variation of runoff between two well jointed terrains composed of well jointed limestone & massive quartzite respectively

Limestone is sedimentary rock formed from carbonate minerals especially calcite & dolomite.Quartzite is a hard,impermeable whitish or greyish quartzite rock cemented by silica.From the above question it can be derived that there is uniformity of structure in the two cases.In case of limestone terrain ,the rain water will form surface drainage and start dissociating the terrain.

the rain water has formed carbonic acid,a weak aid but strong enough to dissolve calcium carbonate.Surface drainage dissapears underground due to formation of sink holes & swallow holes.Underground caves and caverns come into existence which collapses & erodes down forming a peni plain like surface with drainage reappearing on the surface as surface drainage.

There is loss of water to groundwater which is evident from the fact that hard ground water prevails in limestone aquifers.Portion of the water is found in springs.Formation of limestone channels,closed depressions etc. form supplies for round water where it remains high.

In case of quartzite terrain,the surface runof forms the major portion of the total runoff since there is no thorough flow and it is expected that the ground water level will also be very low below a quartzite terrain.

Hence,from the analysis of the two terrains it can be concluded that in limestone area there has been infiltration losses but there has been no infiltration water reaching the ground water table in case of quartzite terrain.

In the quartzite terrain there is predominance of overland flow component of runoff.Predominance of overland flow also increases evaporation losses as more surface area under overland flow also increases evaporation losses as more surface area under overland flow is exposed (as we know increased surface area means increased evaporation rate).aoding to the amount of water the drainage pattern will depend.