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Rainwater Resource · Sponge City Solutions
National high-tech enterprise · Since 2013

Keep every drop of rain
for the next generation

End-to-end sponge-city rainwater systems

In-house rainwater control and utilisation technology: harvesting, storage and reuse solutions engineered for sponge-city and eco-city projects across China & Southeast Asia.

  • PP modular storage tanks
  • Smart first-flush diverters
  • Packaged plant rooms
  • PLC smart control systems
Sponge city rainwater project78+Projects delivered
0Founded
0Projects delivered
0Max module load
050-year creep validated
Products

Product CenterRainwater harvesting & reuse systems

Installed at the inlet of the harvesting line. A rain sensor watches the rainfall signal: the dirty first flush is discharged to the municipal drain, then the device automatically switches to collect clean rainwater — screening, first-flush diversion and flow splitting in one unit.
Injection-moulded PP modules assemble into an underground tank. Wrapped in composite geomembrane it becomes a storage or infiltration basin. Fast installation, high load capacity, no mosquito or algae breeding — suited to estates, industrial parks, plazas and protected farming.
Outdoor galvalume cabinet with fluorocarbon coating: insulated, moisture- and noise-proof, IP54 rated, service life over 10 years outdoors. Houses automatic self-cleaning filters, UV sterilisers and pressure tanks, with full automation, self-diagnosis and alarms for 24/7 rainwater management.
Same outdoor cabinet family without the control system, for automatic self-cleaning filters, UV sterilisers and pressure tanks. Custom sizes, powder-coated cold-rolled steel or stainless steel.
Outdoor fluorocarbon cabinet with toughened-glass window, holding PLC, inverter, HMI, electrical components, pressure tank and sensors. Full automation, smart control, self-diagnosis and alarms; configurable per application.
Combines system control with filtration and disinfection (self-cleaning filter plus UV). Variable-frequency control of reuse pumps, automatic or manual pump/valve operation, auto backwash, and adjustable filtration precision by changing mesh.
Horizontal HDPE vessel optionally fitted with biological media, automatic cleaning and multi-media filters, UV steriliser, dosing and pressure tank, with manhole cover. No power inside the chamber, so no damp or flooding damage; buries without spoiling the landscape.
HDPE shell, stainless support frame, dedicated filter bag and level sensor. Works on hydraulic principle with no electricity; direct burial, corrosion- and ageing-resistant, flexible sealed connection to plastic pipework.
How it works

From survey to hand-overEnd-to-end delivery, proven on 78+ projects

Site survey & catchment

Catchment

Design & module selection

Design

Excavation & base slab

Excavation

Geomembrane welding

Geomembrane

Module assembly & backfill

Assembly

Skim wells & pipework

Pipework

Equipment commissioning

Commissioning

Inspection & hand-over

Hand-over

Projects

Project CasesSponge city projects since 2013

Sponge-city design delivered alongside the stadium and its roads. PP modular storage with smart first-flush diversion supplies irrigation and road washing.

Nansha District, Guangzhou City

Hospitals demand higher reuse quality: self-cleaning filtration, UV disinfection and pressure tank included; water feeds toilets, irrigation and cooling make-up.

Zengcheng District, Guangzhou City

Rooftop and road runoff collected centrally; storage volume meets the local annual runoff control rate while cutting peak flow.

Wuqing District, Tianjin

The research campus pairs passive buried filtration with modular storage, reducing mechanical equipment and O&M cost.

Zhongshan City, Guangdong Province

Plaza runoff passes screening and first-flush diversion before entering underground storage, later reused for landscape and irrigation.

Zhuhai City, Guangdong Province

Food and beverage plants are water intensive; harvested rain supplements cooling systems and housekeeping, easing municipal supply load.

Nanhai District, Foshan City

Campus retrofit combines a rain garden with a modular tank, serving both teaching demonstration and daily irrigation.

Yantian District, Shenzhen City

Rooftop rainwater is diverted of first flush then stored for dust suppression on sports fields and WC flushing.

Nanhai District, Foshan City
Insights

News & InsightsNews & industry insights

Hainan rainwater harvesting system _ professional solution _ Xihai Rainwater _ supporting the green development of tropical islands
In the context of the construction of Hainan Free Trade Port and the promotion of the Ecological Civilization Pilot Zone, the scientific utilization of rainwater resources becomes particularly crucial. Guangxi Xihai Rainwater Environment Technology Co., Ltd., leveraging its in-depth understanding of the tropical island climate characteristics, provides professional rainwater collection system solutions for the Hainan region. As a source factory with independent production capabilities, our series of products developed for the special environment of Hainan have achieved remarkable results in practical applications.

Specially designed to cope with tropical climate characteristics

The unique environment of high temperature, high humidity, and high salt spray in Hainan region poses higher demands on rainwater collection systems. The modular water storage system we have adopted undergoes special anti-corrosion treatment, and its protective layer has passed a salt spray resistance test lasting over 2000 hours, ensuring long-term stable operation in a marine climate. The system has undergone rigorous structural safety verification, effectively resisting the impact of severe typhoon weather. Additionally, it is equipped with an intelligent monitoring system to grasp the real-time operating status of the equipment.

Verified by multiple successful project practices

Multiple projects we have implemented in the Hainan region have achieved excellent results. In a coastal area project, the rainwater collection system has achieved comprehensive coverage of regional green irrigation, significantly saving annual water costs. In the field of municipal infrastructure, the system collects a considerable amount of rainwater annually, effectively alleviating urban drainage pressure. These practical cases fully demonstrate the reliability and practicality of the system under tropical conditions.

Comprehensive local service support

To ensure the continuous and stable operation of the system, we have established a comprehensive technical service network in Hainan. Our localized team can provide timely technical support and maintenance services, and the equipped professional monitoring platform enables real-time tracking of the system's operational status. Furthermore, we have established an emergency response mechanism to ensure the safe operation of the system under special weather conditions.

Continuously innovate and optimize solutions

We have always been attentive to the new demands for rainwater management in Hainan region, continuously upgrading our technology and optimizing our solutions. By constantly summarizing project experience and refining system design, we strive to provide more precise and efficient solutions for our Hainan customers. Our professional team will offer personalized technical consultation and system design services based on the specific characteristics of each project.Xihai Rainwater is committed to providing technical support for the sustainable development of Hainan through professional and reliable rainwater collection systems. We will continue to leverage the technological advantages of our source factory to contribute to the construction of Hainan Free Trade Port and the development of ecological civilization.

Guangdong Xihai Rainwater Environment Technology has focused on rainwater control and utilisation since 2013, earning national high-tech enterprise status. Products serve residential estates, parks, industrial and agricultural facilities and islands.

Ready to keep every drop of rain?

Free feasibility study and containerised export for projects in Vietnam, Malaysia, Singapore, Thailand, Indonesia and the Philippines.

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