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in TheSlakouRiverBasin, Kingdom ofCambodia The StudyonRehabilitation andReconstruction N Japan International CooperationAgency of AgriculturalProductionSystem O6 O5 51ha O1 167ha273ha /222ha Canal 24 0 500 1000 1500 2000 2500 SCALE O2 161ha O3 C4 C7 Kpob Trobek Res. Village List O7 Canal 23 O3 CT1 O Saray Commune 376ha C1 528ha866ha / 704 ha O1 Trapeang Dang Tuek O2 Stueng C8 338ha Canal 22 O3 Trapeang Krasang Canal 22 O4 Trapeng Kralanh C1 O4 Canal 33 C2 O5 Boeng Satong CT2 O6 Trapeang Khchau C5 O7 Tnaot Chum Canal 21 Canal 21 Trapeang Thum Khan Cheung Commune C6 C1 Peak Bang'aong C3 C2 Trapeang Svay C3 Angk Trav F -26 C7 CT3 Canal 20(new) C4 Pou Doh Irrigation System Irrigation AreaoftheUpper SlakouRiver Figure II-4.2.2 Canal 20 C5 Prey Dak Por T1 C9 C6 Prey Khvav K oh Angk Roka C7 Prey Sbat C8 Ta Soun K T12 aek C9 Prey Ta Lei T5 Cheang Tong Commune T2 CT1 Trapeang Tuk CT2 Ta Tim Canal 18 (new) CT3 Srae Kruo Trapeang Thum Khan Tboung Commune T8 Ta Phem T1 Prey Preal T6 1105ha1811ha / 1474ha T2 Trapeang Saom T3 T3 Trapeang Chhuk T9 T11 T4 Trapeang Prey T5 Prey Rumduol T7 T6 Trapeang Tnaot Canal 17 T7 Trapeang Kaoh T4 T10 T8 Kou Chen Leaeng S1 T9 Trapeang Khan S5 S2 T10 Prey Kdei T11 Som Rong T12 Prakeab Stage-1 Stage-2 Total S3 Canal 16 S4 Canal 24 74ha 251ha 325ha Samraong Commune S1 Ta Pen Canal 33 234ha 791ha 1025ha S6 Koh Kaek 492ha 1658ha 2150ha S2 Trapeang Thmar S3 Krabei Prey S7 S4 Sambuor S8 Canal 15 S5 Trapeang Chaeng S6 Chan Teab S7 Koah Nhae S8 Prey Ta Dok _ r}8 w.190 w6,}0+,/ l}7,+8. lkyonzq w.43- l4,93- r~}1642,}7 ch ci z491 r.*.,}; z92395 s40 ca w6,; r+49*. u468. cc z6}5,}3- r6}3.93- l49,3- y} z43- vy}6}; i cd k3- x42 s,*. y:}; w6,; r+49*. y498. cb vy}6}; k3- w6,; y~}8 w6,; n40 w46 b y}3 n46 d g r54~z64~,0 h bi s92*.}3- bj w45,,1 v8+}2 y496/;} z6}5,}3- z.92 c r.}3- m.,93- z6}5,}3- y:}; bh m.,}3- z43- k3- w6,; w6,}1 ce dd z6}5,}3- z.92 z} w.,2 r.}3- z~493- zxkt rkr k3- bga cg k3- z} w.,2 bb bc cc k3- {}8 m.}25} k3- w6,; r+,/ cf s,}; l496 y}26}43- zkrov k3-0 z} y}42 c y+40 y}5 j d k3- r.3}6 k3- r*.,}; e z} t493- da r97 z92395 z} v92 c y6}, x43493- be z6}5,}3- s,}3 z92395 z} y,7 cj ba u.},3- u.}3- k3- y6}, x43493- k3- r41 r462 bd f db bga x,7,6:4/6 z92395 r/2 y,/ k3- vw6,; x42+491 bf x43,}2 zxokup d z6}2 r}0 r.:}: k3- |,}; m.643- bg k3-0 r},: ?=>=@< acdbef02 ymkso w64:/3*/}1 m}5/8}1 u}8/3}1 x4}+ d n/786/*8 m,38,6 t}/3 x4}+ m42293, m,38,6 y89+; k6,} x,7,6:4/6 b y}3 n46 The Study on The Rehabilitation and Reconstruction of Fig. II-4.3.1 of Agricultural Production System in The Slakou River Basin, The Kingdom of Cambodia Existing Small Reservoirs Japan International Cooperation Agency ]VY\ Technical Evaluation on Proposed Rehabilitation and Reconstruction Water source 5 No=0, some=3, stream or river=5 Construction volume 3 Large=0, Fair=3, Little=5 Technical soundness 