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Drainage Design for Planning & Construction

RIDA provides drainage design for residential and commercial developments across the UK, from planning-stage drainage layouts and hydraulic calculations through to detailed drainage design for technical approval and construction.
Our drainage system design work can include pipe sizing, gradients, invert levels, attenuation and storage, flow controls, outfalls, drainage drawings and coordination with SuDS and foul-water systems.
The design of drainage systems is developed around the proposed site layout, levels, discharge constraints and project requirements, giving architects, developers and contractors the technical information needed to progress the scheme.
Send us your site plan, survey information and any planning or drainage documents already available. We can review the information and confirm the required drainage design scope and fee.
Flood Risk Assessment and Drainage Strategies Services by RIDA Reports
Flood risk assessment for housing development near water channel
Years Of Experience
21 +

Drainage Design Consultants

RIDA prepares drainage calculations, layouts and engineering drawings for developments at planning, technical approval and construction stages. Our drainage design consultants work with architects, developers, planning teams and contractors to move projects from an agreed drainage approach to detailed engineering information.

Our work can cover drainage layouts, hydraulic calculations, pipe sizes, gradients, invert levels, attenuation, flow controls and construction-stage information.

For wider drainage advice across planning and development, our specialist drainage consultants can review the project requirements and related drainage services.

Send us your site plan, survey information and any planning or drainage documents already available. We can review the project and confirm the required drainage design scope and fee.

Drainage Design Services and Deliverables

Our drainage design service can include:

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Detailed Drainage Design

Calculated drainage layouts, pipework, levels, storage and controls for technical approval or construction.

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Drainage Design Calculations

Hydraulic calculations for runoff, discharge rates, attenuation and network performance.

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Drainage Layouts & Drawings

Coordinated drainage drawings aligned with buildings, roads and site constraints.

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Pipe Sizes, Levels & Gradients

Pipe diameters, invert levels, cover and gradients developed for the site.

Attenuation & Flow Control

Storage design and discharge control for restricted outfalls.

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Planning Conditions

Drainage drawings and calculations to support the discharge of planning conditions.

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Surface Water Drainage

Surface-water drainage design as part of the wider drainage scheme.

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SuDS & Foul Water Coordination

Coordination with SuDS features and dedicated foul-water drainage requirements.

Planning and Detailed Drainage Design

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Planning-Stage Drainage Design

Early drainage input to show the development can be drained and the layout can work.
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Detailed Drainage Design

The agreed drainage approach developed into calculated engineering information.
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Drainage Strategy or Design?

A drainage strategy sets the approach. Detailed drainage design defines the actual system.
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Construction Information

Drawings and engineering outputs for technical approval, tender or construction.
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Project Requirements

Design work developed around planning requirements, site constraints and project standards.
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Causeway FLOW Hydraulic Design

Drainage hydraulic analysis supported by engineering review and project coordination.

Planning and Detailed Drainage Design

RIDA provides drainage design at different stages of a development. Planning-stage design establishes whether the proposed drainage arrangement can work within the site. Detailed drainage design converts that approach into calculated pipework, levels, storage, controls and engineering drawings.

Planning-Stage Drainage Design

At planning stage, drainage design can show that the proposed development has a workable drainage arrangement and enough space for the required drainage infrastructure. The design can review the proposed layout, site levels, drainage constraints, discharge options and preliminary storage requirements.

Detailed Drainage Design

Detailed drainage design turns the agreed drainage approach into a calculated engineering system. RIDA can develop the final drainage layout, pipe diameters, invert levels, pipe gradients, manholes, attenuation volumes, flow controls, outfalls, exceedance routes and construction drawings required for the agreed project stage.

Drainage System Design and Hydraulic Calculations

Drainage system design combines the physical layout of the network with hydraulic calculations. RIDA assesses runoff, pipe capacity, discharge rates, attenuation storage and flow controls to check the proposed system against the project requirements.
The calculations are developed alongside the proposed drainage layout, site levels and connection points. RIDA uses Causeway FLOW for drainage hydraulic analysis, supported by engineering review of the site and proposed development.

Detailed Drainage Layouts, Levels and Pipework

A drainage system has to fit within the physical constraints of the development and perform hydraulically. The design can set pipe routes, pipe diameter, gradient, invert level, available cover, connection points, chambers and drainage features in coordination with buildings, roads, proposed levels and other site infrastructure.

Attenuation, Storage and Flow Control

Sites with restricted discharge can require runoff storage before release at the agreed rate. RIDA can calculate the storage requirement and incorporate tanks, basins, ponds, oversized pipework or other drainage features into the wider design where they suit the project.

Our Clients

Drainage Services

Drainage Strategies

Sustainable Drainage Design

Foul Water Drainage Design

Choose RIDA for Drainage Design

Why clients appoint our drainage design consultants

Where the project needs a site-specific flood risk assessment, RIDA can provide the separate planning assessment. Projects needing wider flood-risk advice can be reviewed by our specialist flood risk consultants.

Drainage strategy 250 for small developments using sustainable drainage and water management

What Does Our Drainage Design Include?

The design scope is set by the project stage, planning requirements and available information.

What Our Customers Say

Steve Morley MDA Wirral Ltd

We have a long association with RIDA, this is due to their high standards of professionalism and detailed level of information provided. Always efficient, responsive and reliable working with tight deadlines, highly recommended.

James Cogley Cogley Structural Solutions

We have had the pleasure of working with Arge at RIDA over several years and throughout this time the experience has consistently been very good. What stands out most is their responsiveness - any queries or issues have always been addressed promptly, which has given us great confidence and peace of mind.

Jon Lipka M&E Design and Build Ltd

I had an excellent experience with RIDA. From start to finish, their team was professional, responsive, and genuinely committed to customer satisfaction. Communication was clear and consistent, and they went above and beyond to make sure everything was done right on site at Soho Farmhouse.

Frequently Asked Questions

Drainage design is the engineering process used to determine how water will be collected, conveyed, stored and discharged from a development. The scope can include layouts, pipe sizes, gradients, levels, storage, flow controls, calculations and drawings.

Detailed drainage design converts the agreed drainage approach into a calculated engineering scheme. It can define pipework, levels, gradients, storage, flow controls, chambers, outfalls and drawings for the agreed project stage.

Yes. Send the planning condition and any drainage documents already prepared. RIDA can review the condition and confirm the drawings, calculations and supporting information needed for the drainage submission.

A drainage design can include layouts, pipe sizes, gradients, invert levels, manholes, storage, discharge controls, hydraulic calculations and detailed drawings. The exact package is set by the project stage and agreed scope.

RIDA provides separate SuDS Design and Foul Water Drainage Design services. The wider drainage design can coordinate those requirements with the development layout and proposed levels.

Send the site location, proposed development layout and any planning, survey or drainage information currently available. RIDA can review the information and confirm the likely scope before providing a fee proposal.