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diff --git a/Fluid_Mechanics_by_John_F_Douglas/Chapter_15.ipynb b/Fluid_Mechanics_by_John_F_Douglas/Chapter_15.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:4f421cc7413696fe7c281427d95aff4b53c3ab081abe9cd6d31d1e2df1133e5a"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "    Chapter 15: Uniform Flows in Open Channels"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 15.1, Page 516"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "import math\n",
+      "\n",
+      "\n",
+      " #Initializing  the  variables\n",
+      "B  =4;\n",
+      "D  =  1.2;\n",
+      "C  =  7.6;\n",
+      "n  =  0.025;\n",
+      "s  =  1/1800;\n",
+      "\n",
+      " #Calculations\n",
+      "W  =  B  +  2*1.5*D;\n",
+      "A  =  D*(B+C)/2;                                                #  Area  of  parallelogram  formed\n",
+      "P  =  B  +2*1.2*(D**2+(1.5)**2)**0.5;\n",
+      "m  =A/P;\n",
+      "i=s;\n",
+      "C  =  (23+0.00155/i+1/n)/(1+(23+0.00155/i)*n/(m)**0.5);         #  By  Kutter  formula\n",
+      "Q1  =  C*A*(m*i)**0.5;\n",
+      "Q2  =  A*(1/n)*m**(2/3)*(i)**0.5;\n",
+      "\n",
+      "print \"Q using Chezy formula with C determined from the Kutter formula (m^3/s) :\",round(Q1,2)\n",
+      "print \"Q using the Manning formula                                     (m^3/s) :\",round(Q2,2)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Q using Chezy formula with C determined from the Kutter formula (m^3/s) : 5.65\n",
+        "Q using the Manning formula                                     (m^3/s) : 5.69\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 15.2, Page 518"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "import math\n",
+      "\n",
+      " #Initializing  the  variables\n",
+      "Q  =  0.5;\n",
+      "C  =  80;\n",
+      "i  =  1/2000;\n",
+      "\n",
+      " #Calculations\n",
+      "\n",
+      "# A = D**2+(3/4)*D**2 = (7/4)*D**2\n",
+      "D = ((4/7)*(Q/C)*(2/i)**0.5)**(2/5)\n",
+      "\n",
+      "#Result\n",
+      "print \"Optimum depth = Optimum Width (in metres):\",round(D,3)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Optimum depth = Optimum Width (in metres): 0.552\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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