pub fn calculate_ch4_slippage_sludge_storage(
sewage_gas_produced: Qubicmeters,
methane_fraction: Percent,
sludge_storage_containers_factor: Option<Percent>
) -> Tons
pub fn calculate_ch4_slippage_sludge_storage(
sewage_gas_produced: Qubicmeters,
methane_fraction: Percent,
sludge_storage_containers_factor: Option<Percent>
) -> Tons