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Agro-hydrologic and Economic Analysis of On-farm Reservoirs for Drought Alleviation in Rainfed Rice Lands of North-west Bangladesh:rainfall-runoff-storage Model-1995

Dr. M Towfiqul Islam
SSO
Irrigation and water Management Division, BRRI, Gazipur-1701, Bangladesh

Dr. Md. Nazmul Hassan
SSO
Irrigation and water Management Division, BRRI, Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

The study was conducted to determine the agro-hydrologic parameters that influences the performance of OFRs, to develop a model for predicting OFR storage from rainfall and runoff during the two wet seasons of 1994-95. The catchment area and the service area (irrigated area) of each of the OFRs were delineated through field inspection. A stuff gage was installed in each of the selected OFRs in order to measure the change in water level. For the survey, pre-designed questionnaire was used . About 31 years of rainfall data (1963-93) of Godagari were collected. A rainfall probability analysis was carried out in order to predict the OFR storage that can be made available for supplemental irrigation. It has been mentioned earlier that a OFR can be expected to be about 55% and 85% full if the rainfall prior to 15 July are 400 and 700 mm respectively. Expected cumulative rainfall at different months showed that probabilities of 400 and 700 mm of rainfall before 15 July are 50% and 20% respectively. The probability of getting 400 mm of rainfall by 15 August was 80%. Thus, in an average year when the OFR was 55% full by 15 July, it was expected to be completely full by the beginning of September and adequate water should be available for supplemental irrigation in October. But, in two out of ten years (80% probability) when the reservoir was 55% full by 15 August, it can be expected. With this storage the farmers should able to provide at least two supplemental irrigation during October.

Keywords: On-farm reservoir, Drought alleviation, Rainfed rice

Location: Godagary, Rajshahi

Start Date: 01-01-1994

End Date: 31-12-1995

Program Area: Crop-Soil-Water Management

Commodity: Rain water

Objectives:

To determine the agro-hydrologic parameters that influences the performance of OFRs
To develop a model for predicting OFR storage from rainfall and runoff

Methodology:

The study was conducted during the two wet seasons of 1994-95. The physical parameters (area, volume, depth and side slope) of 10 randomly selected OFRs, owned and operated by the farmers in the study area were measured. The catchment area and the service area (irrigated area) of each of the OFRs were delineated through field inspection. A stuff gage was installed in each of the selected OFRs in order to measure the change in water level. Crop production practices of 20 randomly selected farmers; 10 with access to the selected 10 OFRs and the rest without access to any irrigation but within the vicinity of the selected OFRs, were monitored and surveyed during each of the two years in order to characterize their land use and productivity. For the survey, pre-designed questionnaire was used and apart from crop production practices information on OFR water use, construction, operation and maintenance costs, irrigation cost and crop yield were collected. 31 years of rainfall data (1963-93) of Godagari were collected. The following water balance equation was used:

V_t=V_t-1+R_t+RO_t-EV_t-S&P_t-IR_t

Source of Information: Proceedings of the BRRI Annual Internal Review for 1995, BRRI, Gazipur-1701, Bangladesh

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It has been mentioned earlier that a OFR can be expected to be about 55% and 85% full if the rainfall prior to 15 July are 400 and 700 mm respectively. Expected cumulative rainfall at different months showed that probabilities of 400 and 700 mm of rainfall before 15 July are 50% and 20% respectively. The probability of getting 400 mm of rainfall by 15 August was 80%.

Knowledge Management: Report/Proceedings