# Aufgabensammlung Numerische Methoden. Aufgaben by Hagander N., Sundblad Y.

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54b) This is the standard two-dimensional regional groundwater ﬂow equation. From this outline derivation, it is clear that vertical components of ﬂow are a fundamental part of this equation. 26 Diagram illustrating how vertical ﬂow components are implicitly contained in the two-dimensional regional groundwater ﬂow formulation two-dimensional form of the groundwater ﬂow equation is not appropriate. 0 km grid. 27a. Note in particular, 1. the aquifer has a slight slope to the right, elevations of the base of the aquifer (45, 44, 43 and 42 m) are given at 1 km intervals, 2.

7. Strictly the phrase hydraulic conductivity should always be used but in groundwater hydraulics and soil mechanics the word permeability is often used as an alternative; in the remainder of this text these words are considered to be interchangeable. 4a. However, account must be taken of the fact that the aquifer contains both solid material and water, hence it is necessary to multiply the decrease in volume due to the water table fall by the speciﬁc yield, SY. The speciﬁc yield is deﬁned as follows: The volume of water drained from a unit plan area of aquifer for a unit fall in head is SY Speciﬁc storage: a fall in groundwater head within a saturated aquifer also causes a reduction in pressure within the aquifer system (Eq.

See, for example, McWhorter and Sunada (1977), Bouwer (1978), Todd (1980), Driscoll (1986), Walton (1991) and Fetter (2001). 4 Deﬁnition of storage coefﬁcients The change in groundwater head with time results in the release of water from storage or water taken into storage. Two mechanisms can apply; the release of water at the water table due to a change in the water table elevation and/or the release of water throughout the full depth of the aquifer due to a change in groundwater head which corresponds to an adjustment of the pressure within the aquifer system.