Slope
Drainage
Soil
Water
Five things to check on site
A plot can look perfect on a dry afternoon. Walk it with this list and the drainage problems show themselves long before the registration date.
Open the field notes
Most costly plot problems leave visible traces long before a builder arrives. Cracks, damp patches and washed-out edges are the land telling you how water behaves here.
Photograph what you see, note the date and the weather, and compare the plot again after the next heavy shower. Two visits in different conditions reveal more than any brochure.
Take your notes to the seller and your engineer: each sign has a known fix, but the cost belongs in your budget before you sign.
When drainage channels fail, the problem is rarely the water itself. Almost every time I’ve traced a clogged trench or a silted-up outlet back to the root cause, it’s been the soil moving with the flow. Geotextiles solve that by letting water through while holding fines in place, keeping gravel clean, and making sure the […]
Steep slopes in India fail for a few predictable reasons: runoff cuts grooves into bare soil, water builds up behind weak layers, and loose topsoil slides before vegetation can take hold. Geotextiles help interrupt that process by holding soil in place, slowing runoff, filtering water, and supporting vegetation until the slope becomes stable on its […]
Geotextiles are permeable fabrics that handle several critical jobs in the ground: they separate, filter, drain, protect, and reinforce soil layers. For erosion control, their main role is keeping soil in place while letting water pass through — a combination you need almost everywhere on a site once the monsoon hits or a slope is left […]
Topsoil and turf
Compacted subgrade
Geotextile
Drainage layer
Crushed stone bed
Swipe sideways to see the full section →
A geotextile sheet keeps fine soil out of the stone layer, so the drainage bed stays open for years instead of clogging after one season.
Perforated pipe in clean gravel collects water below floor level and leads it by gravity to a safe outfall away from the house.
The subgrade is rolled in thin, damp layers. Even compaction is what stops a floor slab from settling and cracking unevenly.
| Surface type | Recommended slope | Field note |
|---|---|---|
| Ground next to the house | 2–5% | Falls away from the walls so roof water never reaches the plinth. |
| Paved courtyard | 1–2% | Enough to clear puddles without feeling tilted underfoot. |
| Driveway and access road | up to 10% | Steeper grades need a rough surface and a drain at the gate. |
| Earth drain side walls | 1 : 1.5 | Gentle sides resist collapse in loose or sandy soil. |
| Perforated drain pipe | 0.5–1% | Keeps water moving without scouring the gravel bed. |
| Natural ground for building | under 10% | Steeper plots usually need terracing or retaining walls. |
Values are common planning guidelines. Confirm the final levels with your engineer for the soil on your plot.
