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Assessment of Water Resources for Rice Based Crop Cultivation in Satkhira Region-2001

Dr M A Sattar
CSO & Head
IWM Division, BRRI

Dr Sanjida Parveen Ritu
Senior Scientific Officer
IWM Division, BRRI

Abstract/ Executive Summary:

This study was conducted at seven Upazillas of Satkhira district for the last five years. Objective of this study was to assess the trend of irrigation devices for surface and ground water irrigation and to assess the trend of area irrigated by the irrigation devices. Result indicate that ground water salinity decreasing trend was found with the affect of rainfall in Satkhira. But in location-1 the trend of decreasing salinity level was not significant, because of excess groundwater used for boro cultivation. The incoming salinity from the tubewell periphery sometimes increases higher salinity rate even the rainfall was uniform compared to location-2. Salinity level at location-2 was higher than location-1 because there was a river with saline water beside location-2. The ranges of salinity during peak rainy season for the two locations were (0.768-0.759 dS/m to 0.52-0.1 dS/m, respectively.

Keywords: EC, Groundwater table, Soil salinity, Irrigation coverages, Irrigation devices.

Location: Satkhira

Start Date: 01-07-2000

End Date: 30-06-2001

Program Area: Crop-Soil-Water Management

Commodity: Water management

Objectives:

To assess the trend of irrigation devices for surface and ground water irrigation
To assess the trend of area irrigated by the irrigation devices

Methodology:

Secondary data were collected from DAE sources to know the number of irrigation devices (DTW, STW, LLP and other irrigation devices) and their respective irrigated areas with respect to different crops in seven Upazillas of Satkhira district for the last five years. From those secondary data number of irrigation devices used and their coverage trend for various crops were determined. Weekly ground water table depths were recorded by using avometer. Relationship between rainfall and groundwater table were established for the study location. Weekly groundwater salinity for two locations was monitored by EC meter. Groundwater of location-1 was used for boro cultivation and location-2 was unused. There was a river with saline water 2 m apart from location-2. Relationship between rainfall and groundwater salinity for those two locations was established for the study location.

Source of Information: Proceedings of BRRI Annual Internal Research Review, 2001

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Irrigation resources: Most of the number of irrigation devices was increasing trend in the study area except DTW. Number of STW was maximum during 1999-2000 followed by 2000-2001. The number of LLP increased from 1997 to 1998 then decreased during 1999 and again increased during 2000. Maximum number of LLPs was used in Shamnagar (a highly saline area) followed by Kaliganj (a moderately saline area). In other Upazillas, very limited number of LLPs were used compared to Shamnagar and Kaliganj. Manually operated irrigation devices decreasing since 1997. Irrigated area: area coverage by DTW and STW for boro irrigation was increasing, but area coverage for wheat and other crops were decreasing in the study area. Relationship between groundwater table depth and rainfall: depth of groundwater table varies with rainfall. When rain water contributes to the lower aquifer water table rises. Water table depleted maximum during last week of Feb and reached almost near the ground surface during Jun-Jul.

Knowledge Management: Report/Proceedings