import streamlit as st
import math

# App title
st.title("Pipe Size Suggestion Tool")

# Input fields
flow_rate = st.number_input("Enter the flow rate (m³/s):", min_value=0.0, value=0.0, step=0.01)
velocity = st.number_input("Enter the permissible velocity (m/s):", min_value=0.1, value=1.0, step=0.1)

# Calculate pipe diameter
if flow_rate > 0 and velocity > 0:
    diameter = math.sqrt((4 * flow_rate) / (math.pi * velocity))
    diameter_mm = diameter * 1000  # Convert to mm for readability
    st.success(f"Recommended Pipe Diameter: {diameter_mm:.2f} mm")
else:
    st.warning("Please enter valid flow rate and velocity values greater than zero.")