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Integrated Crop, Nutrient and Water Management in North-west Region of Bangladesh:comparative Study in Different Water Distribution System at Stw Irrigation-2002

A M A Sattar
CSO and Head
IWMD,BBRI,Gazipur

M Moniruzzaman
PSO
IWMD, BBRI,Gazipur

Dr Golam Wahed Sarker
PSO
Agril Economics Division, BRRI

Abstract/ Executive Summary:

This study was undertaken at GKF site, Kurigram and RDRS site, Pirganj, Thakurgaon under ICM, PETRRA sub-project to compare the conveyance water saved; to reduce the irrigation time; to increase the command area; and to find out the cost-effectiveness of different water distribution systems. The study reveals that at GKF site, conveyance losses varied from 4.16 to 6.17 l/s/100 m for earthen canal, which was 25 to 54% of the actual STW discharge; for improved earthen canal it varied from 2.60 to 3.90 l/s/100 m, which was 16 to 30% of the STW discharge and for hosepipe it varied from 0.25 to 0.35 l/s/100 m, which was 2 to 3% of the STW discharge. Similarly, at RDRS site, conveyance losses varied from 5.25 to 6.44 l/s/100 m for earthen canal, which was 40 to 47% of the actual STW discharge; for improved earthen canal it varied from 3.67 to 3.97 l/s/100 m, which was 28 to 31% of the STW discharge and for hosepipe it varied from 0.26 to 0.30 l/s/100 m, which was 2% of the STW discharge. At GKF site, conveyance water saved by improved earthen canal and hosepipe over the earthen canal was 34 to 53% and 93 to 95%, respectively and at RDRS site, it varied from 29 to 38% and 94 to 96% for improved earthen canal and hosepipe, respectively. At GKF site, average conveyance time was 14.2, 6.0 and 3.2 min/100 m for earthen canal, improved earthen canal and hosepipe, respectively. The average conveyance time saved by improved earthen canal and hosepipe over the earthen canal was 58 and 77%, respectively. Similarly, for RDRS site, average conveyance time was 16.3, 8.4 and 3.1 min/100 m for earthen canal, improved earthen canal and hosepipe, respectively. For GKF site, considering 100 m distance time for irrigation coverage varied from 9.87 to 18.16 hr/ha for earthen canal, for improved earthen canal that varied from 6.58 to 13.71 hr/ha and for hosepipe that was 4.74 to 8.77 hr/ha. On an average irrigation coverage time saved by 31 and 52% for improved earthen canal and hosepipe, respectively over the earthen canal. Similarly, for RDRS site, considering 100 m distance time for irrigation coverage varied from 19.23 to 22.73 hr/ha for earthen canal, for improved earthen canal that varied from 14.49 to 16.13 hr/ha and for hosepipe that was 8.46 to 8.92 hr/ha. Actual command area and actual operating hours of the selected STWs were very low. Consulting the STW owners and farmers of the selected areas, there were two daily potential operating hours were considered. For GKF site, it was 8 and 10 hrs/day and for RDRS site that was 6 and 8 hrs/day. At GKF site, average command area increased by 44 and 80% for 8 and 10 hrs/day, respectively. Similarly, at RDRS site, it was 40 and 86% for 6 and 8 hrs/day, respectively.Considering only the construction and purchasing costs of different water distribution systems, the average costs were 18.6, 64.4 and 21.7 Tk./m/year for earthen canal, improved earthen canal and hosepipe, respectively for GKF site. Similarly, for RDRS site, it was 24.3, 50.8 and 21.0 Tk./m/year for earthen canal, improved earthen canal and hosepipe.

Keywords: Integrated crop management, Nutrient and Water Management, Water distribution system, STW

Location: GKF site, Kurigram and RDRS site, Pirganj, Thakurgaon

Start Date: 01-07-2001

End Date: 30-06-2002

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

To compare the conveyance water saved;
To reduce the irrigation time;
To increase the command area; and
To find out the cost-effectiveness of different water distribution systems.

Methodology:

This study was undertaken in Rabi and Boro season, 2001 – 2002 at GKF site, Kurigram and RDRS site, Pirganj, Thakurgaon under ICM, PETRRA sub-project. At each site 3 shallow tubewells (STW) were selected for this study. At least 30 m (100 ft) improved earthen canal were prepared at each STW site by clay soil coating and compaction. To fulfill the specific objectives, the following treatments were used: Earthen canal, Improved earthen canal and Hosepipe (4” – 5” diameter). Actual discharges of the STWs were measured in 15 days interval of the whole irrigation seasons by volumetric method. Conveyance losses in the earthen canal, improved earthen canal and hosepipe were measured by inflow-outflow method. In this method for hosepipe volumetric measurement was used and for earthen canal and improved earthen canal, two standard V-Notches were used. Every measurement was replicated three times for average reading. Conveyance time and field level irrigation coverage was measured for each treatment. Actual command area of each STW was measured in the field level. Actual operating hours and discharge were recorded for each STW.

Source of Information: BRRI Annual review 2002

Article Link (Online Journal):

Funding Source:

1. World Bank	Budget:
2.	Budget:
3.	Budget:

Total Budget (Tk.) :

Achievement/Findings:

At GKF site, conveyance losses varied from 4.16 to 6.17 l/s/100 m for earthen canal, which was 25 to 54% of the actual STW discharge; for improved earthen canal it varied from 2.60 to 3.90 l/s/100 m, which was 16 to 30% of the STW discharge and for hosepipe it varied from 0.25 to 0.35 l/s/100 m, which was 2 to 3% of the STW discharge. Similarly, at RDRS site, conveyance losses varied from 5.25 to 6.44 l/s/100 m for earthen canal, which was 40 to 47% of the actual STW discharge; for improved earthen canal it varied from 3.67 to 3.97 l/s/100 m, which was 28 to 31% of the STW discharge and for hosepipe it varied from 0.26 to 0.30 l/s/100 m, which was 2% of the STW discharge.At GKF site, conveyance water saved by improved earthen canal and hosepipe over the earthen canal was 34 to 53% and 93 to 95%, respectively and at RDRS site, it varied from 29 to 38% and 94 to 96% for improved earthen canal and hosepipe, respectively. At GKF site, average conveyance time was 14.2, 6.0 and 3.2 min/100 m for earthen canal, improved earthen canal and hosepipe, respectively. The average conveyance time saved by improved earthen canal and hosepipe over the earthen canal was 58 and 77%, respectively. Similarly, for RDRS site, average conveyance time was 16.3, 8.4 and 3.1 min/100 m for earthen canal, improved earthen canal and hosepipe, respectively.

Actual command area and actual operating hours of the selected STWs were very low. Consulting the STW owners and farmers of the selected areas, there were two daily potential operating hours were considered. For GKF site, it was 8 and 10 hrs/day and for RDRS site that was 6 and 8 hrs/day. At GKF site, average command area increased by 44 and 80% for 8 and 10 hrs/day, respectively. Similarly, at RDRS site, it was 40 and 86% for 6 and 8 hrs/day, respectively. Considering only the construction and purchasing costs of different water distribution systems, the average costs were 18.6, 64.4 and 21.7 Tk./m/year for earthen canal, improved earthen canal and hosepipe, respectively for GKF site. Similarly, for RDRS site, it was 24.3, 50.8 and 21.0 Tk./m/year for earthen canal, improved earthen canal and hosepipe, respectively.

Knowledge Management: Report/Proceedings