A field and laboratory investigation of kerb side inlet pits using four media types

Harsha Sapdhare; Baden Myers; Simon Beecham; Chris Brien; David Pezzaniti; Timothy Johnson

doi:10.1016/j.jenvman.2019.06.021

A field and laboratory investigation of kerb side inlet pits using four media types

J Environ Manage. 2019 Oct 1:247:281-290. doi: 10.1016/j.jenvman.2019.06.021. Epub 2019 Jun 25.

Authors

Harsha Sapdhare¹, Baden Myers², Simon Beecham³, Chris Brien⁴, David Pezzaniti⁵, Timothy Johnson⁶

Affiliations

¹ Natural and Built Environments Research Centre, University of South Australia, Mawson Lakes Campus, Mawson Lakes Boulevard, Mawson Lakes, South Australia, 5095, Australia. Electronic address: harsha.sapdhare@mymail.unisa.edu.au.
² Natural and Built Environments Research Centre, University of South Australia, Mawson Lakes Campus, Mawson Lakes Boulevard, Mawson Lakes, South Australia, 5095, Australia. Electronic address: baden.myers@unisa.edu.au.
³ Division of Information Technology, Engineering and the Environment, University of South Australia, Mawson Lakes Campus, Mawson Lakes Boulevard, Mawson Lakes, South Australia, 5095, Australia. Electronic address: simon.beecham@unisa.edu.au.
⁴ Phenomics and Bioinformatics Research Centre, School of Information Technology and Mathematical Sciences, University of South Australia, Mawson Lakes Campus, Mawson Lakes Boulevard, Mawson Lakes, South Australia, 5095, Australia. Electronic address: chris.brien@unisa.edu.au.
⁵ Natural and Built Environments Research Centre, University of South Australia, Mawson Lakes Campus, Mawson Lakes Boulevard, Mawson Lakes, South Australia, 5095, Australia. Electronic address: david.pezzaniti@gmail.com.
⁶ Natural and Built Environments Research Centre, University of South Australia, Mawson Lakes Campus, Mawson Lakes Boulevard, Mawson Lakes, South Australia, 5095, Australia; City of Mitcham, 5 Winston Court, Melrose Park, South Australia, 5039, Australia. Electronic address: tjohnson@mitchamcouncil.sa.gov.au.

PMID: 31252227
DOI: 10.1016/j.jenvman.2019.06.021

Abstract

Kerb side inlets with adjacent leaky wells are an emerging tool to harvest stormwater and to reduce runoff volumes and peak flow rates. This is achieved by collecting the first flush runoff into kerb side storages and infiltrating this water into the surrounding soil, thereby also reducing stormwater pollutant loadings. The hydraulic performance of the kerb side inlet, filter media and surrounding soil are key factors in the performance of these systems. However, no field or laboratory data are currently available for the hydraulic performance of a kerb side tree inlet pit. In this study, 12 tree inlet pits were constructed and filled with various media types including gravel, water treatment solids (a recycled waste product), sandy loam and clay to examine (1) leaky well infiltration rates (2) emptying times of the wells and (3) the well capacity (runoff storage volume) before and after runoff filtering through the wells. Using a laboratory model, the water harvesting performance of the kerb side inlet plate was also examined for various road longitudinal slopes. Using the field and laboratory data, simulation of the well performance was undertaken using the Model for Urban Stormwater Improvement Conceptualisation (MUSIC) to assess the capacity of these systems to reduce runoff volumes at the residential street scale. It was hypothesised that the type of filter media used in leaky well systems has a significant impact on the infiltration rate, regardless of the native soil type through which the stormwater eventually infiltrates. The results showed that the infiltration rates of systems filled with gravel were significantly higher than for the other media types, and this was followed by water treatment solids, sandy loam and clay. The results of the MUSIC modelling indicated that 2.8% of the mean annual runoff volume in the catchment could be harvested by the systems at the case study site. It was found that selection of high infiltration rate media and regular maintenance are the key factors for maintaining long-term performance of these systems.

Keywords: Emptying time; Infiltration testing; Inflow rate; Leaky well; MUSIC modelling; Urban runoff.

MeSH terms

Bays*
Benzamides
Rain
Water Movements
Water Purification*

Substances

Benzamides
pronamide