Well,

Only for an explanation;

Geohydrologically, when we say soil water retention capacity (Specific retention), that means water can not be exploited. The correct is soil water yield capacity (Specific yield).

It is not possible to remove all the water in the sediments by pumping from the wells due to the fact that the molecular strength (cohesion and adhesion) and surface tension forces are higher than the forces of gravitational attraction and a certain amount of them remains between the ends of the grains and cracks, no matter how much the discharge operations increase. This water is called the retention water. The percentage of the volume of water retained or remaining to its total volume in what is called specific retention.

Regards

One distinguishing feature might be that a natural water retention measure may be defined without regard to water quality, whereas water conservation usually has (implicitly or explicitly) water quality characteristics associated with it (i.e., conservation of clean or otherwise valuable water is typically associated with the term water conservation).

Also water conservation usually entails the efficient use of water (e.g. for agricultural, industrial, or domestic use).

Thank you for your reply. Do you know any research in urban areas regarding the concept of green and blue infrastructure?

Wiktor--this is outside my area of expertise. I live in California, here the descriptor 'green' with respect to infrastructure has been used; however I don't recall ever seeing/hearing the term 'blue infrastructure'--though here in water-scarce California, it may be time for this term to enter the public discourse.

To your first question:

The added table was once created for river ecosystem services in urban areas. A lot of them should also be found on lakes, wetland etc. If you go down to the class level, you might be able to derive the benefits of each ecosystem service relatively easily.

Data Supplementary

In urban setup we have very less and sensetive ecosystems which provides a notable ecosystem services, which need to be restored to avail it services in future, as we have seen most degradation in these types of ecosystems in urban set up which in one way or the other disrupt provisioning/supporting/ regulatory/cultural services to the urban resident.

@Wiktor Halecki

Well, it is a good idea. I am also working and framing my work though introduction of greenspace and green roofing along with the buildings and roadsides. It will be a significant criterion that can be helpful to retention of groundwater and reduce UHI as well.

Best wishes with regards

Suraj