rain.js

function You(param) {
  if (param == 1) {
    height = 30.48*document.running.heightf.value + 2.54*document.running.heighti.value
    document.running.heightm.value = height
    shoulder = 2.54*document.running.shoulderi.value
    document.running.shoulderm.value = shoulder
    chest = 2.54*document.running.chesti.value
    document.running.chestm.value = chest
  }
  if (param == 2) {
    height = document.running.heightm.value
    heightf = Math.floor(height/30.48)
    heighti = (height - heightf*30.48)/2.54
    document.running.heightf.value = heightf
    document.running.heighti.value = heighti
    shoulder = document.running.shoulderm.value
    document.running.shoulderi.value = shoulder/2.54
    chest = document.running.chestm.value
    document.running.chesti.value = chest/2.54
  }
  topside = chest*shoulder
  document.running.topside.value = Math.floor(topside)
  side = height*chest
  document.running.side.value = Math.floor(side)
  front = height*shoulder
  document.running.front.value = Math.floor(front)
}

function Rain() {
  rainspeed = document.running.rainspeed.value
  anglef = document.running.anglef.value
  angles = document.running.angles.value
  frontspeed = rainspeed*Math.tan(anglef*3.14159/180)
  sidespeed = rainspeed*Math.tan(angles*3.14159/180)
  windspeed = Math.sqrt(frontspeed*frontspeed + sidespeed*sidespeed)
  document.running.windspeedm.value = windspeed
  document.running.windspeedk.value = windspeed*3.6
  document.running.windspeedmiles.value = windspeed*3.6/1.609
}

function YourSpeed() {
  yourspeed = document.running.yourspeed.value
  distance = document.running.distance.value
  document.running.timetaken.value = distance/yourspeed
}

function Calculate() {
  height = document.running.heightm.value
  shoulder = document.running.shoulderm.value
  chest = document.running.chestm.value
  topside = chest*shoulder
  side = height*chest
  front = height*shoulder

  rainspeed = document.running.rainspeed.value
  anglef = document.running.anglef.value
  angles = document.running.angles.value
  frontspeed = rainspeed*Math.tan(anglef*3.14159/180)
  sidespeed = rainspeed*Math.tan(angles*3.14159/180)
  yourspeed = document.running.yourspeed.value
  effspeed = yourspeed*1 + frontspeed
  distance = document.running.distance.value
  time = distance/yourspeed
  amount = document.running.amount.value / (10*3600)

  tflux = amount   			// since units are ml=cm^3 and areas are in cm^2
  fflux = tflux * effspeed/rainspeed
  sflux = tflux * sidespeed/rainspeed
  toptotal = tflux * topside * time
  sidetotal = sflux * side * time
  fronttotal = Math.abs(fflux * front * time)
  document.running.fromfront.value = fronttotal
  document.running.fromside.value = sidetotal
  document.running.fromtop.value = toptotal
  document.running.intotal.value = toptotal + sidetotal + fronttotal

}