Temporary drainage and site set-up
Temporary drainage keeps the site workable during construction by diverting surface water, controlling runoff, and helping excavations stay dry enough to dig and pour. It is a core enabling deliverable — distinct from permanent foul and surface-water networks.
This page covers temporary drainage as site set-up. Permanent drainage installation lives under construction-drainage; enabling-works-explained frames the wider package.
Pumping without a consented or agreed discharge route is not a plan. Silt management and neighbour flood risk matter as much as keeping your own trench dry.
Temporary drainage is part of CDM-minded site set-up: control water so excavations, neighbours, and highways are not damaged. It is not optional “nice to have” pumping.
Temporary drainage is site hygiene and neighbour protection as much as dig convenience. Silted runoff onto highways or watercourses creates enforcement exposure that no amount of late pumping erases. Install controls early, maintain them, and remove them cleanly when permanent systems take over.
review Groundworks Contractors in Wandsworth and Groundworks Contractors in Kingston.
When sequence matters
When the site ponds or floods easily; when enabling works include temporary runs or sumps; when deep digs need dewatering attendance; or when permanent drainage is not yet available to receive flows.
It also appears when wet weather stops dig because no temporary falls or pumps were installed at set-up.
Install temporary drainage before opening large reduced-level areas. Digging first and draining later floods the lesson.
When autumn or winter starts make open digs vulnerable; when neighbour land or highways sit downhill of your platform and uncontrolled runoff would create complaints or flooding risk.
Typical sequence
Step 1: Agree discharge and controls
What this step delivers: Legal and practical route locked.
Step 2: Install temporary system
What this step delivers: Falls, sumps, and pumps in place.
Step 3: Maintain through dig
What this step delivers: Weather resilience held.
Step 4: Remove or hand over
What this step delivers: Permanent drainage takes over.
If this matches your project stage, send drawings and site details for a scoped quote — or call to talk through programme and access constraints.
Get an Accurate QuoteWhat each stage delivers
Typical works include temporary ditches or pipe runs, sumps, pumps, silt traps or settlement measures, and maintenance through the dig window. Discharge must follow the agreed route — soakaway, sewer (if consented), or tanker — as the project allows.
Coordinate with cut-and-fill so temporary falls are not destroyed by the next earthworks stage. Remove or hand over temporary systems when permanent drainage takes over.
Mainline installs and maintains temporary drainage as part of enabling or groundworks packages. We do not grant discharge consents.
Silt fences, settlement tanks, or proprietary units may be required depending on discharge sensitivity. Match controls to the receiving environment.
Check pumps daily and after storms. Unattended overnight failures are how trenches refill.
Size sumps and pumps for storm events, not average drizzle. Provide safe electrical supplies and bunded fuel where generators support pumping, and brief night attendance expectations in writing.
Agree discharge route, silt controls, and who maintains pumps out of hours before dig starts.
Name the discharge receptor and permissions status in the method statement.
Programme risks and hold points
- Site prone to ponding
- Enabling includes temporary drainage
- Excavations must stay dry for pour
- Discharge route needs agreement
- Silt control required for neighbours / watercourses
Pre-start and handover checklist
- Discharge route agreement
- Silt / settlement measures
- Pump capacity and out-of-hours plan
- Coordination with earthworks stages
- Removal / handover date
Keeping trades coordinated
Install temporary drainage early, maintain it through peak dig, and remove or convert as permanent systems come online.
Remove temporary runs when permanent systems take over so abandoned pipes do not confuse future as-builts.
Where time and cost usually escalate
Pumping duration, silt failures, and rework from flooded formations dominate. Rate intent: /groundworks-costs.
Fuel and attendance for pumps over long wet periods add up. Consider gravity temporary falls first where levels allow.
Environmental incidents from silty discharge create enforcement risk beyond clean-up cost. Controls are not optional cosmetics.
Where this sequence is commonly used
- Wet clay sites before foundation dig
- Enabling packages in autumn / winter starts
- Deep excavations needing sumps
Frequently asked questions
Is temporary drainage the same as SuDS?
No. Temporary drainage serves the construction period. SuDS and permanent attenuation are design systems for the completed site.
Can we discharge to the road gulley?
Only if permitted. Uncontrolled silted discharge causes highway and pollution problems.
Who owns pump maintenance overnight?
Write it down. Flooded trenches on Monday morning are usually a maintenance ownership failure.
Can temporary drains connect to permanent drains early?
Sometimes if design and protection allow. Protect permanent runs from silt and construction traffic damage.
What information should we send for a quote?
Latest drawings, relevant surveys, access constraints, programme dates, and any known consent or contamination notes. Clearer packs produce clearer prices.
How This Issue Is Normally Diagnosed and Repaired
Follow the typical path from problem identification through to resolution:
We provide these services across the UK, including
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Get an Accurate QuoteNeed temporary site drainage? Send layout, discharge options, and dig programme.
Temporary drainage and site set-up FAQ
Is temporary drainage the same as SuDS?
No. Temporary drainage serves the construction period. SuDS and permanent attenuation are design systems for the completed site.
Can we discharge to the road gulley?
Only if permitted. Uncontrolled silted discharge causes highway and pollution problems.
Who owns pump maintenance overnight?
Write it down. Flooded trenches on Monday morning are usually a maintenance ownership failure.
Can temporary drains connect to permanent drains early?
Sometimes if design and protection allow. Protect permanent runs from silt and construction traffic damage.
What information should we send for a quote?
Latest drawings, relevant surveys, access constraints, programme dates, and any known consent or contamination notes. Clearer packs produce clearer prices.
Need project guidance?
Share your site details and priorities. We will outline a practical scope, likely timeline, and next steps.