5 Low=0, Fair=3, High=5 Evaluation Increase of irrigation area 5 Less than 15 ha=0, 15~30ha=3, over 30 ha=5 Possibility of participation 5 Doubtful=0, Possible=3, High=5 Total Score 23 A: 21~25, B:16~20, C:11~15, D:6~10, E:0~5 Total Evaluation A Comment: Advantage of this scheme is the natural stream flowing to the reservoir. Even in the driest month, some water is flowing, and reservoir efficiency is considered higher. Also, a village-based water users group has been organized to request rehabilitation of the reservoir. Participation of water users’ group is expected. Natural inflow (stream) SECTION A - A Spillway(gate) flushed away 2m 2.6m 360m Reservoir Pipe Outlet (D=0.2m,L=10m x2) A Dike flusfed away around the pipe outlet Photo-2 Photo-1 Irrigation Area 30ha Dike flushed away 400m Photo-1 Photo-2 Dike was flushed away for 10 m long Reservoir (dead water) The Study on the Rehabilitation and Reconstruction Fig. II-4.3.2 of Agricultural Production System in the Slakou River Basin, The Kingdom of Cambodia Results of Evaluation of Ang 160 Reservoir, Japan International Cooperation Agency Trapeang Thum Khang Tboung Commune F -28 Technical Evaluation on Proposed Rehabilitation and Reconstruction Water source 5 No=0, some=3, stream or river=5 Construction volume 3 Large=0, Fair=3, Little=5 Technical soundness 5 Low=0, Fair=3, High=5 Evaluation Increase of irrigation area 5 Less than 10 ha=0, 10~20ha=3, over 20 ha=5 Possibility of participation 5 Doubtful=0, Possible=3, High=5 Total Score 23 A: 21~25, B:16~20, C:11~15, D:6~10, E:0~5 Total Evaluation A Comment: Water source itself seems to be sufficient even without water flow from the Slakou River, because the Canal No.8 drains much water on the upstream. According to the village chief, the reservoir was operated well before 1999. However, The dike would be reconstructed for 10m long. a re A Check gate on Canal No.8 n 0 m tio a 46 Stop logs are fully closed a h Photo-1 3 rig 0 5 Ir 2 0 Canal No.8 m O flow utle ) t Pip m O .5 utlet 0 e (D = D Pipe ( =0.2 e S ip p (D=0.2m m) P il t lw le a n O y I Photo-2 utlet P ) O u ip Reservoir tlet Pip e (D=0.2m) e (D=0.2m) Ang Ta Saom National Road No.3 Tram Kak Dike is damaged CommuneOffice Cross Drains Photo-1 Photo-2 Reservoir (dead water) Dike was flushed by the stored water The Study on the Rehabilitation and Reconstruction Fig. II-4.3.3 of Agricultural Production System in the Slakou River Basin, The Kingdom of Cambodia Results of Evaluation of Tumnup Kim Sei Japan International Cooperation Agency Reservoir, Nhaeng Nhang Commune F -29 64m 18m 28m 18m Irrigation Area: 0.34ha Loss Irrigation Effective Other Volume 846 m3 4.5m 15m 4.5m 2m 24m 2m Irrigable Area Required Catchment for the Pond Crop-1 (August to October) Crop-1 (August to October) Net Water Requirement = 400 mm (90 days) Monthly 80% dependable specific runoff in July Effective