Harmony comes from the Greek word “harmonia” which means that it is harmoniously bound. In the field of philosophy, harmony is the cooperation between various factors in such a way these factors can produce an organized unity (Wikipedia).
So, how is the harmoniousness created in an ecosystem related to the coast and watershed?
Simply based on the picture above, harmoniousness will be created if the interaction between irrigate of necessity in the paddy field area and the availability of it in the watershed goes accordingly. Upstream basin, storing water that is stored in the ground from rain then flows it to the middle part of the basin for agricultural activities and the downstream basin for fishing activities. Rice planted in paddy fields in the middle watershed, has a limit of water needs that have to fulfilled in order to be able to grow-flowering-filled to be suitable for harvesting until it is processed into the main food for humans.
Harmoniousness is absolutely needed in a simple description of water needs and availability. More profoundly, concordance is needed in each aspect which is an indicator as well as a factor in water demand and availability itself. In management activities to achieve harmoniousness, it cannot be done alone by two hands and one brain. Management (coastal and watershed management) is multi-disciplinary, multi-party, multi-sector and multi-approach to create a cohesion. The management can be harmoniousness if everything in the ecosystem is fulfilled. If it is sustainable but the people in it are starving, it is not based on ecosystem management. The most important aspect to consider is social conflict in relation to the economy (Suprayogi, 2019).