WELLINGTON REGION RUNOFF HYDROGRAPH CALCULATOR FOR STORMWATER RUNOFF CALCULATIONS
Stormwater Conference 2023
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C. Locyker (SLR Consulting)
ABSTRACT
In 2016, Wellington Water Limited (WWL) released the Reference Guide for Design Storm Hydrology to provide guidance to stormwater modelling professionals and land developers for estimating flood hydrology for small ungauged urban catchments in the region managed by WWL. The purpose was to provide a consistent methodology to estimate runoff from a given catchment/sub-catchment, and appropriately plan for and manage the resulting runoff associated with any change in land use. One of the key drivers was to move away from a single design peak flow estimate (Rational Method approach) to a flood hydrograph approach. This was to account for event volume and support the design of stormwater attenuation infrastructure.