Requirements: Volume

Volume of fluid (water)/kg/24 hours
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

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

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.