Road Design

29/08/2026

ROAD SPEED BREAKER CALCULATION

📐 Standard Dimensions:
• Height (H) = 75 mm
• Top Width (W) = 600 mm
• Slope = 1:10
• Total Length (L) = 2.1 m

🧮 Length Formula:
L = 2(10H) + W

L = 2(10 × 0.075) + 0.6
L = 2.1 m

📊 Design Check:
For V = 40 km/h, the calculated height ≈ 78 mm.
A 75 mm height may be adopted where permitted by the applicable road standard.

⚠️ Key Points:
✔ Proper warning signs
✔ Reflective markings
✔ Good night visibility
✔ Adequate drainage
✔ Follow local road authority standards



Credit to Engineering of Things

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Filter Law / Criteria for Drainage

ရွှံ့လို cohesive soil ထဲကိုရေဝင်တဲ့အခါ ဝန်အားရုပ်တရက်သက်ရောက်မှုကြောင့် excess pore water pressure (larger then hydro static pressure) ဖြစ်ပေါ်လာပြီး နီးစပ်ရာ structure အစိတ်အပိုင်းတွေကို တွန်းလှဲပစ်နိုင်ပါတယ်၊
ဒါကြောင့် သဲဆန်တဲ့မြေ (granular soil) ကို အဆောက်အဦ အစိတ်အပိုင်းတွေမှာ ဖြည့်မြေအဖြစ်သုံးရပါတယ်။
အကြောင်းအမျိုးမျိုးကြောင့် ရေဝင်လာရင်ထွက်နိုင်ဘို့ ရေထုတ်စံနစ် (drainage system) ကိုသုံးပြီးရေထုတ်ရပါတယ်။
မြေကြီးထဲကရေကို ထုတ်ဖို့လိုအပ်လာရင်၊ မြေကြီးတွေတိုက်စားပြီး ရေထဲပါမသွားဘို့ ကာကွယ်ရပါမယ်။
Filter law ဟာ ရေထဲကို မြေကြီးတိုက်စားပြီးပါမသွာဘဲ ရေစီးကောင်းဘို့ လိုအပ်တဲ့ အခြေအနေတွေပါ။
လေ့လာကြည့်ပြီး အသုံးချပါ၊

☘. Fundamental Filter Criteria (Granular Filters)

Based on classic principles ( ), filters must meet specific gradation requirements relative to the soil they protect.

☛ Retention Criterion (Preventing Piping):

The filter must have small enough pores to retain the base soil. A common rule is:

D15F ≤ 5 × D85B

(Where D15F is the 15% passing size of the filter, and D85B is the 85% passing size of the base soil).

☛ Permeability Criterion (Allowing Free Drainage):

The filter must be porous enough to allow water to pass without building pressure.

D15F ≥ 5 × D15B

(Where D15F is the 15% passing size of the filter, and D15B is the 15% passing size of the base soil).

☛ Uniformity:
The gradation curve of the filter material should be roughly parallel to that of the base soil to prevent particle movement.

☛ Maximum Size:
The filter material should not be too coarse; a common maximum is

D50F ≤ 25 × D50B

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