Requirements: Volume

Table 7: The Holliday-Segar method to calculate normal fluid volume requirements

Volume of fluid (ml) /(kg body weight) per hour
Up to 10 kg	4 mls/kg
From 10 - 20 kg	2 mls/kg
In excess of 20 kg	1 ml/kg for every kg after

Holliday-Segar method i.e. 70 kg person, see table 7.

$$\begin{eqnarray*} 10\: kg\: @ 4\: mls/kg & = & 40\: ml/hr \\ 10\: kg @ 2\: mls/kg & = & 20\: ml/hr \\ 50\: kg @ 1\: ml/kg & = & 50\: ml/hr \\ \end{eqnarray*}$$

Thus the hourly requirement is $40\: ml + 20\: ml + 50\: ml = 110\: ml/hour$

An alternative formula for adults is 35 ml/kg/day

Thus for a 70 kg person $70 \times 35 = 2450\: ml$ which is a rate of 102 ml/hr.