Service Contract No 2007 / 147-446 NYANYALI ... - Swaziland

More documents

Recommendations

Info

EAC COMPUTATION MATRIXThese costs have been calculated only for Phase Two of theProjectITEM COST ITEM Main Bid1 Infield irrigationCapital cost (E) -Useful life (years) 10Annual maintenance (%) 3EAC of infield irrigation (E) -2 Distribution systemCapital cost (E) -Useful life (years) 20Annual maintenance (%) 2EAC of Distribution system (E) -3 Pumping plantCapital cost (E) -Useful life (years) 15Annual maintenance (%) 1EAC of Pumping plant (E) -4 FiltersCapital cost (E) -Useful life (years) 15Annual maintenance (%) 3EAC of Filters (E) -5 Annual Energy Cost (E) 111,466.06Total EAC (E) -Energy cost as a % of total EAC#DIV/0!For sprinkler irrigation a 40% EAC value is accepted. A higher and a lower figure indicatesover design and under design respectivelyNyanyali Farmers Cooperative Report - 2009 Page - 23 -
4.1.3 S u p p l y S y s t e mThe evaluation of the supply system is discussed under the following headings;4.1.3.1 Mainline sizeSABI norm suggests that for raising main lines with a diameter of 200mm or smaller amaximum of 1.5m friction fore ach 100 m pipe length (1.5%) is allowed (ARC, 2003).Mainlines with pipe sizes greater than 200mm are evaluated by determining the mosteconomical pipe diameter; capital and annual cost for different pipe diameters werecompared and the following equation is used;dkQWhere: di = inside diameter of pipe, mmK= constant derived from annual irrigation hoursQ= flow rate (m 3 /h)0.37i …..……………………….……… (8)<strong>No</strong> information was available on irrigation layout and pipe sizes and class. An undisputedconclusion, however, on whether the supply system was correctly designed or not can not bedrawn until precise details on pipe size, pipe classes, and distances occupied by the differentsizes are obtained. Accurate details are required also on the maximum area available forfuture development and a hydraulic check conducted thereafter.4.1.3.2 Mainline classFor the same reason as above, this evaluation could not identify as to whether the mainlineclasses were correctly designed or not. Pipe bursts are one major indicator of underspecificationin pipe classes and none were experienced on mainlines except for a fewidentified sections just after the pump house.Nyanyali Farmers Cooperative Report - 2009 Page - 24 -
Page 1: Restructuring and DiversificationMa
Page 5 and 6: 8 RECOMMENDATIONS .................
Page 7 and 8: ABBREVIATIONSAbbreviationAEARCASAEC
Page 9 and 10: 2 B A C K G R O U N D O N I R R I G
Page 11 and 12: 3 T E C H N I C A L A U D I T R E P
Page 13 and 14: 7,1 Type type Vyrsa 70 Vyrsa 707,2
Page 15 and 16: Soil informationSoil properties use
Page 17 and 18: 4 F I E L D E V A L U A T I O N O F
Page 19 and 20: Figure 5. 2 x 300mm x 45° bends on
Page 21 and 22: 4.1.1.1.3 Suction Pipe InletsSpacin
Page 23 and 24: hf6375kQ4d2……………………
Page 25 and 26: Table 1. pump and motor specificati
Page 27 and 28: Figure 13. Inside Nyanyali pump hou
Page 29: pipe:Filters:Pumpingequipmentand el
Page 33 and 34: When down -stream pressure falls be
Page 35 and 36: 5.1.1 S p r i n k l e r p r e s s u
Page 37 and 38: 6 A S S E S S M E N T O F O P E R A
Page 39 and 40: indication of the amount small grow
Page 41 and 42: 7 C O N S T R A I N T S T O E F F I
Page 43 and 44: ‣ The optimum sprinkler operating
Page 45 and 46: 8 R E C O M M E N D A T I O N STo e
Page 47 and 48: ‣ A consortium could be formed fo
Page 49 and 50: Accurate details are required also
Page 51 and 52: 12. Solomon K.H. 1988a, Irrigation
Page 53 and 54: Nyanyali Farmers Cooperative Report
Page 57 and 58: SEB usage for River pump station Ph

Service Contract No 2007 / 147-446 NYANYALI ... - Swaziland

Create successful ePaper yourself

Delete template?

Save as template?