Residential drainage design shows how runoff from roofs, pads, driveways, slopes, and adjacent areas will be collected, conveyed, and discharged without leaving an unresolved site problem.
A drainage plan must work with the grading, building pad, driveway, septic area, retaining features, neighboring properties, roads, and existing flow paths. Calicore develops drainage concepts around the actual parcel and the level of analysis required by the reviewing agency.
The scope may include swales, drains, inlets, culverts, outlets, erosion-control measures, and supporting calculations when required. Large watersheds, floodplain analysis, or specialized hydrology can be coordinated with the appropriate discipline when the project exceeds the agreed civil scope.
Step by step
How the process works
The exact scope is matched to the project, but a typical assignment follows these steps.
01
Confirm the review path
We identify the controlling city, county, district, or utility and review the requirements that apply to the parcel and proposed work.
02
Collect site information
We review available plans and records, then identify the mapping, field observations, testing, or outside-professional information needed for design.
03
Prepare the civil documents
We develop the agreed plans, calculations, reports, or exhibits and coordinate them with the rest of the project.
04
Respond to review comments
When included, we address civil plan-check comments and revise the documents for resubmittal.
Review criteria
What the city or county generally reviews
Reviewers want the proposed work to be clearly located, supported by adequate site information, and consistent with the applicable local requirements.
Requirements vary by jurisdiction, parcel, and project type. Calicore confirms the current review requirements before finalizing the scope.
Parcel, proposed use, site layout, access, and applicable setbacks
Existing conditions and the technical basis for the proposed civil design
Coordination among grading, drainage, utilities, wastewater, and building plans
Required calculations, reports, notes, signatures, and responses to prior comments
What you receive
Typical project deliverables
Existing-flow and drainage-constraint review
Proposed drainage layout and elevations
Swale, inlet, culvert, or outlet details within scope
Drainage notes, calculations, and permit responses when required
Common project needs
When this service is useful
Custom homes and ADUs
Rural and sloped parcels
Driveway and access improvements
Sites with recurring ponding or runoff concerns
Frequently asked
Residential Drainage Design questions
Is drainage design separate from a grading plan?+
They are closely related. Grading establishes elevations and slopes, while drainage explains how runoff is collected and conveyed. They should be coordinated as one site design.
Can you design drainage for an existing problem?+
Yes. Calicore can document current flow paths, ponding, erosion, outlets, and contributing improvements before evaluating practical correction options.
Does a drainage plan guarantee neighboring flooding will never occur?+
No. The design addresses the defined site and design criteria. Actual performance also depends on maintenance, weather beyond the design basis, upstream conditions, construction, and conditions outside the project limits.
Send a short description of the work, any plans, specifications, or photographs you have, and tell us what you need the service to provide. Include a project location if it applies.
