BASANIA HEP_PFR - Ministry of Power

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uS'kuy gkbMªksbySfDVªd ikoj dkjiksjs'ku fyñ 5.2.3 SURFACE WINDS Preliminary Feasibility Report Basania HE Project 3 X 30 MW The wind velocity is not very much high. The maximum wind velocity is 7.3 km/h in the month of June. Wind velocity remains relatively high in the months of May to August. Wind velocities recorded at Mandla, Jabalpur and Umaria are shown in Table 5.4. 5.2.4 EVAPORATION The evaporation losses for the proposed reservoir has been observed as 999.41mm per year on the basis of 1982 to 1987 monthly potential evapotranspiration data of Manot, which is about 5 km upstream of proposed dam site, shown in Table 5.5. 5.3 WATER AVAILABILITY STUDY 5.3.1 DATA AVAILABILITY River flows have been measured at different G&D sites by CWC and state government of Madhya Pradesh, on Main River Narmada and its tributaries. Daily discharge data is available at following relevant G&D sites: - 1. Manot G&D Site: The G&D site is about 5Km upstream of proposed dam site Basania, on Main River Narmada, catering to a catchment area of 5025 km 2 . The daily discharge data is available from Jun89 to May99. 2. Mohgaon G&D Site: The G&D site is about 16Km upstream of confluence, on River Burhner, a tributary of Narmada, catering to a catchment area of 4090 km 2 . The location of confluence is about 3km upstream of proposed dam site Basania. The daily discharge data is available from Jun89 to May99. 5.3.2 PREVIOUS STUDY (MPEB) Annual runoff series from 1891 to 1967 at proposed dam site Basania was derived from weighted average annual rainfall of the proposed catchment using rainfall-runoff relationship at Jamtara, which is 128km downstream of Basania. NH/CON/229 25 01/2004
uS'kuy gkbMªksbySfDVªd ikoj dkjiksjs'ku fyñ Preliminary Feasibility Report Basania HE Project 3 X 30 MW This Annual runoff series is enclosed as Annexure 5.2. The average annual yield computed as 5628.54 M cum. The average specific yield thus corresponds to 0.59 cumec/sq.km. 5.3.3 PRESENT STUDY (NHPC) Present study has been done on the basis of available hydro meteorological data depicted in Annexure 5.1. No gauge and discharge is available / observed at proposed dam site. Therefore, Average 10-daily discharge series have been obtained at Manot G&D Site (1988-1999) and Mohgaon G&D Site (1988-1999), based on above mentioned daily discharge data obtained from CWC. These 10- daily discharge series are enclosed as Annexure 5.3 and Annexure 5.4. As sum of catchment areas of Manot G&D Site and Mohgaon G&D Site is 9115 sqkm, which is nearly equal to the catchment area 9472sqkm up to the proposed dam site Basania. Therefore, a conservative estimate of average10-daily discharge series at the proposed dam site Basania for the period 1988-1999 was derived by summing up average10-daily discharge series of Manot G&D Site and Mohgaon G&D Site. This 10-daily discharge series is enclosed as Annexure 5.5 & Figure 5.4. There is wide variation in discharge. The average annual yield thus computed as 5389.19 M cum. The average specific yield thus corresponds to 0.57 cumec /sq.km. 5.4 RESERVOIR ELEVATION AREA CAPACITY CURVE The reservoir elevation-area-capacity curve at Basania site has been obtained from existing report prepared by MPEB. The volume between any two elevations has been calculated using conical formula: V = {A1+(A1A2) 0.5 +A2}*(H/3). Where V = the volume between two contours H = Contour interval/difference in elevation A1 = Area at level of first contour/elevation A2 = Area at level of first contour/elevation The incremental volumes thus obtained are added to obtain cumulative volume. The gross capacity of reservoir at proposed FRL 482 m is 1848.94 Mcum. The NH/CON/229 26 01/2004
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BED LEVEL IN FEET 3600 1600 1200 40
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23°0` 22°15` 22°0` 80°15` 23°1
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1000 THICK DUMPED RIP RAP MDDL EL 4
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BASANIA HEP_PFR - Ministry of Power

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