The Bangkok Problem: Three Threats, One Network
By mid-July 2026, Bangkok’s monsoon is at full intensity. The city’s 6,800 kilometers of drainage pipes — much of it built before 1990 — face three simultaneous threats during every heavy rainfall event:
Sewer Overflows (CSO)
When rainfall exceeds 60mm/hour, raw sewage mixed with stormwater bypasses treatment plants and discharges directly into the Chao Phraya River and the city’s historic klong (canal) network.
Water Acceleration
Organic sludge that has accumulated in stagnant canal sections during the dry season suddenly decomposes when monsoon flows re-suspend it, consuming dissolved oxygen and releasing hydrogen sulfide (H₂S) gas.
Crew Fatalities
Every year, sewer workers in the region die from H₂S poisoning or methane (CH₄) explosions when entering unmonitored manholes.
The city’s 2025-2026 “Smart Drainage” initiative mandates real-time monitoring at 200 critical overflow points. The technical requirements are unforgiving: sensors must survive 95% humidity and corrosive H₂S concentrations.
Honde Technology’s Urban Drainage & Black-Smelly Water Series was specified for this project because it combines three capabilities no competing system offered in a single integrated architecture.
The Hardware Triad: Flow, Level, and Gas Safety
RD-600S-02 Anti-Corrosion 3-in-1 Radar Flowmeter
Standard industrial flowmeters use aluminum or painted steel housings which corrode within a single rainy season.
- The RD-600S-02 is finished with a specialized anti-corrosion industrial coating (2,000-hour salt-spray resistance).
- Integrates 24GHz Doppler velocity radar and 60GHz FMCW level radar in a single IP68 housing.
- Provides volumetric data needed to quantify untreated wastewater entering the river.
80GHz Narrow-Beam Level Radar (HD-RWLP654-01)
Bangkok’s manholes are congested with ladder rungs and cable trays that create false stage readings.
- The 6° narrow beam angle functions like a surgical instrument, passing between obstructions.
- Built-in bubble spirit level allows perfect vertical alignment in under 30 seconds.
- High-frequency 80GHz technology ensures ±2mm precision even in turbulent conditions.
RD-EPGD-01 Dual-Probe Toxic Gas Sensor
No flow data justifies sending a crew into an unmonitored manhole. Safety is the priority.
- Monitors H₂S (0–100 ppm) and CH₄ (0–100% LEL) simultaneously.
- Provides pre-entry safety verification for maintenance teams.
- Transmits data via RS485 Modbus-RTU to a unified safety dashboard.
The Honde Full-Stack Architecture
Local Verification & Crew Safety
- Field technicians use the Handmeter for rapid spot-checks and calibration verification.
- Each station connects to a Data Logger with screen for real-time on-site readings.
Wireless Transmission Backbone
- Nodes transmit via GPRS, 4G, WIFI, LoRa, or LoRaWAN modules.
- Data packetized in MQTT Json format for direct integration into BMA central platforms.
Cloud Management & Automated Response
- Cloud software consolidates flow, level, and gas data into a city-wide dashboard.
- The Alarm Relay System:
- Overflow track: Cross-threshold triggers alert BMA flood control.
- Gas safety track: High H₂S levels activate strobe lights and lock covers.
Field Results: BMA Smart Drainage Pilot, July 2026
A pilot deployment of 45 monitoring stations across three high-risk drainage zones: Ratchathewi, Bang Kapi, and the Khlong Saen Saep corridor.
Hardware Deployed
- 45 RD-600S-02 Anti-Corrosion Flowmeters
- 45 80GHz Level Radars
- 30 RD-EPGD-01 Gas Sensors
- 4G and LoRaWAN modules transmitting MQTT Json
30-Day Results
- Recorded 12 significant CSO events with precise data.
- Blocked entry to 4 hazardous manholes. Zero injuries.
- Zero visible degradation on anti-corrosion coatings.
- Automated flood alerts triggered 22 minutes before flooding.
Contact Honde Technology for Urban Drainage Tenders
Honde Technology is a Germany TUV & Alibaba verified manufacturer with 15 years of experience in corrosive, life-critical infrastructure monitoring.
Post time: Jul-20-2026