It was interesting to find in a LGOIMA request document (4.7 MB PDF) dated 03 February 2021 the information that at Waikawa Beach:
There is one stormwater discharge outfall in Waikawa Beach, which discharges into the Waikawa River (shown in Figure 4.)
It goes out through that drain in Hank Edwards Reserve.
It would be interesting to know how that behaves at times of high rainfall, high river flow, high tide.
Something to keep in mind though is:
To prevent floodwaters from feeding back into the stormwater network and flooding properties, one-way flap valves are used. The valves do cause ponding which recedes when the rain event stops, and the water level drops. Source: Stormwater - Urban Roading & Rural - Horowhenua District Council
Makes you wonder if that all contributes to the Strathnaver puddle when we have heavy rainfall and high water table.
Note: Local Government Official Information and Meetings Act 1987 (LGOIMA).
