Service Contract No 2007 / 147-446 - Swaziland

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3.1.2 R e v i e w o f C o n t a c t o r ’s I r r i g a t i o n D e s i g n C r i t e r i aa n d S p e c i f i c a t i o n s3.1.2.1 PlanningOf the four major input of planning namely crop, climate, soil and irrigation system; the studyrevealed that crop and climate information used as supplied by the SSA (Swaziland SugarAssociation). Design documentation could not be obtained but site investigations revealedthat the irrigation system developed only of good soils (mostly type I soils, only block I is ontype III soils). Based on this, soils were taken into account in the design.Attached in appendices is a soil map of Maphobeni Farmers Association indicating major soiltypes the project was developed on. Information on whether soils were taken into accountduring design could not be found.The purpose of this study was, therefore, to determine the quantity of water required by thecrops per cycle during peak demand periods and how often it was to be applied takingpractical operating practice into account.Taking soils into account the following planning schedule was developed;Peak Design-Norm For Sprinkler Irrigation At Maphobeni Farmers Ass.1 GENERAL INFORMATION1,1 Owner Maphobeni Farmers Association1,2 Farm Name - Number - Co-ordinates Swazi nation land1,3 Telephone number1,4 Area developed 151 Ha1,5 Water Allocation 100 l/s2 CLIMATE2,1 Month state Jan2,2 Weather station state Mhlume2,3 Evaporation mm/day 7mm A-Pan or 5mm Grass Factor3 MANAGEMENT3,1 Available working days per week days 73,2 Available working Hours per day hours 24Maphobeni Farmers Association Report - 2009 Page - 5 -
4 CROP BLOCK NO Lesibovu/Short./Oakleaf Somerling/Glenrosa4,1 Type state Sugar Sugar4,2 Area Ha 20 94,3 Plant spacing m NA NA4,4 Row spacing m 1.8 1.84,5 Effective root depth m 0.45 0.454,6 Plant time date August August5 SOIL Lesibovu/Short./Oakleaf Somerling/Glenrosa5,1 Effective soil depth m 1 15,2 Water holding capacity mm/m 180 1405,3 Easy available water (10-50 kPa) 50% mm/m 90 405,4 Easy available water in root zone mm 40.5 186 WATER6,1 C en S Classification of water C+S Komati River7 EMITTER7,1 Type type Vyrsa 70 Vyrsa 707,2 Nozzle size mm 11/64 11/647,3 Discharge l/h 1390 13907,4 Working pressure kPa 350 3507,5 Application efficiency % 70 707,6 Emitter spacing m 18 187,7 Lateral spacing m 18 187,8 Wetted diameter m 36 367,9 Gross Application rate on wetted area mm/h 4.29 4.297,10 Nett Application rate on wetted area mm/h 3.33 3.338 SCHEDULING8,1 Crop factor (max) max 1.15 1.158,2 Evaporation mm/day 5 58,3 Evapotranspiration mm/day 5.75 5.758,4 Net Irrigation requirement mm/day 5.75 5.758,5 Gross Irrigation requirements mm/day 6.04 6.048,6 Theoretical cycle length day 7.04 3.138,7 Theoretical Stand time hour 12.16 5.408,8 Practical Cycle length day 6 38,9 Practical Stand time hours 12 68,10 Working days per week days 7 78,11 Irrigation hours per day hours 24 248,12Gross application rate per practicalcycle mm 51.48 25.748,13 Gross application per month mm 220.62 257.40Maphobeni Farmers Association Report - 2009 Page - 6 -
Page 1 and 2: Restructuring and DiversificationMa
Page 3 and 4: DISCLAIMERThe contents of this repo
Page 5 and 6: 5.2 Delivery tests ................
Page 8 and 9: LIST OF APPENDICESAppendix 1: SEB u
Page 10 and 11: 1 I N T R O D U C T I O NAssociatio
Page 12 and 13: pumps. 2 x Howden 100-400 in the ri
Page 16 and 17: 9 SCHEDULE OF BLOCKS THAT IRRIGATE
Page 18 and 19: Maphobeni Farmers Association Repor
Page 24 and 25: Based on equation 1 above the flow
Page 26 and 27: ReducersThe inlet on the pump sucti
Page 28 and 29: d1.5d0.5dd3d 3d 1.5dFigure 9. Spaci
Page 30 and 31: hf6375kQ4d2……………………
Page 32 and 33: Table 1. Pump and motor specificati
Page 34 and 35: Table 2. Irrigation pumps evaluatio
Page 36 and 37: Phase two river pump station‣ Pum
Page 38 and 39: Filters: 3%Capital Recovery Rate (C
Page 40 and 41: 4.3.1 M a i n l i n e s i z eThe So
Page 42 and 43: 5 F I E L D E V A L U A T I O N O F
Page 44 and 45: 5.1.2 S p r i n k l e r p r e s s u
Page 46 and 47: 0 L/4 L/2 3L/4 LL3L/4LL/2Test block
Page 48 and 49: Phase two booster Pumps running und
Page 50 and 51: The installation of this unit (on t
Page 52 and 53: Old AgePhase one of the irrigation
Page 54 and 55: The effects of different nozzles/em
Page 56 and 57: Interest RatesIt can be argued that
Page 58 and 59: 6 . 2 M a n a g e m e n t P r a c t
Page 60 and 61: 6 . 3 M a i n t e n a n c e S u r v
Page 62 and 63: 7 C O N S T R A I N T S T O E F F I
Page 64 and 65:
phase one and two was found to be 1
Page 66 and 67:
8 R E C O M M E N D A T I O N STo e
Page 68 and 69:
OVERALL MANAGEMENT AND MAINTENANCEM
Page 70 and 71:
10 L I T E R A T U R E R E F E R E
Page 72 and 73:
11 P R O D U C T I N F O R M A T I
Page 74 and 75:
Maphobeni Farmers Association Repor
Page 76 and 77:
Page 78 and 79:
Page 80 and 81:
Page 82 and 83:
Page 84 and 85:
Page 86 and 87:
SEB usage for River pump station Ph
Page 88:
Appendix 2: capital recovery factor
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Service Contract No 2007 / 147-446 - Swaziland

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