Advanced Arid Swale Designer (AASD)

Professional hydraulic and check dam design, optimized for arid region constraints (Velocity ≤ 1.2 m/s, Drawdown ≤ 24 hrs).

Methodology Summary 📋

This tool employs the Rational Method (Q=CIA) to determine the peak design flow (Q_peak) across a spectrum of rainfall intensities (IDF curve) and defined catchment areas. The time of concentration (T_c) is determined by the rainfall duration that yields the highest calculated flow.

The resulting Q_peak is then analyzed using Manning's Equation for trapezoidal open channels to find the corresponding normal flow depth (y_c) and flow velocity (V). Compliance checks ensure the flow depth does not exceed the design maximum, and the velocity remains below the erosion limit (1.2 m/s).

For arid climate constraints, the design assesses check dam necessity to control velocity/slope. Drawdown time is calculated by comparing the required Water Quality Volume (WQv) with the infiltration rate of the filter media, ensuring the pool empties within the specified limit (≤ 24 hrs).

Project & Swale Configuration 📄

Project Identification

Project Name

Design Engineer

Swale Reference ID

Swale System Type

Swale Design Type

Catchment & Hydrology Inputs 🌧️

Rainfall Data Source

Rainfall Data Region

Design Return Period

Rainfall Intensity Spectrum (I)

These values are loaded automatically based on your Region/Period selection above.

Duration (min) Intensity (mm/h) Action

Catchment Area Definition (Runoff Coefficient C)

Surface Type	Area (m²)	C (Runoff Coeff.)	Action

Geometry & Hydraulic Sizing 📐

Channel Dimensions

Swale Length (L) (m)

Channel Base Width (W_b) (m) (Min 0.6m)

Side Slope Z (H:V, e.g. 4:1)

Max Design Flow Depth (y_design) (m)

Hydraulic Parameters

Longitudinal Slope (S_L) (%) (Max 4.0%)

Manning's Roughness Coefficient (n)

Arid Constraints & Check Dams 🚧

Soil & Filtration Media

Native Soil Infiltration Rate (mm/hr)

Filter Media Depth (D_media) (m)

Filter Media Design Rate (f_media) (mm/hr)

Enable Check Dam Design (Energy Dissipation)

Check Dam Specifications

Check Dam Height (m)

Cost per Check Dam ($)

Design Results & Compliance Checks ✅

Detailed Flow Calculations (Full Duration)

Duration (min)	Intensity (mm/h)	Peak Flow Q (l/s)	Inflow (m³)	Outflow (m³)	Required Storage (m³)	Flow Depth (m)	Velocity (m/s)	Status

Cross-Section View

3D Swale Visualization

Blue: Water | Grey: Check Dams | Color Reflects Swale Type

Longitudinal Profile View (L-View)

Compliance Status at a Glance

Hydraulic Capacity

Max Flow (Q_peak):-- l/s

Calc. Depth (y_c):-- m

Status (y ≤ y_des):PENDING

Arid Constraints

Max Velocity:-- m/s

Drawdown:-- hrs

Status (≤ 24h):PENDING

Cost & Dams

Total Cost:-- $

Dam Needed:PENDING

Dam Count:--

Detailed Design Summary & Volume Analysis

Project Designs Summary

Ref ID	Type	Max Q (l/s)	Max Vel (m/s)	Check Dams	Total Cost ($)	Status	Actions
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