This document outlines the services offered by Alejandro Dussaillant related to water issues including sustainable drainage systems, water resources, floods, wetland hydrology, field surveys, remote sensing, environmental impact assessments, and workshop organization. It also describes a project led by Dussaillant to develop a modeling tool to design bioretention systems for sustainable drainage that considers pollutant retention and the rainwater balance. The model was applied to the design of a rain garden system for a roundabout in the UK, finding that lead could build up over 10 years but copper would be successfully retained, and enhanced pollution of groundwater was not expected.

1. Alejandro Dussaillant, PhD
Services offered in Water issues
• Sustainable Drainage, WSUD and Green Infrastructure: rainwater/stormwater infiltration,
pollutant retention in soil, groundwater recharge; bioretention, rain gardens, green roofs,
wetlands; sensor equipment and monitoring design, data acquisition; numerical modelling
and simulation for climate scenarios and design (own models and others)
• Water Resources: design of resource storage practices at surface (small dams & reservoirs)
and subsurface (enhanced infiltration to recharge groundwater), catchment sensor
instrumentation for hydrologic studies, data acquisition and analysis (including flow regime,
trend analysis, flood frequency analysis, etc.)
• Floods: pluvial and fluvial floods; low-cost sensor systems, data acquisition and analysis;
hydrologic and hydraulic modelling (including use of HEC-RAS model); hazard
assessments, glacial floods, volcanic floods and lahars; sediment transport, erosion and
deposition/infilling, reservoir silting; fluvial geomorphology and riparian vegetation
• Wetland hydrology: water balance assessments including estimation of inflows, storage and
outflows; relation to vegetation and general ecosystem function
• Field surveys: topographic and bathymetric surveys; flow velocities and stream discharge
measurements; sensor installation for rain, soil moisture, streamflow, and groundwater
levels
• Remote Sensing and Geographic Information Systems: RS data and analysis; GIS data and
analysis
• Environmental impact: assessments inclusive of water-related issues, hydrology and
sediments (including hydropower and other projects)
• Workshop and CPD organisation and delivery in the above topics
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2. Project: Design of Sustainable Drainage Systems (SuDS), integrating rain water balance and
pollutant retention in a design modelling tool: application to bioretention systems – model
development, simulation and design guidelines for UK. University of Greenwich RAE-ENG-14
fund 2010-12 (£30000)
A major problem of increased urbanization is the rise in pollution caused by stormwater run-off. Among
alternative management strategies, the use of sustainable drainage systems (SuDS) such as rain gardens and
other bioretention facilities is becoming an increasingly attractive option to reduce these problems. However,
there are few tools if any available for their design considering pollutant retention. In this work we
developed a dual-permeability based model that predicts the fate of heavy metals in SuDS, and applied it to
the design of a rain garden system for a planned roundabout in Thanet, UK, for Kent County Council.
Preliminary design considered two layers: an upper root zone with organic soil and a storage sandy sub-layer,
each 30 cm thick, for a bioretention area of either 5 or 10% the size of the contributing impervious surface.
Two scenarios were examined: the accumulation and movement of metals through the soil profile, and the
possibility of groundwater contamination due to preferential flow via soil macropores. Results showed that
levels of lead can build up in the upper layers of the system, but only constitute a health hazard (surpass UK
standard of 750 mg/kg) after 10 years. Simulations show that copper was successfully retained (no
significant concentrations below 50cm of soil depth). Finally, results indicated that due to site conditions
enhanced pollution due macropore flow was not a threat to the chalk aquifer in the timeframe considered.
Lead concentration in rain garden soil with highly retentive (organically enriched) soil and two area ratios
Copper concentration in soil-water for highly retentive (organically enriched) soil and two area ratios
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