A padel court in Mumbai receives more rain in one afternoon during peak monsoon than some European cities receive in a month. If the drainage is not designed for that, the court is unusable for days at a time, not because of heavy weather, but because of a drainage specification written for a different climate.
Most padel courts in India are built with drainage as an afterthought. A single drain point in one corner, a slab that vaguely slopes in the right direction, channels that were sized for light rain. Then the first serious monsoon arrives and the operator is standing in 40mm of water on what was an expensive sports facility.
This guide explains what padel court drainage actually requires in Indian conditions, how to specify it correctly, and what it costs to get it right versus what it costs to fix it wrong.
Why Padel Courts Are Particularly Vulnerable to Water
Padel courts are enclosed structures. The glass walls and wire mesh fencing mean the court interior catches rainfall directly and has limited natural escape paths. Unlike an open sports surface where water can run freely in any direction, a padel court funnels water into a defined area with only engineered drainage paths as exits.
An outdoor padel court playing area is 200 square metres. During Mumbai's peak monsoon, 200mm of rainfall in a day means 40,000 litres of water landing on that surface in 24 hours. A court with one 100mm drain point cannot clear that volume fast enough. Water backs up. The turf becomes waterlogged. Infill material migrates. And the court is unplayable until it drains naturally, which, without proper drainage design, can take two to three days.
This is not a problem that affects every event. But it affects every heavy monsoon event. In Delhi NCR and Lucknow, where rainfall is moderate (700-900mm annually), a well-specified drainage system handles it easily. In Mumbai, Pune, Chennai, and coastal India — where courts can see 60-80mm per hour at peak — a poorly designed system is unusable multiple times per monsoon season.
The Four Elements of Correct Padel Court Drainage
Getting drainage right requires four things working together. Missing any one of them creates a problem.
1. Slab Cross-Fall
The concrete slab must be cast with a deliberate cross-fall, a slope built into the surface that directs water toward the drainage channels. Without cross-fall, water sits level on the surface and drains only by evaporation or seepage.
Correct cross-fall specification: 1% to 1.5% fall across the short axis of the court (10m width), directing water toward one long side. Some designs use a roof-ridge fall with 0.75-1% either side to a central channel on each long side.
What 1% means in practice: a 10m court has a fall of 100mm from one side to the other. Standing at the high side, you would barely notice the slope. The surface looks flat. But that 100mm of fall is enough to move water reliably to the perimeter.
Courts with less than 0.5% cross-fall do not drain reliably. Water pools in low spots and sits. Courts with more than 2% cross-fall feel noticeably tilted and affect ball bounce at the edges.
2. Perimeter Drainage Channels
Perimeter channels catch the water that the slab fall directs toward the court edges. They run along the length of the court on one or both long sides, and typically across the short sides as well.
Minimum channel specification:
- Width: 150mm minimum
- Depth: 100mm minimum
- Material: Cast concrete channel with removable steel grating, or precast channel units
- Fall within channel: Minimum 0.5% toward the outlet point
A channel that is too narrow fills quickly under heavy rain and water overtops it back onto the court surface. A channel without a grating fills with sand infill from the turf and blocks within six months.
3. Outlet Points and Connection to Site Drainage
The channels have to go somewhere. The outlet points connect the perimeter channels to either a soakaway (in sites with good soil permeability) or a direct connection to site or municipal drainage.
For outdoor courts in Indian urban sites: Connection to site drainage or a properly sized soakaway is required. Depending on rainfall intensity for your location, calculate the drainage outlet capacity required:
These are rough guides. Your civil engineer should calculate outlet sizing based on catchment area and local peak rainfall data.
4. Sub-Surface Drainage Under the Slab
On sites with poor soil permeability, a drainage layer below the concrete slab prevents water from sitting under the base and creating upward pressure during heavy rain. This is particularly relevant for:
- Sites in low-lying areas
- Sites with clay soils that have low permeability
- Sites where groundwater rises during monsoon
A 150-200mm layer of clean crushed stone (no fines) below the slab acts as a drainage blanket. It also serves as the granular sub-base required for structural reasons, so this is not an additional cost item but an integration of two functions into one layer.
