Hydrology Assessment & Catchment Modelling
Every stormwater and flood design starts with one question: how much water arrives, and when. We model it properly rather than assuming.
What you receive
Hydrology report with catchment plan
Peak flow estimates for pre- and post-development scenarios
Pipe and pit network capacity assessment
Hydraulic Grade Line analysis
Detention and discharge sizing inputs
How we do it
Catchment modelling in DRAINS (Watercom)
ARR 2019 rainfall data, temporal patterns and areal reduction factors
Contributing catchment delineation from LiDAR, survey and council drainage plans
Existing stormwater system capacity checks — where council's pipes are already full, we say so early
Pre- versus post-development flow comparison
Outputs carried directly into detention, WSUD and flood models
When you need it
Supporting an OSD design, sizing a drainage network, assessing whether council's downstream system can take your discharge, or establishing inflows for a flood model. Standard for subdivision, multi-unit, commercial and industrial developments.
Related services On-Site Detention · Flood Modelling · Stormwater Diversions · Stormwater Management
Frequently Asked Questions
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Usually it's part of it. A standalone report is needed when council asks for one, or when capacity is contested.
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We identify it and design around it — attenuation, an alternative discharge point, or a diversion.
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Yes, as standard practice, unless council specifies otherwise.