We are trying to channel rainfall from the inter row to the seeded row in dryland farming systems in Western Australia. In order to do this we have created inter-row hills to run water into the seeded furrow. The efficiency of collecting water is low and we are wondering if you can treat the hills inexpensively to get more efficient runoff into the furrows? We are currently trying polymers to improve runoff but with mixed success. Details of this work are given in Barrett-Lennard et al. 2021 (micro water harvesting........)