Saeed Mosmar Alawad, Saeed 
developed new drainage channels that not found in 1973 (Figures 4,5). The drainage density in the study area has 
increased profoundly from 0.0963 Km/Km2 in 1973 to 0.2176 Km/Km2 in 1993 with an increasing rate of 126%. 
Fig.. A:Drainage density-Gedaref region (1973 ) 
Fig. 5.Drainage density - Gedaref reglon (1993 ) 
  
  
  
MAP LEGENO 
e ' international bouadacy 
e Town 
ere Railway line 
R Jebel and outcrops 
-^ Main river 
«-_~ Seasonal stream (khor) 
  
Source Landsat image interpretation, dated (1973) 
  
  
  
  
  
  
  
MAP LEGEND 
>... international boundry 
e Town 
epp Rattway line 
- Jebel and outcrops 
^ Main river 
PY d Seasonal siream ( khor) 
Source:Landsat image interpretation dated (1985). 
  
  
  
  
  
  
  
  
  
  
The 1973 images show slight degradation rate, while the 
degradation rate. The degradation range between slight to high. 
Fig..6:Present degradation/erosion rate. Gedaref region 
(1993) 
1993 map (Figure 6) shows substantial increases in 
  
  
14 
  
MAP LEGEND 
e Town 
——— Railway Ime 
~~ Main river 
vr Seasonal stream 
  
7*9  intérnatonal boundary 
em Jebel and outcrops 
    
Source Landsat image Interpretation dated(1985)and fieldwork(1987) 
M 2 
X (unn “ 
- 
sn ds 30 
A 
dr 
2 d 
3 
. 
-—— ta 
- 
60 
Km 
EROSION RATE 
None to slight 
Modrate 
High 
Very high 
  
  
  
  
  
  
  
  
  
1298 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000.