Erosion response model for watershed prioritisation in Bajaj sagar sub catchment


Results
The process of prioritisation requires integration of all the themes and coding the watershed for priority. Higher the sum weight, more is the priority of watershed. As per the coding the watersheds were prioritised as highly critical, critical,, low critical and not critical. The table 1 shows the ERM priority for the watersheds.


Table 1 : Priority code of the watersheds
Watershed Name Sum of wt for
March'93 data		 Sum of wt for
Oct' 94 data		 Averageweight Priority
5E2C1 Erau 15 16 15.5 Highly critical
5E2C2 Bhunan 14 14 14 Critical
5E2C4 Telni 11 11 11 Not critical
5E2C5 Pampawa 9 12 10.5 Not critical
5E2C6 Bageri 13 14 13.5 Critical
5E2C7 Mahi 12 12 12 Low critical


Results of prioritisation of all the seven water-sheds of Bajaj Sagar dam sub-catchment, based on satellite data of October 1994 and March 1993 have been given in the figure. The watersheds of the sub-catchment are forested watersheds hence the response from the watersheds will be almost similar for different seasons. Seasons do not have a major influence on the response. The figure 3 shows the prioritised watersheds sub catchment area . From the figure it is clear that one of the three direct draining watersheds is in highly critical category and the other is critical. direct draining watersheds have very high priority. This is also justified by the fact that these watersheds will give more silt load to the reservoir. Form factor and slope are other prominent factors affecting the priority.


Figure 3 : Prioritised watersheds

References
  • Manavalan P., Krishnamurthy et.al., Watershed Response Analysis Using digital data integration technique, in :Adv. Space Res. Vol 13, No. 5, pp. 177-180, 1993


  • Sharma S.A., Bhatt H.P. and Ajai, Generation of Brightness and Greenness Transformations for IRS LISS II data, in : Photonirvachak, vol 18, No 3, pp 25-311 1990


  • All India Soil and Landuse Survey AIS & LUS Technical Bulletin 9 1991, Methodology of Priority Delineation Survey


  • A project report on ""Sedimentation Analysis of Mahi Bajaj Sagar reservoir using Satellite Remote Sensing". 1997, RRSSCJ/CWC


  • A project report on "Watershed Prioritisation Using Remote Sensing and GIS for Bajaj Sagar dam sub catchment (Mahi basin), RC] : 07.1/PR/98/3
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