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An Empirical Assessment of On-Farm Water Productivity using Groundwater in a Semi-Arid Indian Watershed

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Abstract

Realistic estimation of irrigation volume applied to any crop at farm level generally requires information on event based discharge rates and corresponding periods of irrigation application. Use of mean seasonal discharge rates leads to erroneous estimation of volume due to unaccounted seasonal fluctuations in the water table, upon which the discharge rate of tube well is dependent. In the absence of such information, an alternative approach of estimating farm level water application based upon water table fluctuation data has been adopted in this study. The total actual water extracted during each irrigation event from the watershed was distributed among the farms irrigating crops in proportion to the product of irrigation time and the pump capacity (hp). Volume of water withdrawal concurrent to an irrigation event was computed based on the water level fluctuations in the wells in conjunction with potential recharge contribution from the surface storage structures to the groundwater aquifer. A production function approach was used to estimate the marginal productivity of water for selected crops at various stages of plant growth. Water, as an input in the production function, encompassed either in-situ soil moisture storage from rainfall or irrigation from groundwater or both. The inter-season as well as intra-season groundwater use, and the consequent groundwater withdrawals were analyzed based on the marginal value and output elasticity of water at different crop growth stages during the season. The cotton crop realized marginal value product of water, ranging from Rs. 1.03/m3 to Rs. 10.43/m3 at different crop growth stages in cotton. Castor crop had the marginal value product ranging from Rs. 2.89/m3 to Rs. 6.81/m3. The availability and use of water, including soil moisture, in the two seasons, coupled with the local harvest prices received, yielded the differential marginal values of water.

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Abbreviations

\( {\text{W}}_{\text{ij}}^{\text{k}} \) :

Groundwater applied on ith farm to jth crop at kth stage (m3)

σ :

Marginal value product of water (Rs-m−3)

\( {\text{V}}_{\text{wij}}^{\text{k}} \) :

Water received from rainfall and used by the jth crop on ith farm at kth crop growth stage (m3)

A:

Area of watershed (m2)

a:

Constant term of the production function (.)

bi :

Coefficient of parameters associated with log value of the variable ‘i’ in the production function (.)

ci :

Coefficient of parameters associated with squared log value of the variable ‘i’ (.)

di :

Coefficient of parameters associated with interaction of log values of the variable ‘i’ and ‘j’ (.)

AMC:

Antecedent Moisture Condition (.)

CN:

Weighted curve number for the watershed (.)

Ep :

Elasticity of output (.)

f(.):

Functional attribute of the independent variables to the production function (Kg)

H:

Head of operation (m)

hp :

Horse power of motor (hp)

hpi :

Horse power of motor on ith farm (hp)

ht :

Depth to water table at any day ‘t’ (m)

ht’:

Depth to water table at any day ‘t’ in absence of any withdrawal or potential recharge (m)

ht−1 :

Depth to water table at any day ‘t-1’ (m)

i:

Subscript indicating individual farm (.)

j:

Subscript indicating individual crop (.)

k:

Subscript indicating crop growth stage (.)

Nf :

Number of farms applying irrigation on any irrigation event (No.)

P:

Rainfall (mm)

PY :

Farm harvest price of final output (Rs- kg−1)

Q:

Discharge rate (m3-sec−1)

Qi :

Discharge rate of the pump on ith farm (m3-sec−1)

Re :

Potential recharge from the water storage structures (m3)

Ro :

Runoff from the field (mm)

S:

Storativity of the aquifer (.)

SGVP:

Standardized Gross Value Production (Kg)

ST :

Maximum potential storage of the watershed (mm)

t:

Irrigation event date (day)

ti :

Irrigation event date of ith farm (day)

TL :

Lag time for potential recharge from surface storage structures to reach the groundwater table (day)

TW:

Total water applied in irrigation from rainfall and groundwater sources (m3)

TWk :

Vector input of water applied at stage ‘k’ of crop growth (m3)

TWij k :

Total water applied to a crop ‘j’ grown on farm ‘i’ at growth stage ‘k’ (m3)

TWG :

Total volume of water withdrawal from groundwater sources (m3)

TWt1 :

Actual total groundwater withdrawal under case 1 (m3)

TWt2 :

Actual total groundwater withdrawal under case 2 (m3)

Vwj :

Rainfall volume added to soil profile (m3)

W1,W2, W3, W4 :

Water applied at crop growth stages 1, 2, 3, and 4, respectively (m3)

X1 :

Variable ‘Energy’ (KWh)

X2 :

Variable ‘Land’ (acres)

X3 :

Variable ‘Input’ (kg)

Xs :

Input vector other than water (.)

Y:

Yield output vector (Kg)

γ:

Specific gravity (kg-m−3)

η:

Pump hydraulic efficiency (.)

α:

Constant (m2-kg−1)

δ:

Marginal physical product of water (Kg-m−3)

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Acknowledgements

The fund provided by the Department of Land Resources, Ministry of Rural Development, Government of India for the execution of various interventions in the study watershed is thankfully acknowledged. Thanks are also due to the scientists of the Research Centre who assisted in the analysis of voluminous data. The authors thank Sh. C.N. Damor and Mr. M. J. Baraiya, Technical officers of CS&WCR&TI, Research Centre, Vasad for their assistance in collection of data during the study period.

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Pande, V.C., Sharda, V.N., Kurothe, R.S. et al. An Empirical Assessment of On-Farm Water Productivity using Groundwater in a Semi-Arid Indian Watershed. Water Resour Manage 26, 475–498 (2012). https://doi.org/10.1007/s11269-011-9927-6

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