Step 1: Pan Evaporation Calculation
The pond evaporation (\(E_{\text{pond}}\)) is determined by the formula:
\[
E_{\text{pond}} = E_{\text{pan}} \times \text{Pan Coefficient}
\]
Given:
- \(E_{\text{pan}} = 45 \, \text{mm}\) (pan evaporation)
- Pan coefficient = 0.70
Step 2: Value Substitution
Applying the values to the formula yields:
\[
E_{\text{pond}} = 45 \times 0.70 = 31.5 \, \text{mm}
\]
Step 3: Final Result
The calculated evaporation from the pond is 31.5 mm, corresponding to option (3).
Final Answer:
\[
\boxed{31.5 \, \text{mm}}
\]