Table 3 Failure rate models of precipitation brackets.
From: Assessment of the impacts of climat change on water supply system pipe failures
Material | Age | \(\alpha\) | \(\beta\) | \(\sigma\) | RMSE |
|---|---|---|---|---|---|
Cast Iron | 0–25 | 0.00593 | −0.0253 | 0.072 | 0.010 |
25–50 | 0.00235 | −0.0214 | 0.082 | 0.002 | |
50–75 | 0.00075 | −0.0100 | 0.063 | 0.002 | |
75–100 | 0.00092 | −0.0128 | 0.071 | 0.005 | |
Ductile Iron | 0–25 | 0.00138 | −0.0143 | 0.067 | 0.003 |
25–50 | −0.00032 | −0.0075 | 0.075 | 0.007 | |
Unknown | 0–25 | 0.0046 | −0.0392 | 0.122 | 0.006 |
25–50 | 0.0024 | −0.0224 | 0.086 | 0.003 | |
50–75 | 0.0032 | −0.0328 | 0.126 | 0.006 | |
75–100 | 0.0012 | −0.0159 | 0.094 | 0.003 |
