Detention Pond Volume (Simplified)
Ref: MSMA 2nd Edition (2012), Chapter 7 (Detention Pond) + Ch 2 Eq. 2.3 (Rational)
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V_s = (Q_post − PSD) × t_d × 60
Ref: MSMA 2nd Edition (2012), Chapter 7 (Detention Pond) + Ch 2 Eq. 2.3 (Rational)
Q_pre = C_pre × i × A / 360
Pre-development peak flow
Q_post = C_post × i × A / 360
Post-development peak flow
Try several storm durations to find the critical duration that gives the maximum required storage volume.
Catchment Data
Total contributing catchment area
MSMA Table 2.5 — e.g. 0.30 forest, 0.40 grass cover (major)
MSMA Table 2.5 — e.g. 0.90 terrace house (major), 0.95 commercial
Storm Parameters
From IDF curve for design ARI (typically 100-yr for major system)
Try several durations to find critical (maximum storage) case
Outflow Control (Optional)
Optional — leave blank to use pre-development Q as PSD
Disclaimer: This output is an engineering calculation aid only and does not constitute a final or endorsed design. All designs submitted to Malaysian authorities must be endorsed by a registered Professional Engineer (PE) under the Board of Engineers Malaysia (BEM) in accordance with the Registration of Engineers Act 1967.