Stormwater Drainage Layouts
Plans showing collection routes, surface water inlets, manholes, pipe corridors and connections to approved site outfalls.
Civil engineering / drainage documentation
Stormwater & Water Drainage Design Services
Support development and infrastructure projects with coordinated stormwater drainage layouts, network plans, hydraulic design documentation and construction drawing packages. Our drafting scope follows the appointed engineer’s design criteria and project-specific drainage requirements.
Site drainage layoutsProfiles & schedulesRevision-controlled deliverables
Conceptual drainage diagram only. Final pipe sizing, elevations and discharge permissions must follow approved engineering documents.
Scope of work
Drainage design support from site strategy to coordinated drawings
We prepare drainage documentation for engineers, development consultants and construction teams. Network sizing, flood assessments and drainage approvals depend on location-specific criteria, validated assumptions and the responsible engineer’s review.
Runoff & Flow Assessment
Support for catchment definition, rainfall/runoff inputs, discharge allowances and hydraulic design documentation under project-defined criteria.
Pipe Network Profiles
Plan-and-profile drawings with pipe diameters, inverts, gradients, cover levels, manhole references and crossing coordination.
Attenuation & Storage Systems
Drawing support for detention or retention features, underground storage, flow-control arrangements and overflow provisions.
Sustainable Drainage Measures
Layouts for swales, permeable pavement zones, infiltration elements and other SuDS/LID components where suitable design inputs exist.
Foul Water & Combined Coordination
Separate foul-water network drawings, interface checking and utility conflict coordination where included in the project scope.
Typical output package
Deliverables designed for review, coordination and construction planning
Outputs are adjusted to the agreed design phase, applicable authority standards and drawing templates.
- Site drainage plans showing routes, drainage structures and outfalls
- Stormwater and foul-water network plans where contracted
- Longitudinal profiles with inverts, slopes and cover information
- Manhole, inlet and drainage structure schedules
- Attenuation, detention and flow-control arrangement drawings
- Catchment plans, hydraulic calculation summaries or model outputs where in scope
- Coordinated CAD/PDF drawings and documented revision responses
Coordinated workflow
From drainage inputs to review-ready documentation
Maintain consistency between civil grading, network levels, hydraulic assumptions and drawing revisions.
Review site information
Confirm topography, existing networks, catchments, outfalls and applicable design criteria.
Develop drainage layouts
Draft pipe routes, structures, preliminary levels and attenuation arrangements from the design inputs.
Coordinate & check
Compare network profiles with grading, utilities and structural interfaces; identify unresolved issues.
Issue controlled drawings
Produce the agreed schedules and drawings for engineer review and incorporate authorized revisions.
Design responsibility
Drainage calculations and regulatory approval require authorized review
Flood risk assessments, discharge limits, pipe and storage capacities, infiltration suitability and environmental compliance require project-specific engineering judgement and applicable authority review.
Drafting services do not replace engineering certification, statutory consent or site investigations. Where hydraulic analysis or calculations are part of the scope, assumptions and final designs must be reviewed by the appointed competent professional.
Frequently asked questions
Water drainage design FAQs
What site data is needed to start stormwater drainage design?
Current topographic survey, site boundaries, ground levels, proposed development layout, drainage records, outfall information and jurisdictional criteria are typical inputs. Rainfall data and geotechnical information may also be required.
Can you prepare both stormwater and foul-water drainage drawings?
Yes, subject to the contracted scope. Stormwater and foul-water systems are documented separately with their respective flow assumptions, network layouts, levels and approval requirements.
Do you provide hydraulic calculations and runoff assessments?
Calculation and hydraulic modelling support can be scoped where sufficient data and competent engineering oversight are available. Models and assumptions require technical review by the designated engineer.
Are your drainage drawings approved for construction or permitting?
Not automatically. Planning submissions, statutory approvals, construction acceptance and professional certification are responsibilities of the authorized design team and relevant local authority.
Drainage design & drafting support
Need a coordinated stormwater drainage drawing package?
Share your site plan, survey, drainage information and required deliverable format so we can discuss a clearly defined scope.