"Legal & General is well-placed to continue to develop a product suite that includes good-value drawdown and protection against longevity risk as well as provision of investment income," it said.
High values for drawdown and low recovery transmissivity values were observed in areas where the shallow water level was less than 5 m and where the shallow well depth was less than 10 m.
Low values for drawdown indicate the potential aquifer condition, and high values indicate poor aquifer condition.
However, using (Theta _{p,0}=0.8) is a realistic value for the drawdown criteria in many practical situations.
The optional value of each drawdown constraint was 2 m, which was specified at the same location of the minimum head constraints.
Besides, to understand the aquifer disturbance and deviation in the observed drawdown values, the APE software provides automated values for the least-squares fit of the well yield and transmissivity, storage coefficient and average drawdown error by sensitivity analysis (McElwee 1980a, b).
The southern and southwestern sides, and a part of northeastern side, had low drawdown values that were less than 50 m2/dandand recovery transmissivity values that were higher than 100 m2/day (Fig. 5a, b).
The drawdown values ranged from 3.20 to 24 m.
The measured drawdown values in the different observation wells reveal an anisotropic or elliptically-shaped pumping cone.
The WFT data analysis can also be used to assess mobility values from the drawdown, the buildup or both, based on analytical solutions of the diffusivity equation initially developed for the well test analysis.
Drawdown time values determined for surface additions followed the same trends reported for traditional impellers.