Rainfall=240mm (Takeo Town, August - = 42 m3/ha/month October) Initial Storage Requirement (by end of July)= 30 % Irrigation Efficiency=0.80 = 253.8 m3 Gross Water Requirement for Irrigation= 200 mm Required Catchment = 253.8 € 42 =6.0 ha Other Water Requirement = 50 mm = 6.0 ha (about104 times of the pond area) Evaporation Loss=5mm/day x 90 days = 450mm Percplation Loss=2mm/day x 90 days = 180mm Effective Depth = 2.37m (3.00 - 0.45 - 0.18) Side slope of pond = 1:1.5 Effective Volume: (15m x15m +22.11m x 22.11m) €2 x (3m-0.45m- 0.18m)=846m3 846m3 x200/250)€200mm=3,384m2=0.34 ha Crop-2 (November to January) Crop-2 (November to January) Net Water Requirement = 400 mm (90 days) Monthly 80% dependable specific runoff in October Effective Rainfall=0 mm (Negligibly small) = 327 m3/ha/month Irrigation Efficiency=0.80 Storage Requirement (by end of October)= 100% = Gross Water Requirement for Irrigation= 500 mm 846 m3 Other Water Requirement = 50 mm Required Catchment = 846 € 327=2.6 ha Effective Volume: 846m3 = 2.6 ha (about 45 times of the pond area) 846m3 x (500/550)€500mm=1,538m2=0.15ha The Study on The Rehabilitation and reconstruction of Agricultural Production System in the Slakou River Fig.II-4.4.1 Basin The Kingdom of Cambodia Model Pond Plan Operated by Farmers Group Japan International Cooperation Agency F - 30 32.5m 7.5m 17.5m 7.5m Irrigation Area = 0.07 ha Loss Irrigation Effective Other Volume 184m3 4.5 4.5 4.5 2.0 m 2.0 m 13.5m m m m Irrigable Area Required Catchment for the Pond Crop-1 (August to October) Crop-1 (August to October) Net Water Requirement = 400 mm (90 days) Monthly 80% dependable specific runoff in July Effective Rainfall=240 mm (Takeo Town, August to = 42 m3/ha/month October) Initial Storage Requirement (by end of July)= 30 % Irrigation Efficiency=0.80 = 55.2 m3 Gross Water Requirement for Irrigation= 200 mm Required Catchment = 55.2 € 42=1.314 ha Other Water Requirement = 50 mm = 1.3 ha (about 72 times of the pond area) Evaporation Loss=5mm/day x 90 days = 450mm Percplation Loss=2mm/day x 90 days = 180mm Effective Depth = 2.37m (3.00 - 0.45 - 0.18) Side slope of pond = 1:1.5 Effective Volume: (4.5m x4.5m +11.61m x 11.61m) €2 x (3m- 0.45m-0.18m)=184m3 184m3 x(200/250)€200mm=1,287m2=0.07ha Crop-2 (November to January) Crop-2 (November to January) Net Water Requirement = 400 mm (90 days) Monthly 80% dependable specific runoff in October Effective Rainfall=0 mm (Negligibly small) = 327m3/ha/month Irrigation Efficiency=0.80 Storage Requirement (by end of September)= 100% Gross Water Requirement for Irrigation= 500 mm = 184 m3 Other Water Requirement = 50 mm Required Catchment = 184 € 327 =0.563 ha Effective Volume: 184m3 = 0.6 ha (about 33 times of the pond area) 184m3 x (500/550)€500mm=335m2=0.03ha The Study on The Rehabilitation and reconstruction of Agricultural Production System in the Slakou River Fig.