485
Boundary
Boundary
Road
toad
site
;entre - ( City )
) 60Kms
Line
Figure 2- Monthly temperature ana
raintall data of Bagamoyo area 1978 ,1981 & 1984
moyo
irial photo-
ire a Vi'as
le on ove-
L n 1966.
Lte the fact
:>il survey
iat diffe-
; photogra-
,md on the
se and ve-
ince 1966
taken).
v as quite
Lmatt photo-
In total
nple ting
;s were
jrial-photo-
t of scale
1H00,000 was used as base map for establi
shing landscape boundaries. Also a contour
map was jointly used to delimit the lands
capes.
2.2. Reconnaissance field survey
A one day reconnaissance survey was condu
cted to the farm area inorder to i aniilia-
lize with the landscapes and thus access
the soils occuring in different parts of
the farm. During the survey the following
factors were observed.
1. The area was found to be in accessi
ble due to tall grass vegetation (elephant
grass). These occupied the whole flood
plain area. On the coastal plain, woodland
with bushes and thorny tall trees were
the main vegetation. The floodplain area
also had some abandened water logged mars
hes.
2. The vegetation being tall thorny
trees and thick bushes, intensive ground
clearing was necessary to enable the crew'
to move freely through the farm.
3. All parts of the project area were
inhabited by wild animals and reptiles
thus an experienced game scout was needed
to safeguard the team during the exercise 0
2.3. Aerialphoto Interpretation
Physiographic analyses method (FA0, Goosen
D.I967) was used in mapping the units.
Photo elements which were considered most
were relief drainage pattern, vegetation,
and colourtone (grey tone). During field
work the mapping units were further ins
pected to check soils boundaries as well
as the interpretation. The map unit bou
ndaries were finaly transfered to a topo
graphical map of scale 1:100,000 by hand.
Two mainlandtypes were mapped from the
photos.
1. The Alluvial flood plain - (a)
The topography is generaly nearly level
and flat but with local scars and meanders
of ponded marshes. On the photographs
the unit was charcterized by dark tone
depicting of wetness on the ground (caused
by flooding). The vegetation was chara
cterised by tine texture of grass vegeta
tion.
2. The Coastal plain (C)
The topography is gently undulating to
undulating with few defined inter mittent
stream valleys which enter the alluvial
flood ¡»lain. The woodland vegetation was
visualized on photos by coarse light grey-
t one .
2.4. Legend
The legend reflects the kind of survey
which has been made. As has been dismissed
previously, the boundaries between mapping
units were established by topographical
features observed on the photographs and
