Name: FINANCIAL JUSTIFICATION AND ECONOMICS OF CANAL LINING
Uploaded: 2022-11-03
Duration: 7 min 8 s
Description: FINANCIAL JUSTIFICATION AND ECONOMICS OF CANAL LINING.

FINANCIAL JUSTIFICATION AND ECONOMICS OF CANAL LINING. 

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FINANCIAL JUSTIFICATION  AND ECONOMICS OF CANAL LINING

PRESENTED                      				BY              Er. VENKATA RAJU BADANAPURI 						B.E., M.Tech (Stru)., C.E (India)., F.I.E.,            			 Executive Engineer   			 Water Resources Department 		 Government of Andhra Pradesh

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FINANCIAL JUSTIFICATION AND ECONOMICS OF CANAL LINING

In certain cases, the lining of a channel may be required from purely  technical considerations .  For example, a canal constructed on a high fill or a canal founded  partly on  rock and partly on permeable strata, may be unsafe, unless it is lined. Sometimes  a  hard lined  surface may be required to, withstand the high flow velocities, as in  power channels. Apart from these special circumstances, the engineer is required to produce  a good  economic justification for the capital outlay that is likely to be invested on lining.

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In considering the economy of canal lining, it is necessary to evaluate the  tangible ( which can be measured in terms of money) and additional benefits, and then to  compare these  with the cost of lining . Benefit cost ratio can, therefore, be worked out, so as to justify the necessity of lining . Mathematically speaking, expenditure on a project is justified if the resultant  annual benefits  exceed the annual costs (including interest on the capital expenditure)  i.e., Benefit  cost ratio is more than one.

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The justification for lining the existing channels is different from that of constructing new lined  channels  in a new project.  It  is because of the fact that a large number of additional  advantages ;  such as  lesser earth  work handling, lesser  land acquisition, lesser impounding reservoir  capacities , etc., are obtained in a new project, by adopting lining for new canals .

JUSTIFICATION FOR LINING THE EXISTING CANALS. . 

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JUSTIFICATION FOR LINING THE EXISTING CANALS

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JUSTIFICATION FOR LINING THE EXISTING CANALS. ANNUAL COSTS:- In addition to the benefits grouped above i.e., (water saving and reduction in maintenance cost) there may be benefits, like prevention of water-logging , reduced cost of drainage for adjoining lands, reduced risk of breaching, reduced incidence of malaria and other diseases in damp areas. Actual evaluation of these benefits is very difficult and may be approximated, based on experience, and may be taken into account for evaluating the annual benefit cost ratio.. 

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ANNUAL COSTS:- In  addition to the benefits grouped  above i.e.,  (water  saving and  reduction  in maintenance  cost) there may be benefits, like prevention of  water-logging , reduced cost  of drainage  for adjoining lands, reduced risk of breaching, reduced incidence of  malaria and  other diseases in damp areas. Actual evaluation of these benefits is very  difficult and  may be approximated, based on experience, and may be taken into account  for evaluating  the annual benefit cost ratio.

ECONOMIC ANALYSIS OF IRRIGATION CANAL LINING. Example :- An unlined canal giving a seepage loss of 3.3 cumecs per million Sq. metres of wetted area is proposed to be lined with 100 mm thick cement concrete lining; which costs Rs. 4989.62 per 10 Sq. m, and discharge required to supply the water in 3 days with 2” depth for Ayacut, which cost of water from all crops Rs. 5050.50/Cumec. Given the following data work out the Annual revenue per cumec of water from all crops, economic analysis of lining and benefit cost ratio.. 

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ECONOMIC ANALYSIS OF IRRIGATION CANAL LINING

Example :-  An unlined canal giving a seepage loss of 3.3 cumecs per million Sq. metres of wetted area is proposed to be lined with  100  mm thick cement concrete lining; which costs Rs. 4989.62 per 10 Sq.  m,  and discharge required to supply the water in 3 days with 2”  depth for Ayacut, which  cost of water from all crops Rs.  5050.50/Cumec. Given  the following data work out the Annual revenue per cumec of water from all  crops, economic  analysis of lining and benefit cost  ratio.

ECONOMIC ANALYSIS OF IRRIGATION CANAL LINING. Discharge in the channel = 83.5 cumecs. Area of the channel = 40.8 sq. m. Wetted perimeter of the channel = 18.8 metres Wetted perimeter of the lining = 18.5 metres Annual maintenance cost of unlined channel per 10 sq. m	= Rs. 800 Assume additional suitable data, if required.. 

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Discharge  in the channel			          		                      =  83.5 cumecs. Area of the channel				          		                      =  40.8 sq. m. Wetted perimeter of the channel		         		                 = 18.8 metres Wetted perimeter of the lining		          	 		            = 18.5 metres Annual maintenance cost of unlined channel per 10 sq. m	= Rs. 800 Assume additional suitable data, if required.

ECONOMIC ANALYSIS OF IRRIGATION CANAL LINING. Solution :- Annual revenue per cumec of water from all crops = Rs. (83.5 x 5050.50) = Rs. 4.22 lakhs Let us consider 1 km reach of canal Therefore, the wetted surface per km = 18.8 x 1000 = 18800 Sq.m/km Annual Benefits (a) Seepage [Results of experiments on canals at various places in India indicate that loss in cubic metres per sec. for a million sq. metres of wetted perimeter ranges from 2.20 to 20.00 in unlined canals and 0.10 to 2.00 in case of lined canals ].. 

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Solution :-  Annual revenue per cumec of water from all crops = Rs. (83.5 x 5050.50) = Rs. 4.22  lakhs Let  us  consider  1 km reach of canal Therefore,  the wetted surface per km = 18.8 x 1000 = 18800  Sq.m/km Annual  Benefits  (a) Seepage  [Results of experiments on canals at various places in India indicate that loss in cubic metres per sec. for a million sq. metres of wetted perimeter ranges from 2.20 to 20.00 in unlined canals and 0.10 to 2.00 in case of lined canals ].

FINANCIAL JUSTIFICATION AND ECONOMICS OF CANAL LINING

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