Last Updated: November 5, 2026
The information from Runwell Durham Drainage Company is intended to help property owners understand exterior drainage options and prepare questions for an assessment. A general description of a drain, material or local process cannot establish the conditions or permissions at a particular address.
Planning information and proposed work
A page, calculator result or telephone enquiry is not a written construction agreement. The property-specific scope should identify the work proposed, the receiving area, access, restoration, exclusions and any conditions that must be resolved before work starts. Review those details and the terms of the actual written proposal before authorizing construction.
Tools and estimates
The rainfall tool estimates the amount of rain falling on the horizontal area entered. It does not size a pipe or account for every loss and inflow. The options planner organizes observations and suggests questions. Neither tool determines a legal discharge point, establishes eligibility for assistance or quotes an installed price.
Safe observations and separate expertise
Observe from a safe position. Do not enter moving water, excavate beside utilities, lift heavy covers or handle suspected wastewater or electrical hazards to gather information for this site. Structural concerns, interior waterproofing, sanitary plumbing and regulated engineering can require separately qualified advice. Confirm current requirements with the authority responsible for the parcel and proposed work.
For a question about a particular property, contact Runwell with the location and the result you want to achieve.