Adoption of modified pandey bioeconomic model for evaluating the economic feasibility of rain water harvesting (RWH) for supplementary irrigation in semi-arid areas of Tanzania
| dc.contributor.author | Mashinga, Theobald Nyatanyi | |
| dc.date.accessioned | 2026-04-29T08:52:33Z | |
| dc.date.available | 2026-04-29T08:52:33Z | |
| dc.date.issued | 1996 | |
| dc.description | Dissertation | |
| dc.description.abstract | A weather driven simulation model was developed to evaluate the economic feasibility of rain water harvesting (RWH) in the farming system. The biophysical parameters were incorporated with the economic parameters to determine the net benefits of RWH system to a farmer. The model is composed of the biophysical component which consists of the following submodels, rainfall-runoff , soil water balance, evapotranspiration ,and the economic submodel which consists of the input-output prices relationship component. When the two components were incorporated, they facilitated decision making regarding the prospects of RWH technology of reference. The model was calibrated using historical climatic data obtained from meteorological stations at experimental site.The data collected were for three seasons (1991/92-1994/95). The model validation was performed by correlating observed and predicted data. The observed data were obtained from the field trials and historical data, while the predicted data were estimated using the simulation model. A regression analysis was applied to test the performance of the model. A 1:1 graph was produced in which a straight line passing through the origin was fitted to the data. A perfect prediction would lead all points lying along 45° line passing through the origin to a correlation coefficient of 1. The slope of the regression line was taken as a correlation factor for calibrating the predicted data. The model revealed that, the returns accrued to the resources invested could be recovered, particularly in years proceeding the initial year of investment. This is because the storage tank is a long term asset which generates a stream of benefits for several years in future. This can be reflected by the high yield harvested under RWH storage, comparing with the yield produced without RWH storage. Whereas the yields produced under catchment area ratio (CA:CF) of 4:1 and 2:1 with RWH storage were 3.92 and 2.53 t/ha respectively, the yields produced under catchment area ratio (CA:CF) of 4:1 and 2:1 without RWH storage were 1.92 and 2.4 t/ha respectively. Basing on the findings of one growing season data, it is shown that RWH system could be a break through to the long term problem of erratic and unreliable rainfall in semi-arid areas of Tanzania. In view of this, it is recommended that RWH techniques be advocated for adopting by a smallholder farmers in Tanzania. | |
| dc.description.sponsorship | SACCAR/GTZ | |
| dc.identifier.uri | https://www.suaire.sua.ac.tz/handle/20.500.14820/7514 | |
| dc.language.iso | en | |
| dc.publisher | Sokoine University of Agriculture | |
| dc.subject | Modified pandey bioeconomic model | |
| dc.subject | Economic feasibility | |
| dc.subject | Rain water harvesting (RWH) | |
| dc.subject | Irrigation | |
| dc.subject | Semi-arid areas | |
| dc.subject | Tanzania | |
| dc.title | Adoption of modified pandey bioeconomic model for evaluating the economic feasibility of rain water harvesting (RWH) for supplementary irrigation in semi-arid areas of Tanzania | |
| dc.type | Thesis |