Clear litter from a Sava riverbank access point in Belgrade (2026-07-20)

The Sava riverbank downstream of Belgrade's center collects plastic and debris that washes down with no regular collection point nearby. Standard: Serbia's national river-basin management plan for the Sava + SDG 6 & 14. Proof: Before/after photo plus bag count Method (Serbia's national river-basin management plan for the Sava + SDG 6 & 14.): 1. Walk the accessible bank stretch and collect loose litter by hand. 2. Bag it as you go, separating recyclables where possible. 3. Avoid entering the water or unstable bank edges. 4. Photograph the cleared stretch. 5. Log the bag count and drop the waste at the municipal transfer point or licensed collector the host names. Done when: Before/after photo plus bag count

Where

Sava riverbank access point, Belgrade, Serbia

Pay

$200 proposed

This packet is not funded yet, so this figure is a proposed price and not money waiting in escrow. If a buyer funds it, approved proof settles that price onchain. If nobody funds it, approved proof earns provable credit toward the work instead of cash. You see which before you claim, never after.

Proof

Before/after photo plus bag count

This is exactly what gets it approved. Nothing settles without it.

Level

entry

Open until

2026-08-19

How this work is done

A documented method, so this packet comes out the same whoever does it. Typically 30–60 minutes. Method of record: EPA dry-weather / AMD field screening

Bring

• GPS phone
• pH meter or strips
• conductivity meter
• ammonia + iron test kit as specified
• surfactant screen if specified
• gloves
• camera

Steps

1. 1. Navigate to the outfall/reach; record GPS; photograph it, capturing any visible flow or staining.
2. 2. Note whether flow is present in dry weather (yes/no).
3. 3. Measure and record pH, conductivity, and each specified analyte per kit instructions.
4. 4. Log any color, odor, floc, or aquatic-life observation.
5. 5. Enter all readings with units, GPS, time, and photos into the proof record; sign.

If it does not match the plan

• Dry-weather flow present with elevated conductivity/ammonia/surfactants -> flag suspected illicit discharge for the responsible agency.
• pH < 6 with visible iron floc -> tag suspected acid mine drainage; recommend metals lab panel.

What counts as done

• pH + conductivity recorded with units
• Each specified analyte recorded with a value
• Dry-weather flow present? recorded yes/no
• GPS waypoint + timestamped photo

Proof is measured against these, not judged by taste.