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Okavango Delta Management Plan - Ramsar Convention on Wetlands

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The district is also affected by a number of other diseases. These include malaria, anaemia,<br />

tuberculosis, diarrhoea and sexually transmitted diseases.<br />

2.1.7.9 Safety<br />

The Botswana Police has stati<strong>on</strong>s in Maun, Gumare, Ser<strong>on</strong>ga, Sehithwa and Shakawe.<br />

Maun hosts the district police headquarters. There is also a Botswana Defence Force camp<br />

in Maun. The Botswana Local Police under Tribal Administrati<strong>on</strong> has a wider presence in<br />

the ODRS. The Department of Pris<strong>on</strong>s and Rehabilitati<strong>on</strong> is also present in Maun. In<br />

additi<strong>on</strong> to government safety instituti<strong>on</strong>s, there are several privately owned security<br />

companies.<br />

2.1.7.10 Places of Worship<br />

There are many churches in all settlements in the <str<strong>on</strong>g>Ramsar</str<strong>on</strong>g> site. Some of the well<br />

established churches include the Roman Catholic, Seventh Day Adventist, United<br />

C<strong>on</strong>gregati<strong>on</strong>al Church of Southern Africa (UCCSA), Assemblies of God, Lutheran, Spiritual<br />

Healing, New Apostolic Church and Zi<strong>on</strong> Christian Church.<br />

2.2 PHYSICAL FEATURES<br />

2.2.1 CLIMATE AND CLIMATE CHANGE<br />

The climate within the ODRS is semi-arid with rainfall (in Maun) ranging from 195 to 940<br />

mm per annum. Rainfall occurs in the summer m<strong>on</strong>ths (November to March), with a mean<br />

annual amount of 455 in Maun and 480 mm over the <str<strong>on</strong>g>Delta</str<strong>on</strong>g>. Characteristic of a semi-arid<br />

envir<strong>on</strong>ment, the rainfall is highly variable, with a coefficient of variati<strong>on</strong> of annual rainfall<br />

of 35%. The m<strong>on</strong>thly mean temperature ranges from 16 to 26 ˚C in June and October<br />

respectively. The winds are generally light easterlies. Annual potential evapotranspirati<strong>on</strong>,<br />

(class A pan with appropriate, seas<strong>on</strong>ally varying pan coefficient), is high at nearly 1850<br />

mm.<br />

2.2.2 GEOMORPHOLOGY<br />

The <str<strong>on</strong>g>Okavango</str<strong>on</strong>g> alluvial fan is situated am<strong>on</strong>g dune sediments within the down faulted MOZ<br />

(Makgadikgadi-<str<strong>on</strong>g>Okavango</str<strong>on</strong>g>-Zambezi) basin of north-west Botswana. The <str<strong>on</strong>g>Okavango</str<strong>on</strong>g> fan has<br />

developed <strong>on</strong> flat terrain within a south-western extensi<strong>on</strong> of the East African rift (EAR)<br />

which was re-activated approximately 2.4-5.0 milli<strong>on</strong> years ago al<strong>on</strong>g a NE-SW directi<strong>on</strong><br />

(Kampunzu et al., 1998; Tercillin and Lezzar, 2002). The surface of the down-faulted area<br />

comprises washed l<strong>on</strong>gitudinal dunes, with current and relict alluvial fan deposits and salt<br />

pans which overlie up to 300 m of predominantly sandy sediment. Catchment<br />

headstreams include the <str<strong>on</strong>g>Okavango</str<strong>on</strong>g> River which flows through Namibia to the Panhandle.<br />

The <str<strong>on</strong>g>Okavango</str<strong>on</strong>g> <str<strong>on</strong>g>Delta</str<strong>on</strong>g> is in reality the wetter part of an alluvial fan that is slightly c<strong>on</strong>ical<br />

and which disburses south of the Panhandle after flowing over 1000 km through Angola,<br />

Namibia and Botswana.<br />

In terms of gross fluvial sub-envir<strong>on</strong>ments, the quasi-level <str<strong>on</strong>g>Okavango</str<strong>on</strong>g> alluvial fan comprises<br />

a mosaic of meandering watercourses, floodplains and islands, and is subject to low<br />

velocity flooding (ca. 2-3 cm/s) with significant lateral groundwater discharge under the<br />

islands and shoreline. The present <str<strong>on</strong>g>Delta</str<strong>on</strong>g> c<strong>on</strong>sists of seven active (slowly diffusing) and<br />

intermittently active distributary floodplain systems with a total east-west extent of c. 140<br />

km. The distributi<strong>on</strong> of flow through the 1-500 m wide floodplains varies with decadal or<br />

biannual frequency (Wolski and Savenjie, 2006).<br />

22

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