SESSION-1 : MICRO-IRRIGATION (SPRINKLER/DRIP ETC.)
INTRODUCTION OF MODERN LPS DRIP SYSTEM OF IRRIGATION IN UPPER BHADRA IRRIGATION PROJECT, KARNATAKA M G SHIVAKUMAR SUPERINTENDING ENGINEER,KNNL R CHELUVARAJU CHIEF ENGINEER,KNNL M SATISH SUPERINTENDING ENGINEER,KNNL
The Project features ; –Lifting water from Tunga river to Bhadra reservoir (81 m lift) –Lifting water from Bhadra Reservoir to Ajjampura tunnel (84 m lift) –Construction of Ajjampur tunnel –Construction of canal system to irrigate an area of 214000Ha by LPS DRIP SYSTEM – Fill up tanks in the command for groundwater recharge and drinking water purposes
SALIENT FEATURES • The main Canal will be Open lined canal. The distribution below will be piped network (GRP/PVC). • Main Pipelines and Pressurized Irrigation Network will be installed and connect to the Drip Irrigation System. • The pipe network carries water to individual Head Unit(s) ( 50 Ha drip modules) spread over the command area. • The pipe network will have control valves near to the Head Unit to control the discharge rate & ON / OFF the system. • The topography of the command area is such that; -39% area requires pumping (LPS) -61% area can be served by gravity (LPS)
SYSTEM EFFICIENCY â€˘
System efficiency under flood irrigation Seepage and canal losses from Main Canal & DistributariesOperation losses Total losses With these losses, Conveyance efficiency Field channel efficiency Field efficiency -
15% 10% 25% 75% 85% 80%
Irrigation efficiency = 0.75X0.85X0.80 = 0.50 System efficiency under drip irrigation Seepage and canal losses from Main Canal Efficiency of the drip irrigation system below the main canal -
Irrigation efficiency = 0.90X0.90 = 0.81
Due to the increased efficiency ,ICA is increased to over 2,14,000 ha.
LPS DRIP IRRIGATION
ADVANTAGES OF LPS DRIP •
Land acquisition for distribution system not required.
Due to piped network connected to modern micro-irrigation system, 90% WUE is achieved at filed level.
WUE increased from 50% (OPEN CANAL) to 81% in DRIP.
Water saving, labour saving, power saving, fertilizer savings, etc.
Lesser O & M costs.
Execution time reduced.
System operates like a Pressurized Irrigation Network System (PINS) which eliminates the need of creating electrical infrastructure for irrigation across the command area like in the case of sprinkler/high pressure drip irrigation.
The centralized pumping system ensures easy operation of the system as flow of water through the network of pipes can be controlled from one place rather than from various locations.
System Area (ha)
Emitter discharge (lph)
DripNet Presuure Compensated (DNPC) 0.60
Emitter spacing (m)
Lateral spacing (m)
e = b/(c x d)
g = f/e
Actual operating hrs/day
Shift area (ha)
k = j x e x 10
Block-1 under CBC Location Latitude - 13°45'30’ Longitude - 76° 3' 44.90"E
Application rate (AR) (mm/hr) PWR (mm/day) Shift duration (Hr) No. of shifts/day
Shift flow (m3/hr) Water Source Flow rate variation (%)
DRIP MODULE 50 HA.
Daily and alternate day Irrigation â€˘
For current design (Khariff-semidry crops), Peak Crop Water Requirement is 3.2mm/day. For daily irrigation entire area can be covered in eight shifts with 2.67 Hr shift duration in 21.3 Hrs. For same area for alternate day irrigation amount of water to be discharged will be 6.4 mm and shift duration will be 5.34 Hrs.
OPERATION SCHEDULE-DAILY IRRIGATION
OPERATION SCHEDULE-ALTERNATE DAY IRRIGATION
DRIP IRRIGATION SYSTEM COMPONENTS
• Automation • Drip irrigation system models; -Operated by electrical power -Gravity -Solar power -Conjunctive use • Training & Capacity building
TECHNICAL BACKING BY UN-FAO •
KNNL has been in the forefront in India in adopting modern technology and tools for effective management of its irrigation systems with the active backing of UN-FAO. KNNL has the experience in construction and management of large irrigation system (45) having a vast command area of about a million hectares. FAO has been backing KNNL efforts in improving the performance of the large irrigation systems through the MASSCOTE (Mapping SYstem and Services for Canal Operation Techniques) approach. The six training workshops that are held since 2006 in irrigation projects in Karnataka have built the technical capability of over 250 key staff of KNNL in adopting modern methods of irrigation such as sprinkler/drip and modern tools of management. KNNL is implementing the UBP as an ‘Integrated Water Resources Management’ project given its combined objectives of meeting irrigation, drinking and urban water supply. KNNL looks at this project as a pioneering pilot project which will set a model not only for its new projects but also for other projects in the State and the Country. This project will therefore bring about the desired transformation and reforms in the management of water resources which will have National relevance.
• Large scale LPS drip system of irrigation in UBP is found to be feasible ( 2.14 lakh ha). • The project efficiency achieved is 81% as against 50% with conventional irrigation. • There would be considerable savings in water. • This is in line with the State Water Policy which promotes drip and sprinkler irrigation to improve water use efficiency. • This is in line with the National Water Mission of the Ministry of Water Resources, Govt. of India which promotes the integrated management of water resources and increase WUE by 20 %. • Capacity building: KNNL has been engaged in capacity building of its staff with support from UNFAO.
STATUS OF PROJECT
CC lining in km 20
Pump house near Shantipura (Tarikere Tq.)
Jambadahalla aqueduct in km 17