HydroloGIS is is an in-house tool from Viridian Logic Ltd run on a consultancy basis that identifies, ranks and prioritises the best interventions to create and where to create them in order to maximise the provision of nature-based solutions to local problems. It splits ecosystem services into two categories: water-flow services (flooding, water pollution, erosion and drought reduction), which are modelled mathematically; and place-based services (all others such as recreation and carbon sequestration), which are modelled using simple GIS data layers and rules. The output maps show how to maximise ecosystem service benefits, habitat connectivity and return on investment, in order to tackle problems such as meeting water quality targets and providing natural flood management (NFM). The tool can also estimate avoided flood damage costs due to NFM.


Maps / GIS data (sourced and managed by Viridian or provided by user).

GIS databases
Tables / statistics / reports
Local scale
Landscape scale
Regional scale
Cost of the tool (and guidance): 
Fee (consultancy service)
A range of land uses.
Resource requirement (software): 
None - the tool is a proprietary tool provided by the developer.
Level of technical expertise required: 
None – tool is run in-house by a consultant
Types of ecosystem service included: 
Habitat type (UK NEA habitats): 
Mountains, moors and heaths
Semi-natural grasslands
Enclosed farmland
Freshwater, wetlands and floodplains
Coastal margins
How does it work?: 

HydroloGIS combines hydrological and GIS algorithms to rank every 5 metre pixel across the study area for its current and future ability to solve water-flow problems, such as flooding, diffuse pollution and erosion/siltation. Services such as recreation, air quality and carbon services can then be added to show trade-offs, synergies and options for improvement. The platform provides raster map outputs that indicate where habitat creation will offer the greatest benefits in a study area, including maximising return on investment and habitat connectivity. These maps show prioritised opportunities for nature-based solutions to tackle water resource provision (including pond creation and groundwater recharge); pluvial, fluvial and groundwater flooding; water quality; and enhanced agricultural management.   Local preferences can be taken into consideration – for example, flooding may be more important than diffuse pollution in some areas – as well as protected sites or species. The local analyses can be expanded to regional or national scale.

Where can I get it?: 

Available on a consultancy basis whereby clients can commission Viridian Logic to run the tool and supply the resulting GIS layers, maps, tables and other materials. https://viridianlogic.com/