Identification of Surface Water Harvesting Sites for Water Stressed Area Using GIS: A Case Study of Ausgram Block, Burdwan District, West Bengal, India - Management of Natural Resources in a Changing Environment - page 83

According to Raisz and Henry method present study area is divided into five
slope category zones i.e. <10′, 10′-20′, 20′-30′, 30′-1° and >1°. In this study area
maximum slope is found in the south west central part and minimum slope is found
in the north east and south east parts. First category, <10′ slope is distributed in
north east and south east parts of study area. It covers 28 % of the total area. Second
category 10′-20′ slope zone is distributed in south and north parts of the study area
and covers maximum area, about 52 % of the total area. Third category, 20′-30′
slope zone is distributed in central, central east and west parts of the study area. It
covers 13 % of land of the total study area. Fourth category zone, 30′-1° is distrib-
uted in west central and north central parts of study area. It covers 5 % of the land
area. Last category, more than 1° slope zone, is distributed in south west central and
north west central parts of the study area. It covers 1 % of land. Generally slope is
from west to east and from south west to north east direction (Fig. 5 ).
This slope is controlling the nature and distribution of surface water resources.
Where the slope is <30′ in the Ausgram block, those parts have lots of surface water

SLOPE (Raisz and Henry Method)
Ausgram Block I & II Burdwan District

N

23 35'N

Slope in (Degree)

23 30'N

> 1D

30 ' - 1D
20 - 30 '
10 - 20 '

< 10 '

60

51.72

50

23 25'N

40
30
20
10
0

28.11

13.04

Slope(Degree)
<10 '

Area in Sq.
Km

Area in %

5.88

1.25
> 10

138.60 28.11

31.72
13.04
05.88
01.25

10−20 '
20−30 '
30 ' −1
>1

255.30
064.31
029.32
004.97

<10' 20 - 30'

10 - 20' 30' - 10

Slope (Degree)

0 4 8 Km

87 35'E 87 40'E 87 45'E 87 30'E

Fig. 5 Slope map ( Source : 73 M/10, 11, 14 & 15)