Revisiting dominant practices in floodwater harvesting systems: making flood events worth their occurrence in flood-prone areas

Abstract

The lower Shire valley region in Malawi has long been characterized by floods which have accounted for many fatalities and disaster-related economic losses in the region. Rain-fed crop production has also been adversely affected by such floods, subsequently leading to the region registering the highest levels of poverty in the country due to low agricultural crop production. This study employed both qualitative and quantitative methods and based on what is practiced in the region and elsewhere, recommended strategies that would lower the risk of engaging in crop production under floodwater harvesting. Study results revealed that farmers in the region have sought to dig networks of water ponds and shallow wells as coping strategies to future water scarcity at a scheme level. The absence of well-designed networks of field waterways in the irrigation schemes results in an unequal distribution of floodwaters among field plots. The study concluded that in addition to digging a network of shallow wells and small water ponds to enhance infiltration of floodwaters and increasing groundwater recharge, a resilient and low-risk package of the floodwater harvesting system in the region must also include (1) construction of floodwater diversion structures to increase the chances of flooding even from relatively small rainfall storms, (2) construction of floodwater field distribution channel networks to facilitate field to field distribution of floodwaters, and (3) formulating water distribution rules to enhance equal floodwater distribution among field plots.