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💧 Drainage & Hydrologic Design - Complete Guide

Stormwater management, pipe flow hydraulics, culvert design, infiltration modeling, and regulatory compliance resources.

15
Knowledge Pages
1
Interactive Tools
5
Case Studies
6
Resources
21
Lessons
📖 15 Knowledge 🔧 1 Tools 🏗️ 5 Applications 📦 6 Resources
⏱️ 620 Min Reading
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Engineering Workflow

🔍 Understand → 📖 Learn → 📐 Calculate → 📋 Reference → 📦 Resources → 🏗️ Apply
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Drainage & Hydrologic Design - Complete Guide

Drainage and hydrologic design is how engineers plan systems to safely collect, move, and release rainwater and runoff s...
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Quick Start

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Drainage & Hydrologic Design Calculator

Multi-tab calculator for Drainage & Hydrologic Design

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Knowledge Base

15 pages
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Key Concepts

Drainage &Hydrologic DesignRational Method forPeak Stormwater RunoffTime of Concentration(Kirpich, FAA, SCS)Manning’s Equation forOpen Channel FlowSWMM Input Parameters& CalibrationCulvert HydraulicDesign (FHWA HDS-5)Infiltration Modeling(Horton & Green-Ampt)LID BioretentionStandardsNPDES Phase IIComplianceStorm Sewer PipeSizing (Hazen-Williams)

Visual overview of key concepts and their relationships

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Real Projects

5 cases
Urban Mixed-Use Site (Austin, TX) Bioretention Vol = 1.4 ac-ft Permeable Pavers Detention Vault Qout = 28 cfs Sensor Runoff Infiltration Overflow: 28 cfs LID Volume Reduction: 78% Meets Austin WPD LID Urban Mixed-Use Redevelopment

Urban Mixed-Use Redevelopment in Austin, TX

12-acre infill development with 60% impervious cover and adjacent floodplain constraints

Challenge: Meeting City of Austin Watershed Protection Department (WPD) LID requirements wh...
Highway Interchange ReconstructionSeattle, WA — TMDL-Compliant Stormwater ManagementExisting Highway (Maintained During Construction)Stormwater InflowOil-Water
SeparatorC_in → C_outFiltration SwaleE = 89%Extended Detention
with Sediment ForebayY_s = 4.2 ftVegetated Filter StripChallenge: Maintain Service
& Meet WA Ecology TMDL LimitsCu Reduction: 94% • Zn Reduction: 87%Outflow to Receiving Water

Highway Interchange Reconstruction in Seattle, WA

I-5/SR-520 interchange upgrade with 3.2 miles of new storm conveyance and 11 major culverts

Challenge: Maintaining service during construction while meeting WA Dept. of Ecology’s diss...
Pump Station EL_pump = 8.2 ft NAVD88 Stage 1 Stage 2 Surge Tank V = 1,240 ft³ Backflow Preventer HGL = 12.8 ft NAVD88 (EL_pump + h_f + h_surge) AI Control Unit SP_t = SP_base + f(tide, rain) ±3.2 ft range NOAA CO-OPS Tide NWS Rain Forecast Space-constrained site — no elevation increase

Coastal Resilience Retrofit for Miami-Dade County Pump Station

Upgrading aging 8000-gpm lift station to withstand 100-year SLR + storm surge + increased rainfall intensity

Challenge: Integrating sea-level rise projections into hydraulic grade line analysis withou...
Inflow Pretreatment Vault V = 12,500 gal (110% max container) Spill Berm Forebay Alum sludge + Fe₂O₃ E = 93.4% Wetland Emergent macrophytes A = 8.7 ac HLR-based design Outflow Phosphorus Removal Wetland Treatment Spill Containment Berms

Industrial Park Stormwater Master Plan in Indianapolis, IN

320-acre logistics park with 87% impervious cover, legacy soils (HSG-C), and proximity to White River TMDL restrictions

Challenge: Achieving 90% annual phosphorus load reduction while accommodating truck traffic...
Mountainous Ski Resort Stormwater Retrofit — Aspen, COV_max = 21.3 ft/sRock-lined stepped chuteBioswale (Carex spp.)Cold-tolerantSediment basint_d = 4.8 minVortex separatorRoaring Fork River (Class I trout stream)Freeze-thaw resistance: N_f = 1,280 cyclesChuteBioswaleSediment Basin

Mountainous Ski Resort Stormwater Retrofit in Aspen, CO

Upgrading 1970s-era concrete channels on 32° slopes serving base village and parking lots

Challenge: Preventing erosion and sediment delivery to Roaring Fork River (Class I trout st...
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Downloads

6 resources
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FHWA HDS-5 Culvert Design Manual (2022 Edition)

pdf
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NRCS TR-55 Quick Estimation Workbook (Excel)

excel
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EPA SWMM 5.2 Input Template Generator

excel
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State-by-State NPDES Phase II Checklist (2024)

pdf
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LID Performance Monitoring Protocol (ASCE/EWRI Standard)

pdf
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Drainage Design Drawing Standards (AIA/ASCE Joint Spec)

pdf
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Learning Path

21 lessons

Master Drainage & Hydrologic Design through a structured learning path — from fundamentals to advanced applications.

Your Progress 0/21 completed
30 Getting Started with Drainage & Hydrologic Design 31 Rainfall-Runoff Processes & Watershed Delineation 32 Computing Time of Concentration: Kirpich vs. SCS vs. FAA 33 Open Channel Flow: Uniform, Critical & Gradually Varied Flow 34 Manning’s Equation: Solving for Velocity, Slope & Roughness 35 Storm Sewer Sizing & Energy Grade Line Development 36 Culvert Capacity: Inlet vs. Outlet Control Identification 37 Infiltration Physics: Horton, Green-Ampt & Philip Models 38 Calibrating Infiltration Parameters from Field Data 39 SCS Unit Hydrograph: Derivation & Application 40 Storage-Indication Routing for Detention Basins 41 NPDES Phase II: What Every Designer Must Know 42 Interpreting Local LID Ordinances: From Concept to Submittal 43 Bioretention Sizing & Media Specification per Soil Type 44 Performance Validation: Monitoring Protocols & Reporting 45 Log-Pearson Type III: Theory, Fitting & Uncertainty Bands 46 Applying Flood Frequency Results to Design Standards 47 SWMM Project Setup: Subcatchments, Nodes & Links 48 Calibrating SWMM to Observed Flow & Water Quality Data 49 Incorporating Climate Projections into Drainage Design 50 Sea-Level Rise Adaptation: Pump Stations & Outfall Design
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News & Updates

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