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Hydrological Analysis Lab

Rainfall Calculator.

Analyzes precipitation patterns from historical data. Provides NBC Part 9 drainage compliance assessment and advanced stormwater runoff calculations.

Catchment Site

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Mumbai

Hydrology Parameters

Catchment Area1000 sq.m
MicroMacro Site

NBC Part 9 Assessment

Zone Classification
Very High
> 2000 mm/year
Structural Mandate
Flood-resilient design per NBC 9.5
Annual Total
2,667.8
mm
Rainy Days
140
days
Max Daily
136.5
mm
Mean Intensity
19.1
mm / day

Stormwater Runoff Flow

Calculated via the Rational Method (Q = CiA / 360) as outlined in NBC 2016 Part 9 Section 9.3. Derived from extrapolated peak hourly intensity.

Peak Intensity (i)
45.5 mm/hr
Catchment (A)
0.100 ha
Peak Runoff (Q)
10.1
Liters / Sec

Empirical Data Matrix

TimelineAggr. Rain (mm)Rainy DaysMax Event (mm)Avg Int.
Jan0000 mm/d
Feb0000 mm/d
Mar0000 mm/d
Apr1.7010 mm/d
May184.2125415.3 mm/d
Jun701.526100.927 mm/d
Jul516.7315116.7 mm/d
Aug641.529136.522.1 mm/d
Sep466.926125.718 mm/d
Oct143.21334.311 mm/d
Nov12.134.24 mm/d
Dec0000 mm/d
Annual Summation2,667.8140136.5—
Extracted from Open-Meteo ERA5 Reanalysis Dataset (11km Res)

What is Rainfall Intensity Calculator?

Analyze annual precipitation patterns with NBC Part 9 drainage compliance. Uses Open-Meteo historical data for monthly breakdown, max daily intensity, and rainy day statistics.

Technical Overview

Determine peak rainfall intensities for stormwater and roof drainage design. Compliant with NBC Part 9, this tool uses historical meteorological data to provide max daily intensity and return period statistics for Indian cities.

Architectural Precision

NiyamX bridges the gap between design and regulation. Our algorithms are meticulously calibrated against NBC 2016 and international standards, ensuring your vision translates seamlessly into a compliant, buildable reality.

Scaling Beyond Just Rainfall Intensity Calculator

NIYAMX CO-PILOT
POWERED BY AI.

Our professional platform helps you generate code-compliant reports, verify thousands of municipal bylaws, and automate your entire AEC documentation workflow.

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PLATFORM CAPABILITIES

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Instant citations from NBC 2016 & State DCRs

Plan Verification

Automated checks for architectural layouts

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Professional PDF & DXF report generation

Version Control

Track code changes and city-wise updates

Trusted by 5,000+ Architects & Developers Across India

Mastering the Rainfall Intensity Calculator

A professional guide to leveraging the Rainfall Intensity Calculator for advanced technical analysis and regulatory verification.

1

Configure Project Parameters

Enter your specific site dimensions and project constraints. Our engine will real-time validate your inputs against technical thresholds.
2

Analyze Compliance Insights

Instantly visualize results on the pro-grade dashboard. Verify your design against NBC 2016 with mathematical certainty.
3

Generate Executive Report

Download a comprehensive CSV report, ready for client presentation or municipal submission.

Common Questions

1
Why is rainfall intensity important for roofs?

It determines the required size and number of rainwater down-takes to prevent flooding on terraces and roofs during heavy storms.

2
Which NBC part covers drainage?

NBC 2016 Part 9 (Plumbing Services) provides the guidelines and formulas for sizing drainage systems based on rainfall intensity.
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