This research was conducted on the assessment of the use of hillside rainwater harvesting ponds on Agricultural Production in Unicoopagi cooperative union located in Nyamigina cell, Tare sector of Nyamagabe District. The research involved both primary and secondary data. The primary data was collected using questionnaire, interview and observation while secondary data was derived from existing document dealing with rainwater harvesting pond at national and worldwide. The results from collected data showed that the level of adoption of rain water harvesting ponds was used by 51.5% farmers; the main reason of failing level of RWH ponds is due to small plot size of farmers; and the main factors contributing to the use of this technology include land acquisition and irrigation. It is further revealed that the use of rain water harvesting pond impacted positively; the agriculture production on 0.5 hectares per 4 years, has generated the income of 17,772,800 Rwandan Francs for non-irrigated plot, while the same plot irrigated with the use of rain water harvested the income increased up to 20,296,450 Rwandan Francs. Beside this rain water harvesting ponds has some observed negative effect among water users that include social conflicts, accident and breeding of mosquitoes with percentage equivalent to 41%, 27% and 32% respectively. The analysis of variance (ANOVA) results show that the amount of agriculture production and generated income was significantly different between adopted and non-adopted rain water harvesting techniques. The implication of these findings is that the adoption of rainwater harvesting ponds presents a way forward for reducing rural poverty. With the increase of rainfall variability and evaporation due to climate change, rain water harvesting will become a key intervention in adaptation and in reducing vulnerabilities of crop water stress. Therefore, extent knowledge in RWH techniques needs to be considered as an important, manageable resource in water management policies, strategies and plans. Considering that farmer’s perception in increasing crop yield is due to rain water harvesting, this will encourage the adoption of this techniques. Thus for the RWH techniques to be effective and bring higher return to farmers, it should goes hand in hand with other improved agriculture Techniques and Agro-inputs uses such as Land consolidation, improved seeds, pesticide and fertilizers.