Ramganga Sub-Basin Analysis

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1. Ramgnaga sub-basin description
Ramganga is the first major tributary that joins to the Ganga with a catchment area of 32,768 km2. Ramganga rises at an altitude of about 3,110 m in the lower Himalayas near the Lohba village in the Garhwal district and enters the plains at Kalagarh near the border of the Garhwal district of Uttar Pradesh. Then, the river flows in a southeasterly direction and finally joins the Ganga on its left bank near Kanauj in the Fategarh district. The river flows entirely in the states of Uttaranchal and Uttar Pradesh with a total length of 595 km. The important tributaries that join the RamgangaRiver are the Kho, the Gangan, the Aril, the Kosi, and the Deoha (Gorra).

The topographic elevation in Ramganga sub-basin
…show more content…
The post-monsoon water levels are relatively shallower than pre-monsoon. However the range of the depth of water levels almost follows the pre-monsoon trends. The spatially distributed groundwater recharge from 1996 to 2011 indicated that average recharge is about 1.6 m in the area (fig. 4a) and that range from 0.01 m to 18 m. The groundwater recharge in the central part of the Bariley district is 2.5 -3.5 m and in the foot hills of Ninatal district is range from 3-19 m. The groundwater recharge in the 80% of area is range from 1-2 …show more content…
However, small groundwater depletion (relatively low) are observed over the time period from 1996 to 2011 in the pre-monsoon water levels. Overall, the general groundwater levels are in decreasing trend. The sharp decreasing trend of groundwater levels between 2005 to 2007 is attributed to massive expansion of irrigation and low rainfall in the area that leads to temporal groundwater depletion .

The groundwater flow direction in Ramganga is consistently following surface water flow direction (Figure. 4b). The long term average groundwater contours (for pre-monsoon) in msl are shown in figure 3b. The tendency of contours towards the rivers/streams indicated that continuous and greater interaction between river and groundwater aquifer. The groundwater velocity vectors indicated that aquifers feedthe rivers in non-monsoon season (Figure 4b).

4.2 Regression analysis
The multi linear regression model was used for post-monsoon recharge, topographic elevations and pre-monsoon water level. The regresson model indicates that 59% of the variation in the post-monsoon recharge was well explained with the two variables, i.e. topographic elevations and Pre-monsoon water levels (R2 0.593). The results are shown in table

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