“See, too, the jolly courser, with his groom, Expert, not like to him who _Persia’s_ crown Obtained, yet skill’d with upright crest and arm, Compacted knee, to give the rein and bitt Their motion due, his flight retarding not. ---- Next _Faubert_ view with graces of menage, And troops of horse in strictest motion wheel.”
From the heights of Hampstead spring several small streams, such as the Fleet, the Brent, and the West Bourne, probably so called to distinguish it from St. Mary le bourne, which was further east. Roque’s map shows its position with regard to the Serpentine, but, before that misnamed lake was made, it ran right through the Park from north to south, leaving the Park about Albert Gate, where was a bridge, from which Knightsbridge takes its name. Then it flowed by what are now William Street, Lowndes Square, and Chesham Street, falling into the Thames near Ranelagh.
Queen Caroline, wife to George II., conceived the idea of utilizing this little stream, and making it into a lake, and, as it was supposed that she was
expending her own money on this work, no objection was raised to her so doing, but it is said that at her death she left the King to pay a sum of no less than £20,000 on account of it. We learn when it was commenced from _Read’s Weekly Journal, or British Gazetteer_, Saturday, September 26th, 1730. “Next Monday, they begin upon the Serpentine River, and Royal Mansion in Hide-Park: Mr. Ripley is to build the House, and Mr. Jepherson to make the River under the Directions of Charles Withers, Esq^{ re}.” This latter gentleman, who was Surveyor General of Woods and Forests, died shortly before the Serpentine was finished, probably in 1733, when his successor was appointed; and in May, 1731, it was deep enough, in part, to allow two small yachts upon it. Its cost was estimated at £6000--but a portion of that (£2500) had to go as compensation to the Chelsea Water Works Company, who held a 99 years’ lease, granted to one Thomas Haines, in 1663, whereby, on annual payment of 6_s._ 8_d._, he had command of all the springs and conduits in the Park.
The water supply for the Serpentine came from the Westbourne, until, in the course of time, owing to the extension of building, the houses around draining into it, its water became too foul for the purpose, and, in 1834, it was cut off, and connected with the sewer in the Bayswater Road; and the supply thus lost is made good by the Chelsea Water Works, who pump in water at the Kensington Gardens end, and the overflow at the very pretty Dell forms a striking feature in the landscape gardening of the Park. Formerly, as we see in Roque’s map, the overflow was conducted into a pool, which was bridged over by the King’s Old Road.