Oliguria or hypouresis (both names from roots meaning not enough urine) is the low output of urine. In humans, it is clinically classified as an output more than 80 ml/day but less than 400ml/day.
The alternative is to take US Dollars with you, and then change your money in Colombia, but if you do want to take cash then it's probably easiest to just buy Colombian pesos in the UK and take them. The alternative is to rely on using your bank card to withdraw money in Colombia. There is a decent network of cash machines in Colombia and they take most UK bank cards so there shouldn't be a problem with this, but many people do prefer to take a pre-paid currency card instead.
[Back to top]. The Canadian Dollar is the currency of Canada while the US Dollar is the currency of the Unitd States. As of June 2007, the exchange rate was around 0.95 Canadian Dollars for every American Dollar. Around Niagara Falls, many Canadian stores accept American Dollars but return change in Canadian Dollars. However, the converse is not true as American stores will generally not accept Canadian currency. If you can help it, the easiest thing to do is to use your credit card.