First choose one river and, together with Ita Seoul, agree a survey section of about 1 km. Walk that section and mark the spots where trash collects, such as confluences, sharp bends, bridges and weirs, then pick points your team can reach safely and regularly.

Contact your local council or river authority to explain the activity and agree how it will run. The playbook includes a ready-made coordination request form.

Start with at least 4 people and grow to at least 10 by build day (one drifter each; youth teams include two adult leaders). Agree a lead coordinator, a meeting point and a group chat. You can do this step before your kit arrives.

When your kit arrives, hold a build day. Each person brings one communication board, installs the firmware from a web browser and assembles one drifter. Place the kit’s internal parts and the board inside a PET bottle or storage container and seal every joint with waterproof tape. The team activates its SIM cards (for student teams, in the name of a teacher or the school; nano size, with a voice and data plan).

Follow the assembly video and blueprints, and check every part against the parts list. Run a float test in a bucket or bath, confirm each drifter appears on the platform, then give it a name. Make your recovery net and hook by following the manual.

Hold a waterside safety session before your first release. At least two adults attend every activity. Under-18s observe and record from the bank only. Only trained adults use the nets and hooks, and adults recovering at the water’s edge wear life jackets. Bring a first-aid kit. Nobody enters the water or the mudflats. Near the river mouth, check tide times in advance.

Split roles into releasing, following, recovering and recording. A team of 10 can form two groups of five and cover two bottlenecks.

Your first release is a test. Once the drifters are assembled, float them for just 50 to 100 m in your section and recover them straight away to check they stay watertight and send a location signal. If all is well, extend the distance step by step.

Run ten river sessions on agreed days. Release your drifters upstream, follow them on the live map and note where they slow down, circle or stop. Your recorder logs the weather, water level and any trash along the route.

Drifters are not always recovered on the day they are released. They send their position as they travel and are recovered at the end of the section or wherever they stop. Agree the timing and method of recovery with Ita Seoul in advance, and check the number released against the number recovered. Recovering every device keeps the project from adding litter to the river.

Never go to the river during a heavy-rain warning, within 24 hours after it is lifted, or while the water is high.

Finish each outing with refreshments and a quick team debrief.

세션이 끝나면 플랫폼에 데이터를 업로드하고 확인하여 공유 하천 병목 현상 지도에 추가하세요. 표류물이 어디에 얼마나 오래 머물렀는지 함께 살펴보고, 그 결과를 바탕으로 새로운 쓰레기통 설치, 특정 지역에 대한 청소의 날 지정, 쓰레기 수거함 설치 등 간단하고 실용적인 권장 사항을 제시하세요. 작성한 지도를 지역 의회, 학교, 지역 단체에 발표하고 지역 언론을 초청하여 결과를 공개하세요. 간단한 발표 행사를 통해 팀의 성과를 축하하세요. 마지막으로, 다른 지역 사회와 경험을 공유하고, 이 복제 가이드를 활용하여 그들이 하천 모니터링 네트워크를 따라 더 멀리 떨어진 곳에 자체적인 모니터링 지점을 설치할 수 있도록 지원하세요.