Calibrating an Existing Stormwater Asset Using the 2014 Event

Stormwater Conference

The establishment of flow gauging and monitoring sites in a stormwater network often requires the installation of new assets, for example, Parshall flumes, weirs, or calibrated culverts. In the majority of cases, this requires a capital budget for the installation of the structure, and results in a new potential obstruction to flow and a new asset that requires cleaning and maintenance. A straightforward and reliable technique for the calibration of existing structures would facilitate the creation of more gauging points in stormwater networks without the need to install new structures. During the 2013 construction season a Type VI USBR energy dissipation structure was established downstream of the Russell Crescent catchment, a 1.1km2 catchment on the side of Mt Ngongotaha. Using construction drawings, verified with structure from motion (SFM) photogrammetry techniques a 3 dimensional model of the outlet has been created and used to create a computation fluid dynamics (CFD) model. This model has been run for various flows and depth metrics taken from the model to establish a hydrograph set for the structure. Photographs of the structure and the downstream channel were taken during the August 2014 (3 - 4 year ARI) event providing sufficient calibration data to extrapolate the flows through the structure for comparison against the calculated hydrographs. This study outlined the techniques, algorithms and software packages used in the calibration of the Russell Crescent structure, thus providing a method for the calibration of existing structures of variable shape

Conference Papers Resource - Conference Papers Stormwater

2. Adam Tokelove.pdf

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22 Jun 2016