The calculation of tourist demand per Demand Centre uses the following formula:
| TWD | = | BU * (twdb * 30 / 1000) * OR / 100 |
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with |
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| TWD | = | Tourist Water Demand (m³/month) |
| BU | = | number of Bed Units |
| twdb | = | Tourist water demand in litre per bed unit per day |
| 30 | = | factor to convert from day to month |
| 1000 | = | factor to convert from litre to m³ |
| OR | = | Occupancy Rate in % |
| 100 | = | factor to convert from Percentage to fraction |
In the above formula, the number of bed units, the occupancy rate and the tourist water demand in litre per bed unit will change for future scenarios. While the occupancy rate and the tourist water demand in litre per bed unit are set manually, for the number of bed units the general concept of growthrate and migration is valid again.
Thus, the number of bed units is calculated as follows:
| Bn | = | Bb * (1 + G / 100)N + S |
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with |
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| Bn | = | Bed units at the new year |
| Bb | = | Bed units at the previous time step |
| G | = | yearly Growth rate in % |
| 100 | = | factor to convert from percentage to fraction |
| N | = | N = (2005 - reference year), for the next steps: N= 5 ( 2010, 2015 etc.) |
| S | = | sudden increase/decrease of bed units |