Is measurement for payment of underground pipelines constructed in place in hilly terrain generally based upon true length of the pipe laid or horizontal projected length (station lengths)?

b) Dewatering is a term to describe the removal of groundwater or surface water from for example a construction site. In construction the water is pumped from wells or sumps to temporarily lower the groundwater levels, to allow excavation in dry and stable conditions below natural groundwater level. Discuss the following types of dewatering methods normally employed during construction of a building project: I. Open sumps and ditches  II.    Well point systems  III.   Deep well drainage