I am from central Chennai and groundwater level in our area has drastically reduced, wo have to depend on other sources (Lorry and Metro water). Metro water often gets polluted so we are looking for control valve open/close by observing the flow through hand pump before letting it to the sump. The challenge here is metro water line to the sump is some 8 feet deep and we don't have proper provision to get down. Can someone please advice if we can have some control valve above the ground level by any means ?