What Happens When Courts Skip Drainage
Rahul developed a three-court padel facility in Noida in 2023. His contractor installed a single 75mm outlet at one corner of the courtyard and cast the slab without a cross-fall, arguing the site "has a natural slope." The natural slope was 0.3%, not enough to move water quickly in heavy rain.
During the first monsoon season, two of the three courts had standing water after each significant rain event. Courts 1 and 2 took between 18 and 36 hours to drain after a 50mm rain event — and Noida's peak monsoon regularly delivers 60-80mm in a single afternoon. Court 3, at the natural low point, collected water from the other two courts and took even longer. Over three months of monsoon, Rahul lost an estimated 40 to 50 peak bookings per court, roughly Rs 3-4 lakh in revenue.
In 2024 he had drainage channels retrofitted. The channels had to be cut into the concrete around the court frames, difficult work that cost Rs 3.8 lakh per court and required the turf to be lifted and re-laid. The entire retrofit cost Rs 12 lakh. Proper drainage at construction would have cost Rs 1.5-2 lakh for all three courts.
Indoor Courts: Different Problem, Same Principle
Indoor courts don't receive direct rainfall, but they still need drainage. Water enters from cleaning, from players who have come in from outside in wet weather, and occasionally from roof leaks or condensation.
For indoor courts, drainage requirements are simpler:
- A single central drain point or two corner drain points in the turf area
- Slab fall of 0.5% toward the drain points
- Floor drains in the changing rooms and reception area sized for cleaning water flow
The drainage design for an indoor padel facility is significantly simpler than outdoor, but it cannot be entirely absent. A completely flat indoor court with no drain points has no way to manage water from court cleaning, which happens daily in commercial facilities.
Drainage and Turf Interaction
The synthetic turf surface on a padel court is permeable, water passes through the turf into the infill and then through the backing to the slab surface. This means the slab drainage has to work even though the turf appears to absorb water initially.
Low-quality turf backings with inadequate perforation holes (smaller than 8mm diameter, spaced more than 100mm apart) restrict water movement through the turf, causing it to sit in the pile longer and increasing waterlogging time. Specify turf with a backing perforation rate of at least 60 holes per square metre to ensure water moves through to the slab surface where drainage can do its job.
The infill sand also matters. Rounded silica sand with a particle size of 0.4-0.8mm drains freely. Angular or fine sand compacts and slows drainage. If your court has drainage but is still slow to drain after rain, check the infill specification, it may be holding water in the pile.
Specifying Drainage: What to Ask Your Contractor
Before accepting any padel court construction quote, get written answers to these drainage questions:
- What is the slab cross-fall, and in which direction does it drain?
- What are the dimensions of the perimeter drainage channels?
- What is the channel fall and where do the outlets connect?
- What is the outlet pipe diameter and where does it discharge?
- Is there a drainage layer below the slab, and what material and depth?
- What is the turf backing perforation specification?
A contractor who answers all of these specifically is building a court that will work in monsoon conditions. A contractor who says "the slab will drain naturally" is describing a court that will pool water every monsoon season for as long as you own it.
What to Get Right
- Cross-fall is not optional. Cast 1% to 1.5% into the slab. Without it, water does not move to the channels regardless of how good the channel specification is.
- Perimeter channels on all sides. Not one corner drain. Channels running the length of both long sides at minimum, with falls to outlet points.
- Size outlets for your rainfall. Mumbai and Chennai need larger outlets than Delhi or Bengaluru. Delhi NCR at 40-60mm/hour peak still needs correctly sized drainage — "low rainfall" does not mean drainage is optional. Use local peak rainfall intensity to size correctly.
- Drainage cannot be retrofitted cheaply. Channels cut into a finished slab around a structural frame cost three to five times more than channels built during construction. Design it in from the start.
- Turf backing perforation matters. 60+ holes per square metre, 8mm minimum diameter. This is not a premium spec; it is the minimum for a court that drains in monsoon conditions.
Drainage is part of the base — not an add-on. Read our guide to padel court base construction for how the slab, sub-base, and drainage channels work together. For full project costs including drainage, see the padel court construction cost guide. To discuss drainage design for your specific site and city, visit our padel court construction page.
