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The equation of a parabolic arch of span $$l$$ and rise h, is given by

$${\text{y}} = \frac{{\text{h}}}{{{l^2}}} \times \left( {1 - {\text{x}}} \right)$$ $${\text{y}} = \frac{{2{\text{h}}}}{{{l^2}}} \times \left( {1 - {\text{x}}} \right)$$ $${\text{y}} = \frac{{3{\text{h}}}}{{{l^2}}} \times \left( {1 - {\text{x}}} \right)$$ $${\text{y}} = \frac{{4{\text{h}}}}{{{l^2}}} \times \left( {1 - {\text{x}}} \right)$$

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