20
2 Terminology
needs of the least advantaged must be explicitly one of the objectives of a WUS
and actively pursued to be solved (see Chap. 5 on equity). Of course, there are other
situations that water is diverted illegally, which presents as one of the reasons for
serious implementation of smart systems (see Sect. 3.3).
Two famous undesirables are leaks from water supply systems, and return flows
from irrigated lands. In general, there should be a determined effort by water
managers to reduce them, particularly in water scarce regions. However, it is impossible to reduce them to zero, meaning that their beneficial weights mostly should not
be zero, because they contribute to various water bodies. In other words, not all of
them is Water Loss, because at each moment, it should be assumed that the water
managers are doing their best to minimize them.
Sometimes W b and/or W q make the usefulness of a WPI low, which can give the
idea that ignoring them altogether is good enough. For example, considering all the
pipe leaks non-beneficial, may lead to set their W b to zero. However, there are two
reasons that should motivate us to avoid such a common temptation. First, in-line
with what just mentioned, sometimes there are WPIs that their usefulness is not low,
and therefore excluding them as WL from some considerations is rather premature.
Second, sometimes due to trade-offs of the three Pillars, a small value can lead to
informative influences on the performance of systems as explained in Chap. 4.
Although the nature of all these parts of WL are different, they all convey the
various ways that a WUS makes water undesirable as can be seem from Eq. (2.4).
This is highly important in water scarce regions, having in mind that with lower water
quantity, the impact of pollution is higher. For example, should water, beverage and
other types of companies be allowed to operate in a water scarce region? Should
irrigated lands increase? Chapter 4 and Chapter 5 will respond to these and other
questions by presenting appropriate approaches.
2.5.1 Unrecoverables
One of the interesting expressions emerged from Eq. (2.4) that is particularly important for the sustainable performance of a WUS, such as in Chap. 4, has the following
equation, remembering from Sect. 2.2 that I d – R d = (I – R) d = C d :
WL d = I d −(C + R) d = I d −C d −R d → C d + WL d = I d −R d
This expression is Total Unrecoverable Flow (TUF) along d as given in Eq. (2.5):
TUF d = I d − R d = C d + WL d = C + R nd − I nd , d = b, q, s
(2.5)
Equation (2.5) states that TUF d is the difference between Inflow and Return along
d. It is also the sum of the Consumption and say the differential between non-useful
Return and non-useful Inflow. We can also observe from Eq. (2.5) that as WL d goes
toward zero (one of the important aims of water management) TUF goes toward C.
2 Terminology
needs of the least advantaged must be explicitly one of the objectives of a WUS
and actively pursued to be solved (see Chap. 5 on equity). Of course, there are other
situations that water is diverted illegally, which presents as one of the reasons for
serious implementation of smart systems (see Sect. 3.3).
Two famous undesirables are leaks from water supply systems, and return flows
from irrigated lands. In general, there should be a determined effort by water
managers to reduce them, particularly in water scarce regions. However, it is impossible to reduce them to zero, meaning that their beneficial weights mostly should not
be zero, because they contribute to various water bodies. In other words, not all of
them is Water Loss, because at each moment, it should be assumed that the water
managers are doing their best to minimize them.
Sometimes W b and/or W q make the usefulness of a WPI low, which can give the
idea that ignoring them altogether is good enough. For example, considering all the
pipe leaks non-beneficial, may lead to set their W b to zero. However, there are two
reasons that should motivate us to avoid such a common temptation. First, in-line
with what just mentioned, sometimes there are WPIs that their usefulness is not low,
and therefore excluding them as WL from some considerations is rather premature.
Second, sometimes due to trade-offs of the three Pillars, a small value can lead to
informative influences on the performance of systems as explained in Chap. 4.
Although the nature of all these parts of WL are different, they all convey the
various ways that a WUS makes water undesirable as can be seem from Eq. (2.4).
This is highly important in water scarce regions, having in mind that with lower water
quantity, the impact of pollution is higher. For example, should water, beverage and
other types of companies be allowed to operate in a water scarce region? Should
irrigated lands increase? Chapter 4 and Chapter 5 will respond to these and other
questions by presenting appropriate approaches.
2.5.1 Unrecoverables
One of the interesting expressions emerged from Eq. (2.4) that is particularly important for the sustainable performance of a WUS, such as in Chap. 4, has the following
equation, remembering from Sect. 2.2 that I d – R d = (I – R) d = C d :
WL d = I d −(C + R) d = I d −C d −R d → C d + WL d = I d −R d
This expression is Total Unrecoverable Flow (TUF) along d as given in Eq. (2.5):
TUF d = I d − R d = C d + WL d = C + R nd − I nd , d = b, q, s
(2.5)
Equation (2.5) states that TUF d is the difference between Inflow and Return along
d. It is also the sum of the Consumption and say the differential between non-useful
Return and non-useful Inflow. We can also observe from Eq. (2.5) that as WL d goes
toward zero (one of the important aims of water management) TUF goes toward C.