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When Dr = 0, which means that the height of emissions above the floor equals the effective depth of the pit, the effective area is equal to the total area of the mine opening (i.e. Ae=1.0).

Having determined the effective area from which the model will simulate the pit emissions, the specific dimensions of this effective rectangular area are calculated as a function of θ such that (see Figure 1-10):

and

Note that in equations 1-75 and 1-76, W is defined as the short dimension of the pit and L is the long dimension; AW is the dimension of the effective area aligned with the short side of the pit and AL is the dimension of the effective area aligned with the long side of the pit (see Figure 1-10).  The dimensions AW and AL are used by the model to define the shape of the effective area for input to the area source algorithm described in Section 1.2.3.

The emission rate, Qe, for the effective area is such that

where Qa is the emission rate per unit area (from the pit after adjustment for escape fraction) if the emissions were uniformly released from the actual pit opening (with an area of L×W).  That is, if the effective area is one-third of the total area, then the emission rate (per unit area) used for the effective area is three times that from the full area.

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