Wetland & Fish Ecology - Enviro Dynamics Namibia
Wetland & Fish Ecology - Enviro Dynamics Namibia
Wetland & Fish Ecology - Enviro Dynamics Namibia
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68<br />
to rural people<br />
A. Introduction of<br />
Kunene river<br />
species<br />
Not encouraged in<br />
conservation nor health<br />
terms, but already<br />
occurring and can<br />
enhance fishery<br />
N P SER<br />
-M or<br />
+ M<br />
H<br />
Ong<br />
Can be avoided by<br />
careful construction<br />
and operation in<br />
cooperation with<br />
NamWater<br />
(responsible)<br />
Take care to avoid<br />
mixing of Kunene<br />
supply water with<br />
oshana floodwaters<br />
diverted around town<br />
L<br />
A + B<br />
Changed<br />
dynamics<br />
flood<br />
Lower fish catches in<br />
wetlands, affecting<br />
fishermen negatively<br />
R LT MOD<br />
-M<br />
M<br />
Ong<br />
<strong>Fish</strong> catches not<br />
affected by dike<br />
project<br />
Operate sluices to keep<br />
flood dynamics, peak<br />
and duration, within<br />
natural flow range,<br />
through & around<br />
Oshakati town<br />
L<br />
ISSUE<br />
3.4<br />
CONTINUED<br />
POTENTIAL IMPACT UNMANAGED<br />
MANAGED IMPACT<br />
POTENTIAL IMPACT EXT DUR INT SIGN MANAGED IMPACT MITIGATION SIGN<br />
UNMANAGED<br />
A,B<br />
Hardening of sides<br />
of dike next to<br />
channel and lining<br />
of Okatana canal<br />
No vegetation on<br />
hardened channel sides<br />
or allowed to grow in<br />
lined canal<br />
L LT MOD<br />
-L<br />
L<br />
Ong<br />
Normal vegetation<br />
cover for aquatic life<br />
Use hollow bricks in<br />
place of solid concrete<br />
apron/gravel<br />
Replace substrate over<br />
lining or allow sediment<br />
to collect<br />
L<br />
B. Sedimentation<br />
due to deepening<br />
Smothering of benthic<br />
organisms and removal<br />
L ST MOD M Reduce intensity and<br />
duration of impact<br />
Construction and<br />
excavation sensitive to<br />
L<br />
Draft <strong>Enviro</strong>nmental Impact Assessment: Oshakati Flood Mitigation Project<br />
Specialist Study: <strong>Wetland</strong> <strong>Ecology</strong> and <strong>Fish</strong> <strong>Ecology</strong> Imputs<br />
July 2012
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