This study investigates on comparison between the results of analytical and numerical methods, with results obtained from field measurement which have been made, to design and implementation of an excavation dewatering system located in Bushehr, Iran. The purpose is to obtain discharging flow rate from gravity water absorption Wellpoints to decrease the groundwater level at the midpoint to rate of 0.5m lower than bottom of excavation, by changing in parameters, spacing between Wellpoints, Wellpoint distance from wall pit, changing the diameter of the wellpoints, changing in relocations on the borders with fixed head and changes in the permeability of the soil. Based on the calculated flow rate and specific head, two centrifugal pump is designed and field observations show dewatering operation has been done successfully. In an unconfined aquifer, the theoretical analysis for obtaining the discharge of the Wellpoints in stable flow conditions with assumptions of dupuit-forchheimer has been made to solve the differential equation of groundwater in the saturation environment. Numerical simulation in a stable condition using the finite element software seep3d and finite difference software processing mudflow have been done. The diameter and depth of wellpoints parameters are fixed in the case study. Results obtained from geotechnical drilling logs showed that the soil layers in excavation depth, consisting of two layers of silty sand (SM) and clay (CL). Groundwater level at depth of 2.5 meters from the ground. Conducted analysis show that increasing the parameters of the distance between the wellpoints, the permeability of the aquifer and the wellpoints diameter lead to increase in amount of discharge from wellpoints. Although locating wells outside the excavation and farther borders with fixed head, reducing the discharge of the wells. Field pumping test in stable condition shows that flow rate measured by theoretical results, experimentally and numerically have good co