✈️ Hydrological Survey for an Airport
📌 Objectives
- Assess existing surface & subsurface water conditions
- Understand catchment behaviour & runoff patterns
- Determine flood‑risk zones
- Support design of drainage, storm‑water & water‑harvesting systems
🔍 Key Components
- Topographic Survey & DEM: Total station, drone or LiDAR to map slopes, ridges & depressions.
- Rainfall & Climate Data: Intensity‑duration‑frequency (IDF) curves, evaporation & temperature stats.
- Soil & Infiltration Tests: Soil classification and double‑ring infiltrometer readings.
- Runoff Analysis: Rational Method / SCS‑CN for 1:10 & 1:25 design storms.
- Groundwater Conditions: Water‑table depth, aquifer type & recharge potential.
- Hydrological Modelling (optional): HEC‑HMS, SWMM, MIKE SHE for rainfall‑runoff simulations.
🌀 Airport Drainage Pattern Design
📌 Design Goals
- Avoid runway & taxiway flooding
- Prevent erosion and pavement damage
- Separate stormwater from sewage systems
- Ensure rapid water removal during storms
🔧 Steps in Design
-
Runoff Estimation —
Use catchment areas, rainfall intensities, and runoff coefficients. -
Surface Drainage Design —
- Longitudinal slope of runways: typically 0.5% to 1.5%
- Transverse slope: 1.5% to 2% for quick runoff
- Paved drains, open trapezoidal channels, grassed swales
-
Subsurface Drainage (if needed) —
- For areas with a high water table or poor percolation
- Use perforated pipes, filter material, and sumps
-
Drainage Structures —
- Catch basins at regular intervals
- Manholes, inlet grates, storm chambers
- Culverts for crossing taxiways or roads
-
Stormwater Retention & Treatment —
- Detention basins, retention ponds
- Oil-water separators (for fuel spillage zones)
- Recharge pits or infiltration trenches
-
Outlet and Disposal —
- Discharge into nearby water bodies (with permission)
- Connect to municipal storm network
- Design for non-erosive velocities at outlets
📞 Need an Airport Hydrological Assessment?
From detailed surveys to full drainage‑system layouts, Bhoojal Survey delivers data‑driven, standards‑compliant solutions for airports nationwide.
Call +91‑96918 58058
