Environmental Impact Assessments (EIA) are widely employed in Europe, USA, Australia and New Zealand, to fulfill the aims of your submission. Legislation and an empowered regulator is the foundation of the EIA in its various forms, both funded by taxation on business. No EIA no planning permission. A multitude of software packages exist to aid modelling. So I say good idea, but the marketplace may already be saturated on the software front. As for porous surfaces, how would you mitigate the risk of subsidence caused by water ingress? Could use a rigid lattice with vegitation growing through it, the roots would then bind the soil. Similar products already exist, to create green driveways.

Are septic tanks a new idea?