12 Water Management Policy for Freshwater Security …
261
V mobilized =
Q 0
k
The Maillet model makes it possible to determine the temporal evolution of depletion coefficients and water volumes mobilized by aquifers in the Gambia watershed,
and to assess the duration of the drying up of rivers under the effect of climate change,
enabling the use of methods based on trend detection and break in series.
3.1.5 Pettitt and Mann–Kendall Tests
The Pettitt test (1979) represents a break at an unknown moment in series from a
formulation derived from that of the Mann–Whitney test. This test represents differences in values that make up the sample, corresponding to a resulting time series. The
calculation of the p-value indicates whether or not the threshold break is statistically
significant.
The Mann–Kendall test represents the linear trend (up or down) within a time
series. This tendency test was first studied by Mann (1945), then Kendall (1975),
then improved by Hirsch and Slack (1984). The test has been validated by several
comparison studies by Yue and Wang (2004).
3.2 Characterization of Water Policy in a Climate Change
Context
Data and information from various institutions were selected based on the institution’s mandate for water policy, security/water management and/or climate change.
Among the institutions and ministries from which data were derived are the Ministry
of Hydraulics and Sanitation, the Ministry of Environment and Sustainable Development, the Directorate of Management and Planning of Water Resources, the National
Agency of Civil Aviation and Meteorology, the National Agency of Statistics and
Demography, the Organization for the Development of the Senegal River and the
National Water Company of Senegal. Some semi-structured interviews of key players
were conducted to complement policy analysis. Data were sourced mainly from
the documentary/policy reviews of selected institutions. Institutional documents,
progress reports and institutional water resource management libraries were used
to gain a deeper perspective on water policy and water security in the context of
climate change. The analysis focuses on water security, water resource management
and climate change.
261
V mobilized =
Q 0
k
The Maillet model makes it possible to determine the temporal evolution of depletion coefficients and water volumes mobilized by aquifers in the Gambia watershed,
and to assess the duration of the drying up of rivers under the effect of climate change,
enabling the use of methods based on trend detection and break in series.
3.1.5 Pettitt and Mann–Kendall Tests
The Pettitt test (1979) represents a break at an unknown moment in series from a
formulation derived from that of the Mann–Whitney test. This test represents differences in values that make up the sample, corresponding to a resulting time series. The
calculation of the p-value indicates whether or not the threshold break is statistically
significant.
The Mann–Kendall test represents the linear trend (up or down) within a time
series. This tendency test was first studied by Mann (1945), then Kendall (1975),
then improved by Hirsch and Slack (1984). The test has been validated by several
comparison studies by Yue and Wang (2004).
3.2 Characterization of Water Policy in a Climate Change
Context
Data and information from various institutions were selected based on the institution’s mandate for water policy, security/water management and/or climate change.
Among the institutions and ministries from which data were derived are the Ministry
of Hydraulics and Sanitation, the Ministry of Environment and Sustainable Development, the Directorate of Management and Planning of Water Resources, the National
Agency of Civil Aviation and Meteorology, the National Agency of Statistics and
Demography, the Organization for the Development of the Senegal River and the
National Water Company of Senegal. Some semi-structured interviews of key players
were conducted to complement policy analysis. Data were sourced mainly from
the documentary/policy reviews of selected institutions. Institutional documents,
progress reports and institutional water resource management libraries were used
to gain a deeper perspective on water policy and water security in the context of
climate change. The analysis focuses on water security, water resource management
and climate change.