Watch SoakMonkey size a soakaway

17-second demo · silent screencast, captions included · the free soakaway calculator

Load a worked example — percolation test results, drained area, rainfall — and read the BRE Digest 365 soakaway size straight off the screen, storm table included.

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What happens in the video, second by second

The clip has no narration, so here is the whole thing written out — the same text is on the video as a caption track. Every figure below is what is actually on screen at that moment.

  1. 00:00 SoakMonkey, BRE Digest 365. SoakMonkey opens — the free soakaway calculator, working to BRE Digest 365.
  2. 00:02 Load a worked example. The “Example” button in the toolbar is used to start from a worked example.
  3. 00:04 A full calculation in one tap. One tap fills a whole BRE 365 soakaway calculation: a rear extension for “Example Client”, reference EC-DEMO-SOAK.
  4. 00:06 Three percolation tests to a design infiltration rate. Section 3, the percolation test: a trial pit 2.4 m long by 0.6 m wide with 1.5 m effective storage depth, and three 75%-to-25% drain times of 14, 17 and 15 minutes giving f = 2.16, 1.78 and 2.02 × 10⁻⁴ m/s. The tool adopts the lowest, f = 1.78 × 10⁻⁴ m/s, per BRE 365.
  5. 00:09 Drained area and rainfall. Section 2, drained area and rainfall: 42 m² of impermeable area, England & Wales, rainfall ratio r = 0.39, M5-60 = 20 mm, a 1-in-10-year return period and a 40% climate change uplift.
  6. 00:11 Result: 0.54 m³ storage — DESIGN OK. The result bar answers instantly: 0.54 m³ of storage required, half-empty time 11 minutes — DESIGN OK.
  7. 00:13 The soakaway dimensioned. Section 4 dimensions the soakaway itself: modular crate, 0.54 m³, 0.29 m width.
  8. 00:14 End card. Closing card — SoakMonkey, the free BRE 365 soakaway calculator.

What you're seeing

Seventeen seconds from percolation figures to a dimensioned soakaway. Free in the browser; the Building Control-ready PDF is £25 +VAT when you need it.

Full detail — method, standards, pricing and FAQs — is on the SoakMonkey page.

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SoakMonkey works exactly like the clip — free in your browser, no account. Open it and try your own numbers.

Size a soakaway — free or call 01202 623236