Disturbance Review

Package Quote & Timeline

Drafting, Calculations & Internal QC

Release, Permit Support & Revisions

Why Contractors & Developers Choose CAD Drafter For SWPPP and Erosion Control

Software Our Civil Calculations Team Works In

Why Firms Outsource SWPPP and Erosion Control Plan Drafting

Technologies Our Civil Calculations Team Works With

Our Certificate

Client Feedback To Our SWPPP and Erosion Control Plans Services

Frequently Asked Question

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