<p>dear editor,<br /><br />I expect to submit my long document to you sometime tomorrow. In the meantime, can you quickly check the following sentences (it's just very brief one paragraph) soon?<br /><br />Look forward to hearing from you soon.<br /><br /></p>
<p>1. Derive a model to predict DO downstream over time and answer to the following two questions.<br /><br />2. Determine the critical distance downstream at which DO is a minimum<br /><br />3. Calculate the minimum DO at the critical time in DO sag curve<br /><br />Assumptions:<br />- Initial BOD of a river: 25 mg/L<br />- Initial oxygen deficit: 2 mg/L<br />- Deoxygenation rate coefficient K: 0.4/day<br />- Reaeration rate coefficient, K<sub><span style="font-size: small;">2</span></sub>: 0.7/day&nbsp;&nbsp;<br />-&nbsp;Flow rate of a river: 20 miles/day<br />- Concentration of saturated DO: 10 mg/L</p>
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