Conservation Design and Scenario for Flood Mitigation on Arui Watershed, Indonesia

Abstract

Flooding has been natural disaster in Indonesia and elsewhere. This research is designed to create scenarios and designs conservation to mitigate flooding disaster. Data potential ,vulnerability, and duplicated river covering 0.25% of the targeted flooding area were collected and analysed. Five disain of conservation, natural river as control, river normalization, normalization with gabion stone, river straigtening, and straigtening with gabion stone, are proposed, and main targeted responses of these five scenarios are river current velocity. Effectiveness scenarios were analysed using Anova and Tukey test. The results showed that alignment with gabion stone was the most effective scenario for flooding mitigation since this was the most effective in increasing river current velocity. This could prevent riverbank occurrence of avalanche, accelerate river current, overcome flooding, and prevent future flooding. Other scenarios likes dead clicth ended-hallway, canalization, and riparian reclamation are also possible implemented.

Erosion Hazard Level And Design Of Soil Conservation For Flood Mitigation In The Arui Watershed, Indonesia

“…Efforts to mitigate flooding often involve increasing the amount of water that infiltrates the ground, storing excess water, and reducing surface runoff. According to Mahmud et al (2019) dams serve as reservoirs to store water during periods of excessive surface water, and this stored water can be channeled to agricultural land when needed. These strategies are critical in effectively managing and mitigating the impacts of flooding.…”

Kebuntuan Deadlock in maintaining Wosi Rendani protected forest in Manokwari Regency, West Papua

“…Seharusnya pantai tidak diuruk dan ditimbun, akan tetapi harus diperuntukkan sebagai tempat menyimpan air. Menurut Mahmud et al (2019) reklamasi pantai melalui pengerukan sedimen dan penanaman dengan vegetasi yang sesuai seperti mangrove akan mencegah abrasi dan tsunami. Melalui pengerukan sedimen pantai yang semakin dalam, maka kapasitas daya tampung air meningkat dan aliran air dari hulu lancar, sehingga potensi banjir rendah.…”

“…Pemberdayaan masyarakat setidaknya bisa meningkatkan pengetahuan, teknologi dan pola pikir sebagaimana menurut Mahmud et al (2019) bahwa hasil dari dilakukannya program pemberdayaan harus ada peningkatan pola pikir, pengetahuan dan tindakan dalam pengelolaan SDA dan hutan, agar dalam pelaksanaan program berkelanjutan orang asli Papua (OAP) harus didampingi, dididik, diajari, dibina, dan diarahkan sampai benar-benar mampu. Sebagai contoh buka usaha mebel, Pemerintah harus memberikan pendampingan dimulai dari penyediaan kayu, penyimpanan kayu, pembuatan meja/kursi sampai pemasaran.…”

Flood disaster mitigation modeling through participation community based on the land conversion and disaster resilience

“…The narrow bodies of the rivers, intensity of the constant rainfall, the transformation of the rivers' upstream into plantations, and also between siltation and blockage are due to surficial landslides and eroded water [ 15 , 16 ]. If a river is unable to hold any more water, the water will then find lower inundated areas and can in turn be a major cause of flooding [ 17 ]. Nevertheless, flooding can be minimized if it is not too big.…”